Grant. Posted October 4, 2010 Share Posted October 4, 2010 hi all!! I am using a bosch pwm valve (bosch 0280140516) for my megasquirt set up. In my wiring diagram i have 4 wires (red&green, green&white, blue&white, orange) however only 2 wires on the replacement stepper motor/ air solenoid. Anyone able to help me out? which wires do i need?? Thanks in advance!!! Quote Link to comment Share on other sites More sharing options...
Hybrid_From_Hell Posted October 4, 2010 Share Posted October 4, 2010 YUP Orange to 12V live Red and Green pin 30 Also Pink to Pin 36 and injectors are banked 1 3 5 7 2 4 6 8 Nige Quote Link to comment Share on other sites More sharing options...
Grant. Posted October 4, 2010 Author Share Posted October 4, 2010 Thanks Nige So the other wires arent needed? Quote Link to comment Share on other sites More sharing options...
Grant. Posted October 4, 2010 Author Share Posted October 4, 2010 also, meant to ask.... with the megasquirt injectors wired up like that, would i therefore be firing into 3 dead cylinders (as in not under compression) on each cycle? Chaars:) Quote Link to comment Share on other sites More sharing options...
Grant. Posted October 4, 2010 Author Share Posted October 4, 2010 ah... just found an old diagram to compare, all sorted!! Cheers nige Quote Link to comment Share on other sites More sharing options...
mad_pete Posted October 4, 2010 Share Posted October 4, 2010 I thought bank fire was pretty rubbish when I looked it up too. The injectors just atomise fuel near the intake valve and it sucks it in. You can get sequential fire but I think the timing is tricky to get exactly right and can do more harm than good. I think the idea is the air near the valve is fuel / air and the valve just sucks it in when it is ready. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted October 4, 2010 Share Posted October 4, 2010 First off, that diagram is for a stepper motor idle valve (4 wires, needs MS-2 to control it) so ignore that part. There is info on wiring Bosch PWM valves either in Nige's thread (I'm guessing, be surprised if there isn't) and on the MegaSquirt forums. This is the diagram you need, note it says "Fast idle, not used on RV8" this was for the old on/off idle valves but PWM idle uses the same pin. Bank fire is fine, sequential intuitively seems like it should be better but it only gains a little at low RPM & idle. Most sequential systems "fall back" to bank fire as the RPM and load increase simply because there's no point doing otherwise. Most of the time, injectors are firing at a closed valve anyway (think valve opening duration Vs injector open-time per cycle). There's loads more on this on the Megasquirt forums & megamanual as almost everyone asks the question first time out - I did Quote Link to comment Share on other sites More sharing options...
TheRecklessEngineer Posted October 5, 2010 Share Posted October 5, 2010 Bank fire is fine, sequential intuitively seems like it should be better but it only gains a little at low RPM & idle. Most sequential systems "fall back" to bank fire as the RPM and load increase simply because there's no point doing otherwise. Most of the time, injectors are firing at a closed valve anyway (think valve opening duration Vs injector open-time per cycle). There's loads more on this on the Megasquirt forums & megamanual as almost everyone asks the question first time out - I did So did I. I think it was the mighty Bruce Bowling himself that tested it vs sequential injection. His conclusion: f all difference! Quote Link to comment Share on other sites More sharing options...
Grant. Posted October 5, 2010 Author Share Posted October 5, 2010 Thanks guys for the input! Really appreciate it, just trying to understand EVERYTHING! ( or near as damn it! ) before my friend and I let loose with fitting the new engine and megasquirt set up. I realised about the injector wiring though after i found an old 1990 range rover efi wiring diagram, which only had 3 different wires doing all the injectors aswell, so after that I assumed it was the way! Cheers again guys for the help though. Really appreciate it! Will get on with getting it all in and running now! Quote Link to comment Share on other sites More sharing options...
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