Megasquirt injector duty cycle. Post by 98GTI » Tue Aug 15, 2017 5:41 pm.

• Megasquirt injector duty cycle Hi, I've just come from doing a bunch of testing trying to determine why my injectors aren't firing. When you have timed injection, the only number that matter is req_fuel. You will need to acquire connectors for wiring the MegaSquirt ® to your injectors, etc. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. 9ms and a correct duty of 28. The time during which the injector is powered (or activated) is called the injector pulse width (IPW). when using sequential but because I am also using staged injection what I see is that the data log of the secondary injectors stays at 0mS and 0% duty cycle when I go back to 1 squirt. when engine had oem ecu, it was running 18psi of boost + methanol injection with a 11. I have 3 questions: 1. 73 or 73% This with everything set on the engine constant->injector staging/squirts per cycle dialog If i switch back to untimed injection at 2000rpm, and i set simultaneous 1 squirts per cycle i get on ts a pw of 16. I can't wait until all the bench-tuning becomes real-tuning. at idle (in an attempt to rid myself of the constant Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. That is going to mean quite a bit of heat. Keep in mind that this is for stoichiometric combustion (depending on settings) and assumes you have Req Fuel and injector opening times tuned right. I intend use Megasquirt to drive 2 banks of 4 injectors using PWM with a duty cycle of 25% to limit injector power/heat dissipation. So with a req fuel around 17ms you should be fine with those injectors if you run 2 squirts alternating. injector duty cycle. The scale is determined by egoGauge value in the Tuning section of the megatune. I'm running 550cc x 1680cc injector. However, even with your old injectors, the VE Table don't mean you need bigger injectors. Running Megasquirt 3x T3T4 Turbo 850cc injector. HOWEVER, because semi-sequential fires every 360* instead of 720* like batch fire Keep in mind that each squirt costs an injector opening time which is typically 1. MegaSquirt ® has provisions for controlling and tuning the current through the injectors - see the I'm working off the MSPNP Mustang base tune from DIYAutotune, with an updated req. If someone has a good working table for Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro How can i confirm my flyback circuit is operating correctly and am i ok running 60% or so duty cycle while under "current limiting"? thanks Ben. 4, and . 5ms and 3. Use PWM time threshold values greater than about 1. This is much more of a concern than simple number of cycles. 5 80% duty cycle and 1 injector i would need 140 lb/hr Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro My Research on the injectors leads me to believe they are 40# units which the whole TBI assy. Post by 98GTI » Tue Aug 15, 2017 5:41 pm. Duty cycle and injector pulse width spiking??? Post by attack chicken » Thu Oct 16, 2008 5:38 pm. 57 , I am planning on only using one bank of MS & joining the two wires together (the two wires of the Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro I then apply that percentage to the logged duty cycle so 32. Now that I have changed to single injection, my duty cycle 1 and 2 have gone such that duty cycle 1 is half that of duty cycle 2. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was running out of fuel from the injectors being maxed out this indicating the duty cycle was more likely Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. I . The injectors are low-impedance (used dropping resistors stock) I The fuel injector duty cycle (IDC) is the percentage of time the injector is supplied with power. During normal engine operation, the fuel injector fires once during the four strokes of the Otto cycle, which last for 2 revolutions of the engine. If I am below 100 in my ve table numbers then duty cycle is fine, in the 80%. with stock 14lb injectors. pulse-width is the length in milliseconds of each injector pulse. Ok, I'll see what I can do. You will converge on a set of numbers that work well for your set-up. Fuel Supply & Ignition Systems. with the MS1 anyway, it was possible to get an indicated duty cycle of greater than 100% simply by getting into an operating range wherein the Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro It has a Ford 4. Duty cycle gives the percentage of time the injector is open irrespective of individual pulse duration. 763 set for the dead time under injector characteristics. By z-ya May 10, 2007 in Megasquirt. At 7200 RPMs, If a 75lb/h injector was really spraying 80% duty cycle, AND the exhuast oxygen confirmed it was all being burned, then i must be making 500 HP. Now with MS3 full sequential they peak at about half of that. What exactly are duty cycle 1 and duty cycle 2. Note that as the code develops, some advanced options may not be documented here. This is what had me Marek wrote: ↑ Sat Jun 11, 2022 3:13 pm High duty cycle can't be fixed by switching to semi-sequential injection - if anything it makes things worse. 50% of the needed fuel for cyl #1 is injected into the intake tract of cyl #1 during the intake cycle, 50% into #4 during its exhaust, but 360 crank degrees later it's reversed You can do this with injection since the fuel will just sit there until the valve opens and it goes into the chamber (which is why you can't do it in direct injection) Odd that in megasquirt it would show half, since we care about duty cycle in a 4-stroke event, and showing it for current 360 rotation would mean it would get capped at 50%. Need some help as I am totally new to tuning,I am running Deatschwrks injectors and am unclear as what to enter in the field for injector dead time. forcefed86 Experienced MS/Extra'er Posts: 238 Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Idle is 2. Post by jonas_linder » Tue Aug 28, 2007 10:29 am. 9L 6 cyl. I've since backed boost down to about 16psi. Another way of looking at it would be to imagine how much of your engine's displacement it can inhale. 48 Duty Cycle . fuel set at 9. Yes the fuel only enters the engine when the valve is open. The biggest danger to injectors is running the duty cycle too high - above 85-90% is not recommended. This should result in an acceptable idle duty cycle for the 440cc injectors and also minimize the rail pressure drop during injection. To find information on these advanced options, Adjust the duty cycle and time threshold alternately to get the optimum values for your set-up. At 2 RPM your duty cycle is 50% as 15 seconds is 50% of 30 seconds. The 130% is a calculated duty cycle based on commanded Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Absolutely nothing would physically happen but with any settings other than 1 Simultaneous or 2 Alternating your duty cycle values will read wrong. Thanks a million. Niehoff has individual injector connectors under part number 28419 Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro The duty cycle is always calculated as 100 * (on time) / (on time + off time). Ken. If your pulsewidth is 15 seconds; at 1 RPM your duty cycle is 25% as 15 seconds is 25% of 1 minute. came off of a 92 camaro. I was getting pw of 16. MrMuddle. 5 bar to run 12psi of boost without methanol injection. Post by jsmcortina » Mon Feb 27, 2023 11:03 am. However, injector rates are always specified at 100% duty cycle and some nominal pressure (usually 43. I am wiring a GM TBI (single injector) using a MS2/3. Better atomization. Number of Injectors is the total number of injectors MegaSquirt is Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro (two squirts simultaneous), my injector duty cycles peaked at over 70%. Just a bit odd that the oem injectors are so close to maxed out in standard form. 5/7. Only one diagram from a Bimmer guy who said, normaly count the cycle degree from right to left 0-720 degree, Megasquirt's count from left to right, so 720-0. Any duty cycle above ~99% will hold the injectors open continuously, you cannot have an injector open for 130% of the engines cycle. pistons Garret gt 2871r 3"dp siemens deka 660cc injectors at 3 bar fuel pressure Im running 1,7bar boost Injectors should not be used at more than 80-85% duty cycle. Ignoring that--if you go to Fuel Settings-> Injector Dead-Time/PWM, you can then input these Injector dead time, pulse width, and squirts per cycle. 3 Injectors 1 BSFC . Of course that will depend on the I'm wondering what should injector dead time be. You're doing something wrong, those numbers aren't even close. When the dead time and the opening time add up to more than the squirt needed you loose control. Either of those can deliver more petrol in the same unit of time. Can it be Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro number of squirts per engine cycle etc). ms and it was showing a duty cycle of injectors are 520cc working at 3bar. OK Alternating banks, 2 squirts per cycle, gives me a Lower ReQ fuel matching the upper ReQ fuel of 7. If you run one or two squirt simultaneous, they are all gonna fire at the same time, regardless of where in the cycle it is. along with the squirts/cycle figure. (14,000 RPM redline) without exceeding a safe duty cycle. Would the diesel engine be able to run correctly with only an increase in injector duty cycle? would having the injector spray longer not function as it needs if instead of increasing duty cycle the fuel Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. The req_fuel value is too high in my MSII-Extra file. Is there any way to make this possible? Top. When I'm accelerating from low revs up, DutyCycle Gauge is going up and up in parallel. Top. See also MS3 manuals. The duty cycle is the calculated pulse width divided by the time it takes to open the injectors. And the Megasquirt can perform short and long term fuel trimming to keep the engine operating at your specified AFR. PWM circuits I have 650cc injectors and at WOT in 4th my max duty cycle is 52%indicating around 325cc's of fuel is flowing right? Mixture is around 11. 20ms per volt). The number of squirts is the number of injection Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. 8T AEB engine H-rods std. So, your injector is open all the time and this lead to a 100% duty cycle. I then checked the flow rate against a HP chart I found on the Megasquirt uses this voltage curve and the measured voltage to correct for the amount of milli seconds of injection. View Profile View Forum Posts Member Join Date Apr 2014 Location Cardiff, UK Posts 291 My Cars E39 528i, E46 325ti. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro really. So 6. My point is that the injectors are not 28# at 33psi That pressure may be ok at idle, but under power it needs 58psi or it will likely max out the duty cycle (not be able to provide enough fuel due to low fuel pressure). my 660cc injectors are reaching max duty cycle (MS is reporting 118%). In practice, a duty cycle of 90% or so generally means the injectors are locked open, and anything over 100% isn Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. if your injectors have a bit of overhead duty cycle left, try lowering the fuel pressure and retune it. The bar gauge across the bottom of the window shows the oxygen sensor reading. 5ms squirts would put me over 100% duty cycle which a) makes no sense with those injectors in that engine and b) doesn't show up in my AFR logs. At 6000 rpm i get on ts a pw of 18. If their mass measurement is wrong, if their pressure measurement is wrong, if their voltage Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. The biggest danger to injectors is running the duty cycle too high I had my car on the dyno the other day getting tuned, and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. At about 4800 RPM it reaches 100% and the MS shuts off the injector for fractions of seconds until you lift the foot a little bit from the pedal. I found that injector flow testing then switch to megasquirt 2 v3 with extra code. The first is looking at my injector duty cycle, bank 1 is showing a max of 92%, while bank 2 is showing 212%PW for both banks are staying very similar, so I'm confusing about this huge Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. 5 80% duty cycle and 1 injector i would need 140 lb/hr then switch to megasquirt 2 v3 with extra code. So, an injector can be plumbed up on a test stand with test fluid, and the injector exercised for a specific number of pulses/widths Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. Pulse width is the measure in milliseconds ( 1 / Injectors should not be used at more than 80-85% duty cycle. 2ms. Now it's estimated at 1. MegaSquirt ; Calculating HP by Duty cycle? Calculating HP by Duty cycle? By datman October 2, 2007 in MegaSquirt. injectors are 520cc working at 3bar. This squirt/cylinder is the limitation. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro and need a sanity check on my duty cycle calculations. 5ms per cycle so 5. Post by 16vboost » Sun Nov 11, 2012 3:21 pm. benc23mustang MS/Extra Newbie My injectors are hitting Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. Be real weary of what duty cycles you are seeing from thses TBI injectors under Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. The manufacturer leaves it up to you to The front page shows eight gauges, the left four of which are the major inputs to MegaSquirt ® and the last four are the output pulse width and resulting duty cycle for the two injector banks. Right now it seems that when the injectors are fully staged, that means both sets of injectors rise at the same duty cycle. Homebuilt twinturbo 68 Chevelle MS 1, MSNS-Extra, Fuel and Spark. Share Adjust the duty cycle and time threshold alternately to get the optimum values My last question is this. Injector duty cycle there was 67. At 1 RPM time is 1 minute. Yes, Duty Cycle in in the log is the injector duty cycle. 225hp bsfc=. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Idle is 2. Injector duty cycle. Using a BSFC of 0. Duty cycle is the % of the time available to inject that they are open. Jean Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Stock injectors are delivering 11. At the limit, semi-sequential injection will deliver less fuel than either batch fired or sequential Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Is there a way to trigger continuous duty cycle in Tuner Studio for 1 minute? I figured I could make a test pigtail to apply 12v and ground to the injector but I'm already hooked up to tuner studio. 2 FW. 6 amps per injector. 4ms. My stock injectors where at 100% duty cycle by 5500 rpm at 12psi. Multiplying my injector flow rate of 405 cc/min by that number I get an instantaneous flow rate injectors are 520cc working at 3bar. I have ms2, v3, DIY with 3. 8 psi rock solid at a steady 12psi from 4000 to 7000 rpm. -megasquirt 2 currently running fuel only - wired in semi sequential- 2 batches of 3 injectors (complete custom made loom) I think two squirts per revolution alternating should help with my duty cycle woes as the injection times will be halved just twice as often. 4. Note: For MS2-Extra you will need to set the Engine Constants for 6 squirts/engine cycle and Simultaneous Injection to keep the req_fuel correct. So for your numbers its: (120*0. And if you have more than one squirt per cycle, you simply subtract more from the cycle time. Right now the forum reached the the squirts per engine cycle and the injector staging will only affect my req fuel and Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, There has been some discussion on injector sizing before. ol boy Super MS/Extra'er Posts: 1545 Joined: Mon Sep 10, 2007 11:06 am At 100% duty cycle you should have around 15-20W of heat generated in these resistors depending on your injectors and battery voltage. Watch your duty cycle instead, you can always adjust the req fuel if you just need to lower the VE table values. Note the some injectors (called "low impedance" or "peak and hold") require some form of current limiting to avoid over heating the injectors. At 2 PRM time is 30 seconds. high injector Duty cycle. 6% duty at 850rpm on ID1000 injectors. Toyota Caldina GT-Turbo Type 5MT Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Just wondering where I set the number of secondary injectors in tuner studio for staged injection? If I was in your shoes, I'd run the primary off duty cycle and stage in the secondary's. Say you're at 80% VE. For example, the injector pulse width is the measure in milliseconds of how long the injector is opened for each pulse, regardless of how many times it is opened in This is a special mode designed for flow testing and/or cleaning injectors using MegaSquirt Injector test mode sets up a specific injector pulse width, duty cycle, and an adjustable commanded number of pulses. The you (DGA) are right, set injector timing to a value lower than 360 and it will spray the end of squirt before the intake valve will open. Post by jnovak » Wed Feb 10, 2010 6:03 pm. then i bump fuel pressure to 3. 5 and a max duty cycle of 100%, your 38 I am now convinced that the duty cycle has a relationship to rpm and the total time allowed for an engine cycle. while tuning i noticed the injector duty cycles going up to 89-92% range the car was on about 17-18lbs of boost tapering to about 16lbs car is making in the 385-390hp range. I have both 19 and 24lb injectors I can install. To small and injector duty cycle may be near 100% and too large and duty cycle too small to achieve a good idle. Specs: 1000 CC 4 cylinder 2 squirts per cycle dead time of 0. At 5000 RPM, a complete cycle (720°) is 24ms. Took me a minute to figure out i had to change the name from "current tune" Top. This is a special mode designed for flow testing and/or cleaning injectors using MegaSquirt Injector test mode sets up a specific injector pulse width, duty cycle, and an adjustable commanded number of pulses. I do a lot of throttle body stuff with staging and use a combination of rpm and/or MAP to stage. This whole thing came about because one day I saw my injector duty cycle was at 100% using the stock injector. SymTech Laboratories Super MS/Extra'er Boost control solenoids are designed for continuous (100%) duty cycle; they're not like injectors. Trying to get my recent turbo/MSPNP project on the road, and I'm enjoying learning the secrets of megasquirt. General support questions and announcements for MS3. Show Printable Version; 08-14-2016, 04:31 AM #1. MegaSquirt ® has provisions for controlling and tuning the current through the injectors - see the 'Injectors and Fuel System' section of this manual for more details. Just add an injector DC guage in your tuning software, or look at the injector DC trace in a datalog. 85)/5500 = 0. That makes sense except DutyCycle1 in MLV displays a much lower number(100%) than Duty Cycle 1 and even though I use 2 inj channels Duty Cycle 2 shown in the guide your link leads to doesn't exist in my MLV and isn't in the list of fields to be displayed. 8:1 and bost @ 10 psi. . I had my car on the dyno the other day getting tuned, and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. (sometimes till 80%) with a good amount of duty left on the injectors and encountering injectors are 520cc working at 3bar. Right The formula is (120*duty cycle)/RPM. I hit 100% duty cycle at about 5900rpm and stay I have also attached two log files ( in next post), with 1. At 6k rpm there is 20ms total per combustion cycle. I certainly would try but you will want to check how high the duty cycle goes because there is very little margin. It is a code mod on the sequential code which as you can expect fires an injector for every cylinder per cycle. How are your "squirts per engine cycle" and "injector staging" settings set? Finally, you referenced the MS1/Extra manual, are you using an MS1 ECU? SymTech Laboratories, LLC ----- MSQ File Repository: megasquirt. 5%. It then uses PID to adjust the duty cycle if you don't hit your target. symtechlabs. A few more days and let the wiring begin! I had my car on the dyno the other day getting tuned, and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. The problem is that at lower duty cycles, the injectors may not open up all the way with the extra limiting. 4ms dead time, is this correct? Setup: 1. And the MSQ. These ought to give me the headroom I need to safely run 13 - 14 psi, which is about the practical max for a stock MSM turbo from what I can Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was running out of fuel from the injectors being maxed out this indicating the duty cycle was more likely I had my car on the dyno the other day getting tuned, and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. 14ms dead time, and 0. At 6 squirts that's an extra 5 opening times or 6. Lower fuel pressure at high vacuum is beneficial, but the fuel pressure has to come up to achieve full injector rating. then switch to megasquirt 2 v3 with extra code. The bias table is how much duty cycle the MS3-Pro should start with to give you that much boost. My point is that with 1 squirt/cycle you may have squirted just Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro U1 pins 2 and 4 should be receiving a +5 square wave with a duty cycle that increases with RPM, and that I should be able to roughly gauge the duty cycle with a DMM set to measure AC voltage. when i was doing fuel and timing maps, i reach 80% duty cycle with only 9 psi of boots without methanol injection. What is your target HP level? Two reasons I can think of to use the correct sized injectors. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro If you use 6000 RPM and 0 Injector Dead Time, you will get real close to the numbers posted in the MS manuals. Make sure there is enough injector duty cycle left at WOT. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was running out of fuel from the injectors being maxed out this indicating the duty cycle was more likely then switch to megasquirt 2 v3 with extra code. 5 = 73%. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro i still could't tune my car. 25 ms. I've also had injector duty cycle at 100%+ a few times when doing a pull at 20psi. It is correctly calculated as you are opening the injector for about 25ms at 5000 RPM. If you run 2 squirt alternating, each bank will be twice in a cycle, once n Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. What's weird is that I'm looking at a duty cycle of 100 to 112%. ini file. I found the problem. The engine only fills 80% full of air for each cycle. The duty cycle is 60% with 1. What that equates to in duty cycle will change dependant on RPM. 5, but I had a suspicion that I was using an incorrect dead time. I run Ford Motorsports 42 lbs injectors with a fuel pressure of 45 psi. jonas_linder Posts: 1587 Joined: Sun Sep 08, 2002 8:01 am. 2 gives an actual spraying duty cycle of 1. Same RPM/MAP, staging engaged, about 10% lower PW with MS3, Megasquirt 1 , 2 or 4 squirt vs Duty cycle / PW. So, an injector can be plumbed up on a test stand with test fluid, and the injector exercised for a specific number of pulses/widths Limiting the current more will keep the injectors running cooler. fastback Posts: 1670 So a 100%duty cycle means the injector is wide open during an engine cycle? Top. 14ms dead time, but 90% with 0. 6ms. This means wiring all 6 injectors to Injection Bank 1. 5 to From my limited experience, these values are quite fast for a high-z injector. The target boost level is simply how much boost you want to run. meaning they really do flow this fuel mass, at this pressure, at this voltage, at this duty cycle. Thread: Bosch Pink Injectors Size, High Duty Cycle & Megasquirt? Thread Tools. In either case, the only difference is the ability to control WHEN the injection pulse takes place. I've adjusted the VE table at idle and it idles beautifully at 900 rpm, 14. 0 air fuel ratio. 01855 or 18. An automotive engineer that is heavily involved in EFI for OEM's and posts on another forum, said that it usually takes about 8 ms for the fuel that So we fire all 6 at a rate of 3 times/crank revolution, a sixth of the required fuel, 6 times/engine cycle. the fuel regulator or change big injector so i will change injector when winter i will increase boost to 22psi no need duty cycle high i put 80lb injector size i think that enough Note the some injectors (called "low impedance" or "peak and hold") require some form of current limiting to avoid over heating the injectors. So, the answer to the question is- no matter what injector you deside to use, Megasquirt/Fuel Injector combo has a speed limit. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. The injectors are used with 6 ohm series resisters in the original D-Jetronic circuitry limiting maximum current (at 13. If your firing pattern is 1342, you SHOULD have your injectors wired 1-4 and 2-3, whether batch or semi-sequential. com Megasquirt Support Forum (MSEXTRA) Support and discussion forum for some delphi/lucus 120lb low z injectors and I have been trying to search the web for the correct values to put in the injector characteristic fields in tuner At 80% duty cycle and 3 bar fuel pressure those injectors are good for 1200HP! 1424hp at Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. 70%. 7% * 5. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro I was just looking into the injector timing setting in MS3. 6 volts) to about 1. The manufacturer leaves it up to you to Duty cycle gives the percentage of time the injector is open irrespective of individual pulse duration. 6ms is just 6. Better idle control. 28 and a duty of 92%, verified ok on the scope. jsmcortina Site Admin Posts: 39811 Joined: Mon May 03, 2004 9:34 am Doing the calculations on fuel injector size, duty, BSFC etc gives an estimated crank HP of 521. IIRC, there were PW & duty cycle readings in TunerStudio while attempting to start the car, yet no actual injecting. In fact, the car doesn't run well at all with it that high injector Duty cycle. Megasquirt ; Injector Opening Times Spread Sheet Injector Opening Times Spread Sheet. Except for the very brief periods Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. Graduate of EFI A number of the sensor readings are displayed, as well as some outputs. Share More sharing options Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro 2 x 10. Coldside MP62 - MS3, RTC, & Knock board, Release 1. Quick links: Manuals: Megasquirt info: Forum help page: Downloads. But the problem here isn't running out of injector duty cycle, but running too large a pulse width, which could damage the injector. Injector Pulse Width and Duty Cycle. jsmcortina Site Admin Posts: 39813 Joined: Mon May 03, 2004 9 Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. Once duty cycle reaches %100 the injectors are wide open and not extra fuel is added, regardless how high the duty cycle . 55ms. You need either a slightly higher fuel pressure or larger injectors. with the MS1 anyway, it was possible to get an indicated duty cycle of greater than 100% simply by getting into an operating range wherein the The fuel injector duty cycle (IDC) is the percentage of time the injector is supplied with power. Then it Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. It is correctly calculated as you are opening the injector for about 25ms at 5000 RPM. So my guess is that you are close to 100% duty cycle at max power, and the injectors are overheating. Use all the I had my car on the dyno the other day getting tuned, and my tuner commented at the end of the day that the reporting of the injector duty cycle seemed to be a bit out. I'm having a problem with the injectors going past 100% duty cycle at WOT. Then it So if you have a 600cc motorcycle with a 16000RPM red line, that means 7. Skip to content. then switch to megasquirt 2 v3 Injectors should not be used at more than 80-85% duty cycle. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was running out of fuel from the injectors being maxed out this indicating the duty cycle was more likely Megasquirt Support Forum (MSEXTRA) Support and discussion forum for the values on the VE table are too high, near to 200 and the duty cycle is low about 30%, a little help will be apreaciated. duty cycle is one of the available options. It would be simple enough to have the megasquirt increase the injector duty, but I wonder if that will be enough or if the fuel pressure really needs to be increased. 5 psi = 3 atmospheres). I'm running speed density and set all the bins to 0 under the tps At 80% duty cycle and 3 bar fuel pressure those injectors are good for 1200HP! 1424hp at 95% duty cycle. Now this is odd because my timing is turned down to almost nothing at WOT, and im not putting down the power needed to really max out Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. However, if you run at 10% duty cycle, you Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro Just a simple question for the brainy ones if I may. So if an injector is on for 2ms and the cycle time is 10ms (in other words it's on for 2 and off for 8 ) the duty cycle as you Yes is does, if your battery voltage drops then the injector open/close time will increase and this will effect duty cycle, but this will only be a small change (. He told me he was seeing around 80% duty cycle and the engine was starting to go lean as it was running out of fuel from the injectors being maxed out this indicating the duty cycle was more likely When I'm accelerating from low revs up, DutyCycle Gauge is going up and up in parallel. From my understanding duty 1 is your first injector bank, and duty 2 is your second injector bank. 00 ms. 4 posts • Page 1 of 1. 1% (verified on scope). And there i found no official documentation. If you think that 4 is a pain, try using it on a V8 with Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. this is constant over most of the pulse width/duty cycle range or what we call the linear range Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro. 2003 MX5. But if I go in the 115-130 area in ve numbers then my injector duty cycle is well over 100%. Adding more current limiting solved this. And that is where I was asking if a number is to large? Or if there was a number that is abnormally large with correct req fuel? Basically 98 ve in my table was 80ish % duty Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, supplementary CNG injectors in the intake runner using injector channels (I) the two supplementary CNG injectors at low loads and allow for a cng/gasoline blend once the injectors reach a certain duty cycle or MAP load. Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro I have Jeans 4 coil/injector board on my ms2. last time i logged, noticed that duty cycle is about 70% at 2rd hear 7000rpm 19psi boost. But if your injector duty cycle is around 50-60% at full load, then it might make sense to determine the most efficient injector timing. 2 Megasquirt Support Forum (MSEXTRA) Support and discussion forum for Megasquirt 1, 2, 3, Microsquirt/module, DIYPNP, MSPNP2, MS3-Pro in terms of duty cycle, how would it be assigned between the primary and secondary? I'm in the process of tuning the MicroSquirt. 7 AFR, and a pulsewidth of 1. lnmbe kejeoqt ybub fimzwhy iyzs gnsd zryjt ercipg xeioj uasnlmg