Maximum Fuel Injector Pulse Width

The fueling strategy for NGC requires potentially three fuel pulses per cylinder per cycle. Example: You have an injector that has a maximum recommended operating pressure of 100psi (6. In Open Loop operation, this would mean the AFR will be lower than intended. 5psi? What is the lowest base fuel if we have plenty of fuel injector assuming lower fuel pressure requires greater injector pulse width? When would I want to increase base fuel pressure?. 1msec total pulse width to dispense the right amount of fuel at idle, of which 0. Replace the stock fuel injectors for your modified HEMI engine with High performance injectors designed for 700 HP and up. What prevents many tuners from diagnosing the the problem of poor power production caused by variances in fuel injector fuel delivery rates, is the use of O2 sensors on dynamometers, and "tuning to an A/F Ratio" schemes, as promoted by "sellers" and "marketers" of dynamometer equipment. how long the ECU sends the ground signal to the injector. This duration or period is referred to as the injector pulse width. Every vehicle has minimum and maximum fuel trim percentage parameters programmed into the PCM. 7msec is the offset correction at 13 volt, resulting in an effective pulse width of 0. Fuel injector cleaning can bring your injectors back to original factory specs. The DVOM in this example is. A pulse width is the time in milliseconds the injectors is ON (fired). The result is vastly superior cylinder to cylinder consistency, even at very low pulse widths. injector duty cycle 6. Pintel style has the slowest rate as they have more mass to move. electronic fuel injector tester): The GTC605 does not require the fuel injector to be disconnected or removed, saving time and effort; It tests the fuel injector under real operating conditions, which include the ECM/ECU and fuel pump. Throttle body fuel injection, while similar to a carburetor, has a separate throttle body with one fuel injector rather than fuel injectors located in each cylinder. BPW = Base Pulse Width the pulse width commanded to injectors under steady state engine conditions. Pilot Fuel Qty vs. Based upon a manifold vacuum signal, pressure regulator maintains a constant fuel pressure in fuel system of approximately 31-39 psi (2. -I have a jumper harness to bypass the haltech ecu when i need to get an inspection (plus swap injectors). DeatschWerks 1200cc Top Feed Low Impedance Fuel Injectors Set of 6 DeatschWerks is an American-based company that is dedicated to fueling your passion for performance. Since the balance rates are how much the injector adjusts fuel amount to even out the idle, that would be done via differing pulse widths. Trinity PID list Page INJ PW Injector Pulse Width mS VOL FUEL DES Desired Volume Fuel mm^3 MASS FUEL DES Mass Fuel Desired mG MAN ABS PRES Manifold Absolute Pressure KPA MAN GAUGE PRES Manifold Gauge Pressure KPA MaxFuelCal The calibrated maximum fueling that the system may output. The car has very, very low hours (less than 5), and the problem seems to have been slowly getting worse. This opens the injector up and generally takes about 1 millisecond. Test the fuel injector return flow, refer to Fuel Injector Diagnosis. Before I replaced the front section of the fuel line it would actually fire up and die immediately because the line kept popping off the rail because the quick disconnect was messed up. 3800 PCM Operation. Electrical 89 no injector pulse and fuel pump constantly running: Fox 5. Fuel Injector Cleaner Pulse Generator BOX: This is my machine pulse generator to clean injectors, made in low budget, using Arduino and some parts. With grouped injection, one cylinder gets the injection pulse right before the intake valve opens, the other cylinder gets the injection pulse about 180 degrees before the intake valve opens. This injector is a larger version of the HEUI used on the Ford 6. This calculator is intended to help people generate a reasonably close idle pulsewidth value for DIY fuel injection systems. Each injector is activated independently by the engine control module (ECM). Henrietta Rd. This adjustment is called fuel trim and can be read using a scan tool. The two items are used in conjunction to provide the motive force for your car: throttle body lets in the air, the fuel injectors let in the fuel. A typical pulse width is 2 to 4 milliseconds at idle and as high as 15 to 18 milliseconds at wide-open throttle. Because the Multec fuel injectors sit higher in the intake manifold the tips stay clean enough that pouring in an injector cleaner in the fuel tank should keep them in good shape. Normally, fuel injectors are sized by cubic centimeters per minute of fuel able to flow through them. With this process. 00 and several hours trouble shooting. This is called the pulse width, and it is controlled by the ECU. The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. The engine's powertrain control module (PCM) fi res the injectors in a specific sequence and maintains - through constant adjustment of the injector pulse width (the length of time the injector is open) - an ideal air/fuel ratio of 14. The Fuel Injector Set by Fuel Injector Clinic can be installed by anyone with medium mechanical skill. Gently pull out the fuel injectors to detach them from the pump. Here are two TBI injectors. In 2008, the most commonly asked question that I have heard about the LT5 is: “What do I need to know about replacing the fuel injectors?” A close second common inquiry is a description of this scenario: “The engine runs okay when started cold, but the smoothness deteriorates as the engine warms. 96 MPa (24,650 psi) and delivers fuel to the fuel rails through 2 high pressure lines, 1 per bank. Because the injector is essentially a gate valve for fuel delivery, increasing fuel pressure can allow you to cram more fuel into the intake tract for a given injector pulse width. Here are a few measurements of how the clutch switch affects the fuel injector pulse width on the 2nd gen (fuel injected) SV650. If the injector ground circuit is turned on the fuel is sprayed at the back of the intake valve. Plus the M. 35 ms, and the voltage at the end of the hold pulse is very, very low. After the peak flow of amperage, this circuit shuts off and the hold circuit is engaged to keep the injector open for the duration of the pulse width. Injector Pulse Width Average Bank 1; Injector Pulse Width Average Bank 2; Injector Pulse Width Bank 1; Injector Pulse Width Bank 2; Injector PWM Average Bank 1. (ms/pulse) Saturated Turns on 100% for the entire duration of the injector Pulse Width and is used with High impediance coils. This is called multi-port fuel injection. • Maximum injection pressure increased from 23,000 psi (1,585. I have a problem I can't figure out. how long the ECU sends the ground signal to the injector. Have spark-compression-good fuel injector-power to injector, but no injection pulse to this injector. No injector pulse. This method is somewhat crude and does not provide a reliable tune for changing ambient conditions like temperature, altitude, engine load, fuel, etc. SPX OTC Fuel Injection Pulse Tester is designed to check cylinder balance by firing individual injectors. Injectors are switched on and off by the ECU, and are controlled using a technique called Pulse Width Modulation. “The magic of this 1100cc injector is in the latest fuel injector technology, which makes it a very linear injector,” said Jens von Holten, head guy at Fuel Injector Clinic. Fuel from fuel pump enters fuel rail, injectors and pressure regulator. Pulse width modulation allows fuel supplied to the engine to be precisely controlled electronically. This is called the pulse width, and it is controlled by the ECU. Here is a picture showing the noid light plugged into the injector connector when checking injector pulse a 2002 Ford Taurus. When the signal swings above 450mv, the ECM commands the fuel injector pulse to be shorter and this will lean the mixture. 3 Powerstroke Injectors. I have a problem I can't figure out. Low Cost tester, cleaner. Electrical 89 no injector pulse and fuel pump constantly running: Fox 5. The current to open the injector, signaled from Pin 21, is both the injector open/close and the injector's pulse width. 5ms pulse width and 10ms repetition rate @ 58. In Open Loop operation, this would mean the AFR will be lower than intended. The accepted maximum duty cycle is 90% of the maximum so you need to multiply the the result above by 0. Fuel delivery adjustments to the injector pulse width based on closed loop feedback. This injector is a larger version of the HEUI used on the Ford 6. 2006 ltr 450 fuel injection/starting problems Now the tempature light is blinkning which in the book says that there is a serious fuel injection problem. Measuring Pulse Width On a Port Fuel Injector. A 70 percent duty cycle means that the injector is open 70 percent of the injector's maximum cycling time. What does the injector response time (IRT) allow DDEC electronics to do when managing EUI pulse width? Technician B says that one timing actuator. The injector on-time, that is, the period of time the injector remains open to allow the fuel to be injected. A winding can short out, overheat or break. Injector Flow Data. It is found in many places on modern engines and equipment. 7msec is the offset correction at 13 volt, resulting in an effective pulse width of 0. Single flash of noid light at beginning of cranking, then nothing. ⇓ If the fuel injectors test normal 13. All New Generation Bosch EV14 fuel injectors will function at rail pressures in excess of 101 PSI, 7 bar. If i am wrong please let me know. So, 322cc divided by 5 = 64hp maximum fuel flow with this injector. output devices: injector pulse width (ms), fuel pump relay (2 sec prime pulse), emission control devices: egr, diverter, tcc lockup, timing spark advance/retard typical fuel pressure: 58-62 psi (very sensitive to slight low pressures) • port fuel injection (pfi) _____. The signal is required by the PCM for making fine adjustments to the fuel injection timing and the fuel injection quantity. tech a says a fuel injector pulsed flow test measure steady or maximum fuel flow with the injector pintle and nozzle held fully open. new crank sensor. In Open Loop operation, this would mean the AFR will be lower than intended. LS1 Fuel Injector scaling for changing injectors. The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. "Simply put, Duty Cycle is just a measurement of how long an injector stays opened, to supply the required volume of fuel to an engine, in comparison to the total amount of time available for that event to happen. Does not require a restrictive mass air flow sensor that must be calibrated to different injector sizes. Posted: 2013-12-07 Last Updated: 2020-04-19 Injector Flow Data Select your injectors from the drop down menu below. Injector pulse width should be equal to the amount of fuel flow desired multiplied by the flow rate, plus injector latency. Some spray patterns are good for economy. Other sensors in the loop will modify this slightly, but ideally, the air/fuel ratio will be close to 14. Up until the discovery of these compensation tables, the most common technique used by tuners to wrangle in higher flowing injectors was somewhat rudimentary and didn't work very well for streetcars. The unit injection system integrates the injection pump and nozzle into a single module. P029A: Cylinder 1 - Fuel Trim at Max Limit. Injector Calculation. This calculator will generate pulsewidth values for specific rpms, from idle to peak speeds. Base fuel schedule is the theoretical pulse width that the ECU would have to run in order to maintain a 14. Four injector types were evaluated, some of which were modified through the employment of solid lubricant coatings and surface treatments—creating a total of eight candidate H 2 injector variants. The PCM responds by adding a certain % of fuel; let’s say 5%. Running several buzz tests cold will sometimes free up the injectors. You are correct - you cannot accurately flow test an injector if the filter is not in place. Put the ECM pulse output through a resistor divider. Always start with the basics. M14 350 bar baseline [%] 5 10 15 0 0. This test is fast, easy, safe and I have found it to be very reliable. 96 MPa (24,650 psi) and delivers fuel to the fuel rails through 2 high pressure lines, 1 per bank. Base fuel schedule is the theoretical pulse width that the ECU would have to run in order to maintain a 14. High-pressure fuel is supplied to the fuel injector by the fuel pump. Each map location contains fuel-injector pulse width and ignition-advance data for a certain set of sensor parameters. Electronic fuel injection, as its name implies, is a means to controlling injector timing and pulse width (time period the injector is open and delivering fuel) as a means to controlling engine. Fuel pressure and leak-down must be tested with the engine off. 5Hz to 57Hz N/A Missing Injector event Variable Frequency and Duty N/A 0% to 100% 0Hz to. of injectors. My question is what would the expected maximum injection pulse that this or a similar system might show at full load, in this case at approx 3400rpm we get a maximum engine load of 54% and max injection pulse of 7. The faceplate is made of polished aluminum. [FIXED] Long cranking injector pulse width (60-80ms) was created by Jake No codes, no odd sensor readings, just too much fuel while cranking for some reason. Pulse width is the time in milliseconds that the injector is energized, the duty cycle is the percentage of on-time to total cycle time. OBD codes related to Fuel Injector Replacement. Performance is not for penny pinchers. Heated Oxygen Sensors • The Heated Oxygen Sensor (HO2S, formerly known as HEGO), shown in Figure 10, is located in the exhaust manifold and monitors the oxygen content. Injectors should not be pulsed beyond an 85% duty cycle. Have an assistant crank or start the engine. Calculates injector size requirement and open time (pulse width). ) # of Cylinders Fuel Pressure (psi) Injector full flow value (size) in CC/Min Engine Aspiration Naturally Aspirated Supercharged Turbocharged Duty Cycle 80% 85% 90% 95% 100% Fuel Used Gasoline E85. In Open Loop operation, this would mean the AFR will be lower than intended. But like I said, it depends on your rail pressure differential, the specific fuel injectors you have installed, and the BSFC of your engine/exhaust. Controlled tests demonstrated 56% and 39% improvement in mileage in gasoline and diesel vehicles respectively. So, what happens when you install injectors with higher flow rate? Without changing anything in the ECU, the same pulse width would be calculated from the MAF readings but the fuel delivered would be more than before. 1msec total pulse width to dispense the right amount of fuel at idle, of which 0. The duration that the injector is open (called the pulse width) is proportional to the amount of fuel delivered. China Fuel Injector Cleaner / Analyzer (GBL-6B), Find details about China Fuel Injector Cleaner, Fuel Injector Analyzer from Fuel Injector Cleaner / Analyzer (GBL-6B) - Greens Auto-Overhaul Equipment Factory. See all 41 photos We chose to make our own sensor mount using a piece of fuel. Increasing spark advance at idle increased fuel efficiency/MPG (by requiring less pulsewidth from the injectors, and less airflow through the MAF sensor), and also lowered engine temperature. SPX OTC Fuel Injection Pulse Tester is designed to check cylinder balance by firing individual injectors. It depends a lot the injector body to nozzle ratio. The extra displacement resulted in a modest bump in horsepower and just over 20 extra lb-ft of torque. The dealer says I should have the fuel injectors cleaned on my 2011 f-150 ecoboost 3. Everything Peter said about the timing of the fuel injection pulse is correct, in my opinion, the ideal timing for an injection pulse will be such that the end of said pulse will coenside with the closing of the intake valve, of course you already knew that im sure. This is because the injector must be fired and the fuel delivered before a certain point in time. But have you ever stopped to think about how the fuel gets from the fuel tank into your engine? Take our quiz to find out how much you know about fuel injection systems. This base pulse width is what the ECU uses for all fuel calculations. Some fuel should come out of the opening. Actuator is a device that performs work in response to an electronic signal. The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. When pulse width times get very low, the injector doesn’t fully open and. When the VAF is flowing at the maximum rated flow, the EEC sends the maximum value from the table. The GM ECU-specific short pulse width compensation and minimum IPW data for Fuel Injector Clinic’s 2,150 cc/min injector, formatted for HP Tuners. Can be machined to fit most imports. Minimum injection time is calculated by subtracting the dead time at 14v from the minimum pulse width. Dirty fuel injectors rob your engine and vehicle of power, performance and fuel economy. 4 non turbo, automatic. Because of this 12 volts/12 ohm circuitry, the injectors will draw 1 amp (12volts divided by 12 ohms). The injectors operate linearly with pulse width as small as 1. For example: An injector that flows 330 cc @ 40 psi will flow 369 cc @ 50 psi. Find MSD Atomic EFI Throttle Body Systems 2900 and get Free Shipping on Orders Over $99 at Summit Racing! These MSD Atomic EFI fuel injection systems are the perfect choice for anyone planning on converting from carburetor to fuel injection. The brake fuel consumption assumes a naturally aspirated engine, the amount of fuel it takes to create 1 hp. If you change injectors or make changes in the engine, you can program the system to take advantage of the changes through the user friendly SDS. For example, if the programmed injector pulse-width at a given RPM is only capable of reaching a 65% duty cycle, that is the maximum duty cycle you can get. Fuel Injector Pulse width In Relation To RPM May 29-30th 2020 event at Rosedale Tech has been moved to April 30-May 1, 2021 (29 Apr 2020) Full refunds will be given unless you want us to hold your spot for next year. Fuel Flow Calculator. This means that if the pulse width is 5ms and the opening time is 1ms, the injection pulse will start 3ms before the injection timing point and end 2ms after. Fuel Flow Calculator. Fuel injector cleaning and flow testing. Complete blueprinting service for injectors Injector Clean and Flow Test $ 18. As DeGrace-Bata (1985) say, linearity is usually expressed in terms of the lowest pulse width or fuel flow at which Flow vs. The first is pulse width, or the amount of time that the injector is open. Send measurements to the PCM so that it can maintain the A/F at a desired 14. injector, ECM: P1270: Maximum engine RPM or vehicle speed limit reached Fuel control - pulse width in range. The system pressure generated by the high pressure fuel injection pump is constantly adjusted by the powertrain control module (PCM) for every operational condition. DIY Tuning Solutions provides simple electronics for end-users to develop their own tuning solution. 1msec total pulse width to dispense the right amount of fuel at idle, of which 0. Replace the G18 High Pressure Fuel Pump. or you know that i am wrong either way i am sure you will not hesitate to say so. ) # of Cylinders Fuel Pressure (psi) Injector full flow value (size) in CC/Min Engine Aspiration Naturally Aspirated Supercharged Turbocharged Duty Cycle 80% 85% 90% 95% 100% Fuel Used Gasoline E85. please I need help. MAP/BARO, O2, MASS AIR FLOW SENSOR NUMBERS, IAT, ECT, TPS and TROUBLE CODES. 9) The following chart provides maximum horsepower levels based on injector size and various BSFC values. In direct fuel injection, the fuel is sprayed directly into the cylinder whereas in the indirect injection, the fuel is sprayed into the intake manifold. 8 psi) 866 cc/min – 4. 7 fuel injector. This is why the Tuning Module is fuel efficient. 3L having a marginally larger cylinder bore. But like I said, it depends on your rail pressure differential, the specific fuel injectors you have installed, and the BSFC of your engine/exhaust. 216 nozzles to reduce the smoke until it’s hazy. Problems can include a bad injector pump, the Fuel Solenoid Driver module (FSD) that sits on the injector pump. Lean / Rich knob allows +/- 50% change in pulse width to aid in quick tuning adjustments. Buy 94-97 Powerstroke Injectors or. These quick sprays give the PCM an advantage. When it comes to injector duty cycle or pulse width though a diesel engine uses direct injection where the available time to inject fuel is much shorter than the full engine cycle time. The faceplate is made of polished aluminum. How to avoid staying too rich at idle: Minimum Injector Pulse. (This should not be confused with duty cycle , which is the ratio of how long the signal is active compared to how long. This is called the pulse width , and it is controlled by the ECU. Just something for your friend, and perhaps you, to think about: at 4000 RPM, with a 4000 uS pulse width, your injectors are now open for a total of 96 crank angle degrees. Hello to all I need help! I have 2005 nissan maxima SE 3. We learn what the core injector data tables represent and how to properly program them. My question is, how are the fuel injectors cleaned and is it something I. Just replaced fuel pump and filter. The computer tells the injector how much fuel to spray by telling it how long to stay open. 7 to 1 at 200F (93C). The extra displacement resulted in a modest bump in horsepower and just over 20 extra lb-ft of torque. Base Injector Timing Injector Timing MAF/Baro Select: Selects either MAF or Baro based Injection Timing. Each map location contains fuel-injector pulse width and ignition-advance data for a certain set of sensor parameters. Pulse Width (PW) The time, measured in ms, that the injectors are programmed to deliver fuel for a single injection event. Fuel pressure plays a big role in the operation of a fuel injection system. For this experiment a fuel injector for 125cc Honda motorcycle was tested. There's a point in the fuel delivery curve (the breakpoint) where the slope changes. Load is added to the engine to maintain small to medium throttle openings at lower RPMs. As seen in FIG. 4L equipped car, pick up or SUV. What mechanical feature defines the limits within which EUI fuel pulse width (PW) must take place? injector cam profile. Ideally, the injection on-time corresponds to the length of time between the time the injector signal starts to rise from zero value and the moment it starts to fall from the steady. Superior short pulse width control and state of the art matching make these injectors easy to tune and provide great drivability. Fuel injectors are the bridge between a full tank of gas, and your engine utilizing that gas. The pressurized fuel is next supplied to the fuel rail. Pulse width is the time in milliseconds that the injector is open, while duty cycle is the injector's overall percentage of open time. Based on information taken from the MAF sensor and engine Coolant Temperature Sensor (CTS), the computer determines the pulse width of the fuel injectors. The pulse width (~6us) seemed a little short for a mechanical device. Uses that MPa value to lookup (with interpolation) the injection pulse width in. The measured Pulse Width is around 14m/sec max, whereas the required Pulse Width if the Effective Pressure was still 70psi, is around 9-10m/sec for a typical target AFR. a fixed injector pulse width and an open loop control strategy. Q: We have a ‘97 Chevy Astro van in the shop that wouldn’t start. Once the electrical test is done they are pressurized and checked for leaks. It is apparent that at the velocity of 2600, at the beginning of spray process, in the exhaust stroke, the mass ratio of vapor increases. The longer the pulse, the longer the injector stays open and the more fuel is injected. The duration that the valve is open- and consequently the amount of fuel sent into the cylinder- depends on the pulse width (i. 5 Turbo Diesel with trouble code 36(injection pulse width error-response time long). This is known as pulse width modula-tion (PWM) and is measured in milliseconds. Other sensors in the loop will modify this slightly, but ideally, the air/fuel ratio will be close to 14. 7, I have good fuel pressure and good spark but I am only getting 0. Exergy 40-60% Over Injectors: Injectors with 40-60% increase are great for guys with a moderate turbo upgrade. This is called multi-port fuel injection. PowerTip injector is a direct replacement for all standard injectors and are compatible with all aftermarket E. ), as you increase the fuel pressure, the amount of fuel which passes through the injector increases. The industry standard base fuel pressure is 43. Assuming a "normal" fuel density, the mass of the fuel in pounds per hour can be worked out by Dividing the cc per minute figure by 10. I have a 2000 durango with a 5. The fuel pulse may be modified by the ECM/PCM to account for special operating conditions, such as cranking, cold starting, altitude, acceleration, and deceleration. 5Hz to 57Hz N/A Missing Injector event Variable Frequency and Duty N/A 0% to 100% 0Hz to. Injector pulse width is the length of time the injector is open. Your calculations all look ok as far as the mass air flow and fuel flow go but remember that this assumes 100% VE which is unlikely. The accepted maximum duty cycle is 90% of the maximum so you need to multiply the the result above by 0. This method is somewhat crude and does not provide a reliable tune for changing ambient conditions like temperature, altitude, engine load, fuel, etc. Duty cycle or pulse period - As rpm increase, an injector can only be held open for so long before it needs to be held open again for the next engine revolution - this is called its "duty cycle. We always recommend replacing all 4 in a matched set, so you do not wind up with fuel injectors of different flow rates on the same engine. Contribute to RomRaider/SubaruDefs development by creating an account on GitHub. Excellent low pulse width response with predictable, lightening-fast response. As the throttle valve rotates in response to movement of the accelerator pedal the throttle shaft transfers this rotation movement to the TPS. Part Number: gpG2-0750-0802 Description: Fuel Injector Kit; Set of 4 Size: 750cc Notes: Fits Only 90-95 Toyota MR2 (SW20) Details: ; Grams Performance is proud to offer the most innovative high-performance fuel injectors for today's performance vehicl. What is the specs on the injectors for the internal resistance?. ) # of Cylinders Fuel Pressure (psi) Injector full flow value (size) in CC/Min Engine Aspiration Naturally Aspirated Supercharged Turbocharged Duty Cycle 80% 85% 90% 95% 100% Fuel Used Gasoline E85. Fuel Pressure Modification. I find it difficult to believe that a large mechanical relay (or fuel injector) can actually work with a pulse in the us range. injector duty cycle 6. The ECU supplies 12 volts to the injectors and the ECU turns this 12 volts on and off to establish a fuel injector pulse. known as the injector “pulse width” and is measured in milliseconds. The amount of fuel delivered, measured in mm 3, will rise accordingly. 0 MPa - Up to 1. The firing order on the PSD is 1-2-7-3-4-5-6-8, and all injectors are controlled by the PCM which drives the IDM to fire the injectors. Can fine-tune the non-acceleration air/fuel curves using the Bluetooth® app; Can tune engine fuel delivery in specific ranges, check rpm, read fuel injector pulse width and duty cycle, and add or remove fuel in low- or mid-range rpm; Fitment: Scout Sixty (2017 - Current) Scout (2015 - Current) Octane (2015 - Current). Fuel Pressure Modification. We only stock low impedance injectors. Voltage, Gear with TCL, ICP Pressure, Injector Pulse Width, Intake Air Temp, Mass Air Flow, Mileage Coach, MPG Instant, MPG Average, TCC Duty Cycle, Time 0-60, Time 1/4 mile, Trans Temp, Turbo Boost, Vehicle Speed (04-07), Variable Geometry Turbo Duty Cycle. Injector pulse width is the amount of time, measured in milliseconds (ms), that a fuel injector stays open (delivers fuel) during a cylinder intake cycle. 40 ms, too short for the injector to fire. 65, with the latter value arising from the fuel enrichment necessary to keep exhaust temperatures below 1650 deg F and catalyst temperatures below 1750. Example of duty cycle. The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. So, what the ECU is essentially doing is collecting information and determining how long the injector needs to be open. Built-in Tuition Guidance. This tester fires individual injectors in 1/2-second increments in three different ranges which are 1 pulse of 500 milliseconds, 50 pulses of 10 milliseconds, 100 pulses of 5 milliseconds. ** Maximum Injector Duty Cycle should be around 80% max for safe operation. MoTec M800 maximum 'Fuel actual pulse width' was 15. We know that RPM / 2 = cycles per minute. Steps to check the injector coil. The time the injector is actually energized during the period is called the pulse width (PW). The first is pulse width, or the amount of time that the injector is open. To achieve stoichiometry, the air mass flow into the engine is measured and combined with the fact that the stoichiometric air/fuel ratio is 14. This flow rate is sized by the requirements that at idle, the injector should meter the fuel accurately (thus the lower the flow rate the better, since the corresponding pulse width will be longer and the. Injector Flow Data. EASY to use PC software allows all fuel and ignition changes to be programmed in 'real-time'. The time the injector is on is often called duration or pulse width, and. Direct insertion into stock fuel rail/throttle body. Pilot Fuel Qty vs. This is required by my CMR tuner. StangNet's favorite TOOL. Measuring Pulse Width On a Port Fuel Injector. The peak pulse is much shorter than normal, about. Fuel pressure and leak-down must be tested with the engine off. If you have the latest style injectors the minimum pulse width is much lower on them giving the injector more "bandwidth". I have checked the fuses for the EEC and I know I am getting fuel all the way up to the injectors and the fuel pump is working. bargraphs for air/fuel and pulse width as well as the pot to control the fuel mixture above 7psi boost. 0 Mustang Tech: 9: Mar 4, 2018: T: 91. Superior short pulse width control and state of the art matching make these injectors easy to tune and provide great drivability. Common rail diesel fuel injection system with pressure control valve located on the rail (Source: Bosch) The electromagnetic force increases with the time-average of the coil exciting current that is controlled by a pulse width modulation strategy. 001 to get ms). 3,500cc+ total injection is now here! Injector Low Pulse Width Compensation Use comprehensive manufacturer data to take low load fuel tuning to another level!. SPX OTC Fuel Injection Pulse Tester is designed to check cylinder balance by firing individual injectors. The inputs the PCM uses are what you want to look at. Simply connect the power leads to a 12 volt car battery, hook up the injector, select the pulse width, and press the button. to enter these values for my ID1000's in my 2011 STi and I was able to enter them all exactly with the exception of the Fuel Injector Trim (Small IPW) table. 65, with the latter value arising from the fuel enrichment necessary to keep exhaust temperatures below 1650 deg F and catalyst temperatures below 1750. 3L having a marginally larger cylinder bore. The amount of fuel supplied depends on how long the fuel injector stays open. The computer tells the injector how much fuel to spray by telling it how long to stay open. These injectors are able to function at high fuel pressures and don’t exhibit the high fuel pressure handling problems found with many other high flow high-impedance injectors. • Fuel pressure @ Idle – 2-3 psi (Minimum – 1 psi). Pulse width is the duration (time interval) that the injector stays open. The fuel injectors will. 0 Mustang Tech: 9: Mar 26, 2018: W: No Injector Pulse, Out Of Ideas. Injector pulse width should be equal to the amount of fuel flow desired multiplied by the flow rate, plus injector latency. The first pulse is delivered starting at a programmed angle soon after the intake valve closes, for specified time duration. Some fuel should come out of the opening. Electronic fuel injection, as its name implies, is a means to controlling injector timing and pulse width (time period the injector is open and delivering fuel) as a means to controlling engine. It "trims" the mixture by adjusting the injector pulse width. GO FAST WITH TILLOTSON TCT MECHANICAL FUEL INJECTION. Injector Accessories. Used in our Harley Turbo Kits and in big inch motors. Instead of adjusting the fuel pressure for each individual injector event. This test will tell you if the computer is pulsing the fuel injectors open when cranking the engine over. to enter these values for my ID1000's in my 2011 STi and I was able to enter them all exactly with the exception of the Fuel Injector Trim (Small IPW) table. 7 milliseconds. Service Area. If you have the latest style injectors the minimum pulse width is much lower on them giving the injector more "bandwidth". Get it repaired in a city near you. When the signal swings above 450mv, the ECM commands the fuel injector pulse to be shorter and this will lean the mixture. Bypass circuit is a circuit, usually temporary, used. The car has very, very low hours (less than 5), and the problem seems to have been slowly getting worse. To begin, set the -40°F cranking pulse width to about 88% of your "upper" req_fuel value, and the 170°F cranking pulse width to about 23% of your req_fuel. Lean / Rich knob allows +/- 50% change in pulse width to aid in quick tuning adjustments. Injector duty cycles should not exceed 85% at peak horsepower. This is NOT the actual injector pulse width. The average reading, for each fuel injector, should be about 11-18 Ohms. This is getting close to the minimum pulse width this large injector. Turn off the vehicle, remove the electrical connector of the injector you want to check; Put the digital multimeter to a right value on the Ohms scale according to the resistance specs for your fuel injector (usually, you need to set the multimeter to read at least up to 30 Ohms). Everyone knows that you put fuel into the tank to keep the car running. 4Liter Powerstroke • Power Level 1 - 25 HP & 55 lb-ft. Fuel Injector Clinic injectors are set up to and. It depends a lot the injector body to nozzle ratio. The injector will be open all the time, but the pulse width can still be calculated. Trinity PID list Page INJ PW Injector Pulse Width mS VOL FUEL DES Desired Volume Fuel mm^3 MASS FUEL DES Mass Fuel Desired mG MAN ABS PRES Manifold Absolute Pressure KPA MAN GAUGE PRES Manifold Gauge Pressure KPA MaxFuelCal The calibrated maximum fueling that the system may output. The ECU will increase the injector pulse width based on the AFR target, fuel trims, other run time variable parameters, and environmental conditions. Another technical term used in fuel injection is injection duration — this is the time period when fuel from the injector enters the combustion area of the engine. 5psi (3Bar) at 90ºF fuel temperature using CF-16B calibration fluid. Includes pigtails PGTJETR8 or add Plug & Play adaptors PADPJtoU8. A pulse width is the time in milliseconds the injectors is ON (fired). fuel keeps being delivered after the logic pulse ends) I say it's "not as important" because most ECU's now have so much control authority than they can adjust (lengthen or shorten) the pulse width being commanded of the injector by a large amount, and the effective duration of injection is sort of lost in the noise, as long as it's not. injector pulse width increases on PFI vehicles with saturated injectors, the on time starts sooner rather than the injector starting at the same point Figure 6a and staying open longer (See figure 5). The duration that the injector is open (called the pulse width) is proportional to the amount of fuel delivered. Gasoline Race Gas E85. -Also if it becomes clogged or greatly restricted with varnish deposits it will fail to deliver the normal dose of fuel when the coil is energized. The fuel supply rail bungs for the top of the injectors are the same size. hammer the pump to greatly reduce fuel delivery to my new. Fuel flow is directly related to pulse width. The pressurized fuel is next supplied to the fuel rail. 0 Mustang Tech: 9: Mar 26, 2018: W: No Injector Pulse, Out Of Ideas. Replace the stock fuel injectors for your modified HEMI engine with High performance injectors designed for 700 HP and up. Instead of adjusting the fuel pressure for each individual injector event. 7, I have good fuel pressure and good spark but I am only getting 0. But surprisingly, there is no camshaft position sensor. Fuel injectors are available with a variety of spray patterns for different applications. The 1990 Subaru Justy was the last car sold in the United States to have a carburetor the following model. First, fuel pressure is important to modulate fuel injector pulse width. • Typical fuel injection "pulse width"--the amount of time the fuel injector is delivering fuel--is between one and fifteen milliseconds, depending on what the PCM commands. One method to accomplish this is called the pulse width modulated (PWM) circuit. The total time in which the injector is spraying fuel is called Injector Pulse Width. If a longer-than-normal injector pulse width is required to maintain the desired ­oxygen sensor signal, the ECM/PCM displays an ­increased fuel trim value in its datastream. 2 211-3025: Injector Gp-Fuel. The X Axis is the actual pulse width applied to the injector in milliseconds, and the Y axis is the volumetric flow, in microliters, for a single pulse. It is found in many places on modern engines and equipment. wherein the asynchronous fuel injection pulse width T IS at the time k is determined by the following expression: ##EQU10## where: T p (k-1) is a basic injection pulse width calculated at the tim k-1, a is a flow area when a throttle valve is fully closed, b is an area of the throttle valve, θ (k-1) is a throttle angle at the time k-1, and. P029D: Cylinder 1 - Injector Leaking. Testing Ripple Voltage On an Alternator. The air/fuel (O2) monitor, pulse width monitor, and fuel controller are all on one. If it starts, the relay is probably flaky. 5psi? What is the lowest base fuel if we have plenty of fuel injector assuming lower fuel pressure requires greater injector pulse width? When would I want to increase base fuel pressure?. Fuel pressure plays a big role in the operation of a fuel injection system. Q: We have a ‘97 Chevy Astro van in the shop that wouldn’t start. Your calculations all look ok as far as the mass air flow and fuel flow go but remember that this assumes 100% VE which is unlikely. fuel keeps being delivered after the logic pulse ends) I say it's "not as important" because most ECU's now have so much control authority than they can adjust (lengthen or shorten) the pulse width being commanded of the injector by a large amount, and the effective duration of injection is sort of lost in the noise, as long as it's not. The amount of fuel delivered depends on the injector flow rating (pounds per hour or cc per minute), the length of time the injector is open (pulse width) and the fuel pressure. Although on the CSFI ‘Spider’ type, you've got 6 or 8 separate fuel injectors, you are still able to test each one with the Fuel Injector Pulse Tester. I noticed that there was also mention of 4500 RPMthat same pulse width at 4500 now makes the injector-on degrees 108 at 4000uS. The firing order on the PSD is 1-2-7-3-4-5-6-8, and all injectors are controlled by the PCM which drives the IDM to fire the injectors. Fuel Injector Clinic injectors are set up to and. Jim Grant's Tech Tips ‘97 Chevy Astro, No Injector Pulse. The LTFT and STFT are added together, so a LTFT of 10% and a STFT of -5% will equal 5%. The fuel computer drives the fuel pump through pulse width modulation (PWM), and monitors the pressure with a sensor. bargraphs for air/fuel and pulse width as well as the pot to control the fuel mixture above 7psi boost. 2 used to be hooked up and ran fine. Cold fuel is more dense than hot fuel. The EEC doesn't look up ' injector on time', it , minimum injector pulse width accelerator pump multiplier open loop fuel multiplier part throttle timing , ) startup fuel (A:F ratio) base fuel (A:F ratio) injector timing (crank degrees) injector firing order , Position sensor EGR Valve Regulator Fuel Injector or Fuel Injection Fuel Pump Fuel. Problems can include a bad injector pump, the Fuel Solenoid Driver module (FSD) that sits on the injector pump. The PCM then checks the Engine Coolant temperature (ECT) sensor and the Throttle Position. I systems out of the box, no injector driver adapters needed. Hold the rail vertically over something to catch some fuel (a medium tupperware container works very well, especially the kind Hillshire Farms lunch meat comes in) and remove the bottom injector. By increasing and reducing the Injector Pulse Width, the PCM can satisfy two important functions: 1. Part Number: gpG2-0750-0802 Description: Fuel Injector Kit; Set of 4 Size: 750cc Notes: Fits Only 90-95 Toyota MR2 (SW20) Details: ; Grams Performance is proud to offer the most innovative high-performance fuel injectors for today's performance vehicl. While users can opt to set only basic parameters if they choose, other more specific parameters—like injector pulse width, shot volume, progressive injector firing, and minimum/maximum RPM range—are all alterable, making the system extremely versatile. Fuel injector pulsewidth calculator. The results of this particular test, with injector No. For example, a 2150cc injector may need a 1. I mentioned using a Basic Stamp, and was envisioning something along these lines. fuel keeps being delivered after the logic pulse ends) I say it's "not as important" because most ECU's now have so much control authority than they can adjust (lengthen or shorten) the pulse width being commanded of the injector by a large amount, and the effective duration of injection is sort of lost in the noise, as long as it's not. Fuel delivery adjustments to the injector pulse width based on closed loop feedback. The pulse width is determined by the tables in the EEC. There is one injection pulse per power cycle. The high pressure fuel injection pump increases the fuel pressure up to 169. The switch allows either the primary or secondary injector pulse to be monitored. The signal is required by the PCM for making fine adjustments to the fuel injection timing and the fuel injection quantity. Injector pulse width and duration during various operating conditions are handled by the PCM, not you. There are two cases for a TDC, first, just before the intake stroke, and second, just after the compression stroke. RPM to Hertz. That's called the injector pulse width. That's pretty darn close to ground so if I take cursor one and put it there, and cursor two and put it at the end of that ground period, that's going to give us our injector pulse width; 2. Of course, accurate …. These injectors flow 80 lbs/hr at 43. You can set the flex fuel sensor parameters in MegaTune under 'Settings/Flex Fuel':. Voltage: 12 volts; Pulse: rectangular; Mode: single, continuous; Pulse width modes: 250ms, 8ms, 4ms and. What does the injector response time (IRT) allow DDEC electronics to do when managing EUI pulse width? Technician B says that one timing actuator. The FPR mainly controls the amount of fuel bypassed back to the tank in order to maintain desired injector feed pressure - idle speeds, max bypass. This means, on a single injector engine, the maximum injector pulse duration is 17ms. I noticed that there was also mention of 4500 RPMthat same pulse width at 4500 now makes the injector-on degrees 108 at 4000uS. The injector requires rocker arm actuation of the plunger to create high fuel pressure for injection. Replaced crank positioning sensor and computer. The amount of fuel supplied to the engine is determined by the amount of time the fuel injector stays open. 0068997 which is (24. 7 to 1 (stoichiometric) ratio. value times K value = BFS. how long the ECU sends the ground signal to the injector. I mentioned using a Basic Stamp, and was envisioning something along these lines. I am sure there may be few "magic" numbers. 5 4] Pulse Width[ms] M16 - 600 bar M16 - 350 bar M14 - 350 bar 0% 50% 100% 150% M14 350 bar M16 350 bar M16 600 bar ECU Energy vs. 3L IDI is based on the 6. General Glow Plugs(Diesel Engines) Glow Plug Timer - Start: The amount of time the glow plugs will be on when the ignition is on but the engine is not running. The system pressure generated by the high pressure fuel injection pump is constantly adjusted by the powertrain control module (PCM) for every operational condition. 5Hz to 57Hz N/A Missing Injector event Injector Double spike 2. Each unit retains OEM duty cycle and pulse width ensuring reliable performance. Will turn over and try to crank but the injectors aren't pulsing. Pressure across the injector at which the test was performed. Turbocharged engines will want to be at. Get it repaired in a city near you. 0PSI (400KPa) up to 10 injectors though I have been successful at. Injector Accessories. The numbers entered into the cells on the map represent the injector on time in milliseconds. The fuel delivery system consists of an electric fuel pump, fuel filters, fuel pressure regulator an fuel injectors. So, what happens when you install injectors with higher flow rate? Without changing anything in the ECU, the same pulse width would be calculated from the MAF readings but the fuel delivered would be more than before. Each map location contains fuel-injector pulse width and ignition-advance data for a certain set of sensor parameters. The brake fuel consumption assumes a naturally aspirated engine, the amount of fuel it takes to create 1 hp. If it can't open, it can't deliver fuel. Complete blueprinting service for injectors Injector Clean and Flow Test $ 18. Just before and during the opening of the intake valve, an electrical pulse. This is called the pulse width, and it is controlled by the ECU. Because the Multec fuel injectors sit higher in the intake manifold the tips stay clean enough that pouring in an injector cleaner in the fuel tank should keep them in good shape. The minimum injection time is also important to make sure the injection pattern is clear and complete. Find out how fuel-injection systems work and about the various configurations used in the cars today. Fuel Injectors The port injector used in this study is a Nippondenso pintle- type injector which is used in Nissan products (see Figure 1). An electronic fuel injector (gas or diesel) is the most common use of a PWM circuit, but it is not the only one. All fuel injectors have separate grounds at the ECM. SELECT YOUR VEHICLE. Injectors are size-rated by pounds per hour (lb/hr) of flow and maximum fuel pressure. Lean / Rich knob allows +/- 50% change in pulse width to aid in quick tuning adjustments. I need to measure pulse width (not time between two pulses, but length of one single pulse - from raising to falling) on fuel injector - it is driven by simple square pulse on ground wire (positive wire is allways attached to battery's +). Fuel System At Rich Adaptive Limit At Idle, System Lean (1. Single flash of noid light at beginning of cranking, then nothing. Electronic fuel injection, as its name implies, is a means to controlling injector timing and pulse width (time period the injector is open and delivering fuel) as a means to controlling engine. The most efficient ra. the injector pulse width, and a negative long term fuel trim is indicated. This is called multi-port fuel injection. PowerTip injector is a direct replacement for all standard injectors and are compatible with all aftermarket E. Figure 1 shows the relationship of PW to PI. Injector deposits can build in diesel engines due to a lack of injector detergency specification for diesel fuels. jaguarfuelinjectorservice. This maximizes the performance of the engine's stock settings by precisely controlling when then fuel injection begins, as well as the duration of the fuel spray (pulse width). The constants used are 1. Some fuel injection is mechanical, while more modern systems are. 5 psi and is sufficient even for most V8s engines. 7,665 608 113. The signal is required by the PCM for making fine adjustments to the fuel injection timing and the fuel injection quantity. A winding can short out, overheat or break. 5psi? What is the lowest base fuel if we have plenty of fuel injector assuming lower fuel pressure requires greater injector pulse width? When would I want to increase base fuel pressure?. It is simply the amount of time, measured in milliseconds (ms), a fuel injector stays open (delivers fuel) during a cylinder intake cycle. EV14, 2200cc fuel injector data: Stainless steel internal parts are compatible with all fuel types; Individual dynamic testing at multiple pulse-widths; Sets are Flow Balanced and Matched to within 1. Basic System Operation Air enters the engine through the air induction system where it is measured by the air flow meter. 0068997 which is (24. 5psi (3Bar) at 90 degrees F fuel temperature using CF-16B calibration fluid. The ECU will increase the injector pulse width based on the AFR target, fuel trims, other run time variable parameters, and environmental conditions. (This should not be confused with duty cycle , which is the ratio of how long the signal is active compared to how long. Henrietta Rd. Second, fuel pressure readings are used to modulate the fuel pressure regulator, which the ECM controls depending on driver demand and engine loading conditions. Pulse width or pulse time - "The length of time an injector is open and squirting fuel is called the "pulse width" and measured in milliseconds (ms). Check with your injector builder on where he thinks the maximum duty cycle is for you specific injectors. injector size in lbs. The measured Pulse Width is around 14m/sec max, whereas the required Pulse Width if the Effective Pressure was still 70psi, is around 9-10m/sec for a typical target AFR. So, what the ECU is essentially doing is collecting information and determining how long the injector needs to be open. Injectors that are too large for your application, won't idle well due to low pulse-width operation. The FRP sensor is located on the fuel rail and provides a feedback signal to indicate the fuel rail pressure to the Powertrain Control Module ( PCM ). Minimum injection time is calculated by subtracting the dead time at 14v from the minimum pulse width. So that means 100cc per ms. PWM is used to control voltage (and consequently current) to fuel injectors. “The magic of this 1100cc injector is in the latest fuel injector technology, which makes it a very linear injector,” said Jens von Holten, head guy at Fuel Injector Clinic. On average most race tunes that I have run use between 2. SPX OTC Fuel Injection Pulse Tester is designed to check cylinder balance by firing individual injectors. The pulse width of fuel injector is increased as engine RPM s also increase. 0ltr petrol This has an early fuel multi-point injection system, it is full group injection. So it basically starts and the fuel pulse width decays, from the Cranking Fuel values, down to the minimum pulse width value. BLM value affects the VE table by adding fuel above 128 and subtracting fuel below 128. Considering practical injection rate shape’s variation, in this research, five different injection rate shapes were selected to investigate the effects. It does this by converting data beginning with the RPM. BPC = Base Pulse Constant is a term that is calculated from the volume of one cylinder, the flow rate of one injector,. 89 gmc 4x4 2500 sub. Under load the fuel injection is amazing, it just keeps on pulling. Fires an injector several times with a normal pulse width to check pintle response. Gen III - Speed Density VE Table and MAF Tuning Instructions with a Wideband O2 Sensor Create by 69lt1bird – Jeff Anderson 2 system is operating rich, long term fuel trim will compensate for the rich condition by decreasing the injector pulse width, and a negative long term fuel trim is indicated. The industry standard base fuel pressure is 43. While users can opt to set only basic parameters if they choose, other more specific parameters—like injector pulse width, shot volume, progressive injector firing, and minimum/maximum RPM range—are all alterable, making the system extremely versatile. com - 7 - www. jim747 · Registered. 2 used to be hooked up and ran fine. The fuel injectors vary according to the pulse duration and duty cycle. As shown in Figure 5, among the five different injection rate shapes, the total fuel amount, pulse width, and average injection rate are maintained the same. The required fuel mass that must be injected into the engine is then translated to the required pulse width for the fuel injector. Under load the fuel injection is amazing, it just keeps on pulling. Fuel Injector Size Calculator (Other Fuel Injector Calculators have been moved to individual pages, check out the list HERE it's near the bottom of the page) To use the Fuel Injector Size tool to select the correct size injector for your engine, fill out the above form with the specified data. If you're thinking about bypassing the clutch switch on your 2nd gen SV, take a look. And, because programmers and tuners for these engine model years only modify injector pulse width and timing, they can be used in addition to the BD High Performance VP44. Injectors should not be pulsed beyond an 85% duty cycle. Fuel injectors are the bridge between a full tank of gas, and your engine utilizing that gas. Ideally, the injection on-time corresponds to the length of time between the time the injector signal starts to rise from zero value and the moment it starts to fall from the steady. Check with your injector builder on where he thinks the maximum duty cycle is for you specific injectors. If injector pulse width is too great, and throttle angle increases too suddenly, you will trigger fuel cut. Holley EFI 160lb/hr Flow Matched Fuel Injectors feature a precision lapped disc valve, high-quality brass windings, and high-temp O-rings. The module increases the injector pulse width (or length of time the injector sprays) based on fuel pressure change in the fuel rail. 3L is a high compression. • Maximum injection pressure increased from 23,000 psi (1,585. wherein the asynchronous fuel injection pulse width T IS at the time k is determined by the following expression: ##EQU10## where: T p (k-1) is a basic injection pulse width calculated at the tim k-1, a is a flow area when a throttle valve is fully closed, b is an area of the throttle valve, θ (k-1) is a throttle angle at the time k-1, and. The manifold injector bungs are 0. Most other systems are called “post-fuel devices” and are basically signal modifiers that adjust spark and/or fuel injector pulse widths. The faceplate is made of polished aluminum. 7 TBI conversion 1978 Mustang II King Cobra Road Racer - Holley 650, MSD 6AL, 5 speed, 10 point Roll Cage, 9" posi, fuel cell, custom interior. The ratio of water to fuel was simply determined by the difference of injector sizes. Every injector has a minimum pulse width. 85) So, at 5k rpm we have 20. Short Pulse Limit: Injector Pulses shorter than this will be increased by the amount specified in Short Pulse Adder. Rust can cause it to stick. When the injector is initially turned on, a current flow of about 4 amps is passed through the injector. Excellent fuel atomization for modern multi-valve engines. known as the injector "pulse width" and is measured in milliseconds. Maximum injector duty cycle (IDC) (In order to be conservative, Fuel Injector Clinic recommends a maximum duty cycle of 90%. That's pretty darn close to ground so if I take cursor one and put it there, and cursor two and put it at the end of that ground period, that's going to give us our injector pulse width; 2. StangNet's favorite TOOL. Keywords: diesel engine, diesel fuel injection system, simulation Abstract The injection process of a medium-speed diesel engine was studied in detail, using a computer program developed for this purpose. There is no exact pulse width that will work perfect for every truck and injector combo. The constants used are 160 CFM per 100 HP, and an 85% duty cycle for maximum injector pulsewidth. FiTech Fuel Injection has been supplying automotive products, specifically fuel injection products, since 2012. Maximum duty cycle was 61% at 4,800 rpm. Cranking should be between. Sean, Wayne is correct, I used a relay to cut the power to the injectors. Use the Maps pull down to access the fuel map tables. As the throttle valve rotates in response to movement of the accelerator pedal the throttle shaft transfers this rotation movement to the TPS. Pulse width is probably a variation of balance rates. M14 350 bar baseline [%] 5 10 15 0 0. The injectors operate linearly with pulse width as small as 1. HP x BSFC) / (number of injectors x duty cycle) We’ll use a stock, early-model Ford 5. This allows for some future horsepower increases. It is apparent that at the velocity of 2600, at the beginning of spray process, in the exhaust stroke, the mass ratio of vapor increases. of injectors. -Also if it becomes clogged or greatly restricted with varnish deposits it will fail to deliver the normal dose of fuel when the coil is energized. This allows a certain amount of fuel to be injected at any given time. Once it gets up to 5700 rpms and speed exceeds 60 mph it starts leaning out, like 13-14 on the AFR. The PCM uses variations in fuel injector pulse width modulation to effect air/fuel ratio changes. 0 Mustang Tech: 13: Feb 2, 2019: F: Electrical No Injector pulse: Fox 5.