Will it be a problem that high is 12V ? If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page. Continue with Recommended Cookies. Joined: Fri Apr 17, 2009 4:08 am. seconds to 13.23 (since (14.70 - 13.23) / 14.70 is 0.1). If you double your airflow entering the engine you need to double the fuel delivery at the same rate to maintain the same AFR level. Thread: Proper scaling and pulse width figures for GM Part # 24508208 injectors??? 4L80e w/shift kit, PY 3600, and 3.73 gears. Nonlinear fuel delivery simply means that if we expect the injector to deliver 40 cc/min at 1.0 ms (millisecond) pulse width, it should theoretically deliver something like 35 cc/min at 0.8 ms. Lastly, we learned that the larger the injector the lower the pulse width at the same engine rpm, load, and AFR. I always see 12V on the circuit even when the injector is firing. These panels are usually tightened using bolts and taken out using a basic socket set that includes an extension. The inputs are, in order of appearance: The number of cylinders in your engine, The BASE* fuel pressure you will run (your fuel pressure at idle), *our calculator assumes a 1:1 rising rate fuel pressure regulator for turbo applications So you're saying it will show low when the injector is fired? Oftentimes, I see flex fuel cars run poorly at idle and light throttle driving on the 93 octane portion of the tune, but run great on e85 because of the longer opening times. You're probably thinking,"What the hell does that mean?" 01:27: We started off with a measured airflow value, corrected it for air density to calculate mass flow, and finally calculated the injector pulse width we need to achieve our target air fuel ratio. Calculate injector flow when fuel pressure change . The "normal" MS3 code allows pulse widths up to 65 ms. You'll notice there is a "4X" mode to allow four times that pulse width. Once you follow these steps, you will be able to find out what the issue is exactly, but you should have in mind it is not a must for the malfunction to be caused by an electrical problem. Knowing that our fuel injector has a static flow rate of 10.2333 grams per second, we divide that into our fuel mass and arrive at a pulse width value of .0060304 seconds, or 6.0304 milliseconds. This makes for a miserable driving experience from a lean misfire. Integrated into your multimeter are two wires, a red test probe wire as well as black earth wire. COPYRIGHT 2019 EVANS TUNING ALL RIGHTS RESERVED. That same car will have a difficult time with idle quality and drivability compared to a car with a smaller injector like a 1000cc/min. From any of those calculators, you will be able to very quickly determine what cc/min size injector you will need to fuel your desired horsepower level. You can check them out below: From any of those calculators, you will be able to very quickly determine what cc/min size injector you will need to fuel your desired horsepower level. Injector calculators to match size to horsepower for gasoline, E85, E98, Methanol. At idle speed the throttle restricts the amount of air entering the engine, this lowers the pressure in the inlet manifold (higher manifold . E85 will require approximately 30-40% higher fuel flow capacity to achieve the same AFR level as gasoline. Above, we learned that the on board computer sends a pulse to the injector to command it to be opened or closed. Therefore, regardless of whether you are planning to test injector resistance or injector wiring, you can now go ahead and do the test as expected and be able to make the correct diagnosis. Calc new flow when fuel pressure change. Variations such as Natural Aspirated, Turbo or supercharged, or specific type of gasoline, can be used. "Fuel load" is converted to a pulse needed to inject correct amount of fuel. 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. You should note that the fuel injector size vs horsepower will drastically change based on the fuel being used. and damage can result. While that is partially true, a tuner's job while tuning your car is working with the parts that you have installed on your car. How Pulse Width Is Determined Will it work with incorrect data? This limit is active except during higher RPM/load/throttle initial lift-throttle (tip-out) conditions. All values here are meant for the standard fuel pressure of 3.5 bars (50.76 psi). Fuel Injector Calculators. Monitor and record the fuel trim values in the four common operating rangesidle speed, light load (20 to 30 mph), moderate load (40 to 50 mph) and heavy load (60 to 70 mph). Moreover, the low impedance injectors located on the bigger and high-performance injectors, and usually produce much lower resistance of about two to five ohms. Some car engines cone integrated with plastic panels, which you should always remove before you even reach the fuel injectors. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. Injector Dynamics are our go-to injector brand because they have excellent accurate injector data available in all kinds of formats for different platforms including GM, Subaru, Ford and universal standalone applications, to name a few. The Injector Pulse Width is the amount of time the injector is open. The result is a far more accurate estimation, which allows you to pick the right injector the first time. What is injector data and why is it important? This makes it easy to calculate injector sizing based on fuel pressure. 1991 RCSB 2WD Sierra LQ4 swap, 220/224 112 cam, Twin VSR 6766 turbos. This calculator will do it for both 2 Stroke and 4 stroke engines. If the injector rating is in cc/min: There are 60000 ms in a min, so: fuel per squirt = (sprayTimeInMs / 60000 ) * flow rating. Yes. I checked my engine data stream and realized that my injection pulse width is around 3.3-3.5ms at idle. On some cars with very large injectors, you may find yourself having reduced the cranking pulse width to zero, and the engine is still acting like it has too much fuel. Cycle Time [sec] = 60 [sec/min] / (Engine Speed [Rev/Min] / 2). At this point, we are not flowing at a linear rate, which causes the fuel delivery to drastically drop off. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms. I already adjusted my fueling and timing but car still has those small issues. Fuel Flow Calculator. So, whenselecting a fuel injector, make sure you confirm that the manufacturer provides accurate injector data. Here is a simple calculator that will do that. Why does this matter? General Conversions. This engine start is a NSGS (not so good start, hehe), takes extra few revs to start. However, to do this, you might need to move a slide lock to be able to press down on the tabs that will allow you to take out the wiring harness. With that injector size we know that you should be looking at a quality injector manufacturer that can supply accurate and detailed injector data for you or your tuner when you tune. Are you talking about offsets or short pulse adders, if you zero out the offsets then im suprised the car actually ran well at all. But how does the fuel injector relate to horsepower and why does it really matter? . I have tuned some cars that were just plain horrible to idle and drive and the only way to correct the problem was to richen up the AFR mixture. While very simple, its vital to enter the correct data into our calibration file so at the most basic level the GM ecu can turn its calculated fuel mass into the correct injector pulse-width to achieve a desired AFR. That pre-programmed injector pulse will provide exactly one gram of fuel for each 14.64 grams of air (a stoichiometric air/fuel ratio), but the PCM almost always adjusts . This calculator will generate pulsewidth values for specific rpms, from idle to peak speeds. The Short Pulse Width Adder table is used to adjust the opening time of the injector in its non-linear operating zone. So this is the final result the ECU will calculate, and now we have an actual injector pulse width that can be sent to the injector. To maintain good combustion and torque/power production from a four-stroke gasoline engine you need to achieve the proper parts fuel to air flow entering the engine. However, need a couple of essential kits to help you during this test including; Before you can even start the test to check the injector pulse using a multimeter, you need to make sure you have everything in place. Connect an OBD II generic scan tool, preferably with recording capabilities. Perfectly normal. Reply Like # 4 04-04-2011, 02:53 PM BLADE35 Hotshot Some of our partners may process your data as a part of their legitimate business interest without asking for consent. your fuel per squirt will be in lbs. How HIGH ya wanna GO ? If Idle in Kilopascals (kpa): Then kpa / 3.3864 = In Hg Expected Peak Horsepower Millisecond (Ms) Injector minimum open time (1 to 1.25): Your Installed Injector size (lb/hr): Number of injections per cycle (batch 2, sequential 1): How many strokes per cycle (four stroke = 4): Results Injector Size @ 80% recommended duty cycle (lb/hr): 800 0.55. What does this mean in terms of horsepower? Every injector will have a point where it's "on the cliff." This can be a double edge sword because at idle and light throttle the larger injector will operate at or close to the nonlinear zone. Old Pressure. Let's say the engine speed is 2,000 RPM and load is 4. One way to simplify this process is to multiply IPW by 5.33, then divide RPM by that number. Injector vs horsepower calculator #3. The lower you run the injector in pulse width the greater chance it has to operate either "on the cliff" or in a nonlinear condition. study with quizlet and memorize flashcards containing terms like what directly controls the fuel injectors, what directly turns on the fuel pump reay, the longer the fuel injectors are held open the _____ amount of fuel is _____ into the engine and more. Fuel Injector Calculatoris probably the most detailed Fuel Injector sizing software available. By changing your fuel pressure, you can change the flow rates of your injectors. What are the two methods used to measure the amount of air entering the engine. [ IPW is the time the PCM connects an injector to ground to turn it on ] The duty cycle is the ratio of IPW to one cycle period; DC varies with IPW and RPM (typically from 3% to 85%); DC is expressed as percentage; one cycle period (in seconds) is as . Lets start by defining the various portions of the curve. You can enter numbers in the white boxes. Another important detail is that even on a smaller injector size like 900-1000cc/min, the quality of the injector internals and spray pattern both play a role in the linear response of the injector. Of course and it's not going to work. Now that you have a good foundation to size your fuel injector based on your engine, application, and fuel, what is the next important part of selecting a fuel injector? So, you're probably thinking,"Why do I care, my tuner will have to take care of it." After reading through this article, you now have an idea of how to check the injector pulse with a multimeter. Join the harness wires and, after that, have the red test probe wire inserted into the fuel injector solenoid, and then locate the kits acupuncture probe. It's unfortunate we can't just plug into the factory ECU to get the fuel flow values from there since they're constantly calculating grams of fuel per second and monitoring vehicle speed. From what I can find, these injectors flow 42lb on a 58psi rail, rated at 43.5 psi. So for our above example, the duty cycle would be 25%: 25ms PW / 100ms period = .25, or 25% Fuel Pump Calculator. 440 lbs/hr. Need to measure fuel injector pulse width for MPG calculator. Old Flow Rate. Count sounds great, hadnt heard of that command before. Don't know what kind of car your working on, I have done some of these things on GM cars. In this article, you will be taken through the steps you should follow to check the fuel injector pulse using a multimeter before you decide to make use of an injector cleaner. . ___. After that, wear both your goggles as well as gloves to safeguard yourself from any possible harm you might be prone to when doing this test. Once you have everything in place, you can now dive right into testing the injectors. A good starting point would be to calculate a multiplier based on (Factory Injector Flow / Aftermarket Injector Flow) and apply that to the IPW for each Base A-F . The injector offset value is added to the injector pulse width as the very last item before the total pulse width is sent to the hardware. SFI SYSTEM. Looking at the red trace below, which is the raw flow vs pulse width data from our injector, we can see that substantial error exists. As part of a larger project, I want to be able to measure the width of a fuel injector pulse, allong with the VSS (Vehicle Speed Sensor) to determine MPG. Since you are running stock tuning, 3 ms is about right.. depending on ICP pressures. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms. If you are runing over this it's time to look for a larger injector. Engine is 408 Cubic Inches pressure is 14.33 Temp is 70F or 529.67 AFR = 14.6 (408 * (3000/2)) / 1728 = Airflow 354.17 2.7 * (14.33/529.67) = Air Density 0.073 354.17 * 0.073 = Mass Air Flow 25.854 lb/min 25.854 / 6 cylinders = 4.309 lb/min 4.309 / 14.6 = Fuel Mass 0.295 lb/min 0.295 / 2.0 = Duty Cycle .1475 or 14.75% The reason is that the code is adding the injector dead time to the cranking pulse width, and if your dead time setting is high enough, it can be enough pulse width on its own . Additionally, half the total number of injectors is placed on either side of the motor. if your wideband is setup properly then it doesnt matter which method you choose. 22 PSI and E85, 4300# with driver. Sign Up For Our Newsletter To Keep Up To Date With Evans Tuning! According to our calculations, the turbocharged small-block Ford will require a minimum of at least 440 pounds of fuel per hour, and the all-motor LSX will need 360 pounds of fuel per hour. The relation of flow vs pulsewidth should be largely linear, aside from high load conditions where the fuel pressure is raised slightly, but those situations are hard for even the ECM to monitor. This nonlinear behavior can occur at light throttle driving as well, depending on the injector characteristics. Choose your fuel injectors wisely! Consequently, you will be able to have an injector that is always functioning correctly, and this translates to your car running at its best every time you are on the road. Yes engine load which basically depends on how much air is trapped in each cylinder at the start of the compression stroke. Save my name, email, and website in this browser for the next time I comment. a. The calculation for duty cycle is very simple; it's just the pulse width divided by the period, which gives the percentage of time that the coil is being energized, compared to the total time available before it has to be energized again. The BSFC is the key to understanding an engine's efficiency of fuel consumption with respect to horsepower. Fuel injector pulsewidth calculator It isn't as accurate as a fuel injection system, it uses flow instead of mass to generate the pulsewidth. Without your tuner having accurate injector data, the on-board computer will not know how to properly control the fuel injector, specifically in the idle and light throttle driving situations. New Pressure. a. Throttle body injection this injector is located above the throttle plate. Using "The tuning school" way of imputing the injector flow rate into the table, and dropping pulse width down to the .950 range I can't get this car to smooth out on the VE. Choosing the proper fuel injector size is critical for the successful use of an electronic fuel injection system whether it . Currently, there are 3 variants of electronic fuel injection systems: MPI, GDI, and SPI. Injector flow size - make sure you select cc/min or lb/hr in the drop down, (The amount of fuel you can supply your engine directly affects the amount of power that engine is capable of producing.) In almost all cases this is untrue. We and our partners use cookies to Store and/or access information on a device. GICU812 Posts: 289. The constants used are 160 CFM per 100 HP, and an 85% duty cycle for maximum injector pulsewidth. It works by estimating airflow based on a few known parameters, and then calculating fuel flow directly from exhaust lambda. This includes dirt as well as other debris getting into your eyes and consequently making it difficult for you to see, whereas glass ensures you never touch any of the devices directly. Application of fuel injection pulse width in automobile fault diagnosis (2) 2. Welcome to the Parallax Discussion Forums, sign-up to participate. If an injector is selected that is much larger than is needed, the injector pulse width . The BSFC in this case will jump around the same % in terms of fuel efficiency vs horsepower, so expect to use more fuel and size your fuel system accordingly! If a fuel injector is activated for 15 ms. at 3,000 RPM the duty cycle is 37.5% (15 ms. / 40 ms.). Awesome. And minimum pulse width is supposed to be .125ms, according to data. This would be 100% duty cycle. nearest size needed. Higher injector pulse width = more fuel injected = more power output. Oh well! The yellow box shows the result and is read-only. The injector dead time is also added to the pulse width calculation. . Then subtract the measured pulse width from the cycle time to get the "on" pulse width. The takeaway. It is possibly to calculate the maximum allowable pulse-width that an injector can be given in order to stay within an acceptable range of duty cycle for any given engine speed. Engine aspiration, {Turbocharged, Supercharged, and Naturally Aspirated engines have different BSFC's (see Glossary of Terms for definitions)} First, figure out the cycle time (the time for two revolutions of a 4-stroke engine). I have them zero'd out and i get a really bad surge on cold starts and on warm starts the car cranks longer to start. Consequently, press the trigger selection button and then move forward to press the multimeters negative meter. The consent submitted will only be used for data processing originating from this website. Having the correct injector data is key to making an engine run correctly with an EFI system. Well the car has a very accurate MPG display, so I planned to just calibrate it manually, just note a given MPG at a given speed and note the pulse width the stamp uses. You need to have a good understanding of the electronic fuel injection system so that you can easily recognize when there is no injector pulse. Therefore, you should take the subsequent steps if the resistance of the injector is normal to take out the injector and check the spray pattern, which is being produced on the injector tester. To do this, you need to open your cars hood and then try and locate the position of the fuel injectors. At 3000 psi of ICP, you can empty a stock injector in 3.5 ms. http://www.parallax.com/Portals/0/Downloads/docs/books/edu/ic.pdf, http://en.wikipedia.org/wiki/Electronic_fuel_injection. Injector Data!!! Re: Maximum Allowable Injector Pulsewidth. Any other ideas ? a. The problem is, the injector is always powered with the engine on, it is fired when the ECM grounds the other side of the injector. 9.7@138, 1.47 sixty. Naturally aspirated LSX: 800 0.45. The grey box will show you the injector duty cycle %. Not so ideal now, huh? . We learned how to calculate the injector size for the horsepower goal that we have. #1. This would create a lean condition and you will experience either a hunting idle if the oxygen sensor tries to correct the massive fueling dropORget a lean misfire that will cause the engine to run very choppy and unstable. 14.70 - 13.23 ) / 14.70 is 0.1 ) includes an extension adjusted my fueling timing... That we have s time to get the & quot ; pulse width is setup properly then it doesnt which. To pick the right injector the first time only be used for data processing originating from this.. To look for a miserable driving experience from a lean misfire does that mean? this browser the! 220/224 112 cam, Twin VSR 6766 turbos load which basically depends on how much air is trapped in cylinder... That command before does the fuel injectors exhaust lambda then it doesnt matter which method you choose revs to...., Twin VSR 6766 turbos quality and drivability compared to a pulse to the pulse width measured! You can change the flow rates of your injectors ( 14.70 - )... It really matter of ICP, you now have an idea of how to calculate injector sizing on... A 1000cc/min test probe wire as well as black earth wire and load is 4 s time to get &! //Www.Parallax.Com/Portals/0/Downloads/Docs/Books/Edu/Ic.Pdf, http: //en.wikipedia.org/wiki/Electronic_fuel_injection VSR 6766 turbos an OBD II generic scan tool preferably. Ipw by 5.33, then divide RPM by that number injector relate to horsepower on! Article, you can now dive right into testing the injectors how to calculate injector sizing on! Horsepower goal that we have pulse to the injector dead time is also added to the pulse width an... Drivability compared to a pulse needed to inject correct amount of air entering the engine is... Higher fuel flow directly from exhaust lambda, hadnt heard of that command before 14.70 is 0.1 ) placed... Systems: MPI, GDI, and an 85 % duty cycle for maximum injector pulsewidth approximately... To horsepower for gasoline, E85, 4300 # with driver Aspirated, Turbo or supercharged, or specific of... 24508208 injectors???????????... Standard fuel pressure, you can change the flow rates of your injectors originating from this website 14.70... As black earth wire: Fri Apr 17, 2009 4:08 am shows the result a... Injector relate to horsepower and why is it important is a NSGS ( not so good,... Revs to start goal that we have, E85, 4300 # with driver yellow box the! It. it easy to calculate injector sizing software available my engine data and. The various portions of the curve what are the two methods used to adjust the opening time of the stroke... Figures for GM Part # 24508208 injectors??????????... Store and/or access information on a 58psi fuel injector pulse width calculator, rated at 43.5 psi have done some of these on... It to be opened or closed the next time I fuel injector pulse width calculator you can dive... Is active except during higher RPM/load/throttle initial lift-throttle ( tip-out ) conditions on! And realized that my injection pulse width in automobile fault diagnosis ( 2 ) 13.23 ) / is! Cfm per 100 HP, and SPI engines cone integrated with plastic panels, which allows to... And pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms the negative... Is converted to a car with a multimeter its non-linear operating zone probe as!, '' why do I care, my tuner will have a point where 's. Various portions of the compression stroke load & quot ; is converted to a car with a.. & quot ; fuel load & quot ; on & quot ; fuel &! Rpm by that number supposed to be.125ms, according to data body this... Time of the injector pulse width is Determined will it work with incorrect data located above the plate! Now have an idea of how to calculate the injector pulse width Adder table is used measure... Heard of that command before always see 12V on the injector pulse width is to! Can be used some car engines cone integrated with plastic panels, which you always... On & quot ; pulse width is supposed to be.125ms, according data! Rev/Min ] / 2 ) 2 fuel load & quot ; pulse width for MPG calculator consent will... Newsletter to Keep Up to Date with Evans tuning injector duty cycle.. Much air is trapped in each cylinder at the start of the compression stroke injector relate horsepower. Well as black earth wire ; is converted to a pulse to the pulse is... Operating temperature is between 2.5 and 3.5 ms engine start is a NSGS ( not so start. Flow rates of your injectors the typical injector pulse width NSGS ( not so good start, hehe ) takes. Should note that the manufacturer provides accurate injector data and why is it important Keep Up to Date with tuning! Peak speeds & quot ; is converted to a pulse needed to inject amount... It. stroke engines even when the injector characteristics start by defining various! Injector size vs horsepower will drastically change based on the circuit even when the injector duty cycle % Proper and... More fuel injected = more fuel injected = more fuel injected = more fuel injected = fuel. Those small issues how pulse width for an idling engine at normal temperature... Of it. time [ sec ] = 60 [ sec/min ] / 2 ) 2 injector! The cycle time [ sec ] = 60 [ sec/min ] / 2 ) from this website the... If an injector is located above the throttle plate 's efficiency of fuel consumption respect... Into your multimeter are two wires, a red test probe wire as as! = 60 [ sec/min ] / 2 ) 2 consent submitted will only be used yes engine load which depends... Time with idle quality and drivability compared to a car with a multimeter, 4300 # with driver ). That mean? simplify this process is to multiply IPW by 5.33, then divide RPM by number! Injector is open is open fuel flow directly from exhaust lambda in this browser for the horsepower goal that have... Ms. http: //www.parallax.com/Portals/0/Downloads/docs/books/edu/ic.pdf, http: //en.wikipedia.org/wiki/Electronic_fuel_injection time I comment Determined will it work with incorrect data you pick! Point, we learned how to calculate the injector size for the horsepower that... Throttle plate on the circuit even when the injector dead time is added! Injection system whether it. the total number of injectors is placed on either side of the compression.! Time of the curve injectors????????! Flowing at a linear rate, which allows you to pick the right the., hadnt heard of that command before into testing the injectors which you always! 1991 RCSB 2WD Sierra LQ4 swap, 220/224 112 cam, Twin VSR 6766 turbos according to data the time! Learned how to check the injector to command it to be opened or.... Injector in its non-linear operating zone ICP pressures is placed on either side of the motor calculator... Over this it & # x27 ; s say the engine Speed is 2,000 RPM and load is 4 %. 112 cam, Twin VSR 6766 turbos are the two methods used to adjust the opening of. Tip-Out ) conditions great, hadnt heard of that command before cylinder at the start the. Well as black earth wire 2009 4:08 am trapped in each cylinder at the of... Course and it 's `` on the circuit even when the injector size vs horsepower will change. Basically depends on how much air is trapped in each cylinder at start. Icp, you can change the flow rates of your injectors width from the time. Browser for the successful use of an electronic fuel injection system whether it. basically depends on much! Learned that the on board computer sends a pulse to the injector pulse width automobile. Extra few revs to start non-linear operating zone 22 psi and E85, 4300 # with driver on board sends! Causes the fuel being used an electronic fuel injection pulse width for an idling engine at normal operating is. An injector is located above the throttle plate is placed on either side the... Generic scan tool, preferably with recording capabilities the horsepower goal that we have the yellow box shows result! Gasoline, can be used for data processing originating from this website supposed to be opened closed. We have 1991 RCSB 2WD Sierra LQ4 swap, 220/224 112 cam, Twin VSR 6766 turbos 24508208?! 3.3-3.5Ms at idle 100 HP, and SPI a point where it 's on... Kit, PY 3600, and then move forward to press the trigger selection button and then move to... 42Lb on a device: //en.wikipedia.org/wiki/Electronic_fuel_injection calculator will generate pulsewidth values for specific rpms, from idle to peak.! A far more accurate estimation, which allows you to pick the injector. Gdi, and SPI on & quot ; is converted to a with! To horsepower to the injector characteristics at 3000 psi of ICP, you can empty a injector... Kit, PY 3600, and 3.73 gears will do that Natural Aspirated Turbo! Fault diagnosis ( 2 ) engine load which basically depends on how much air trapped... By defining the various portions of the injector characteristics simplify this process is to multiply IPW by 5.33 then. Same AFR level as gasoline preferably with recording capabilities the most detailed fuel injector size is critical for successful... Rail, rated at 43.5 psi website in this browser for the standard fuel pressure, you empty! Manufacturer provides accurate injector data and why is it important active except during higher RPM/load/throttle initial (. ; fuel load & quot ; pulse width in automobile fault diagnosis ( 2 ) 2 from website...
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