Originally posted by Thuppu
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VEMS AAN cut out - engine goes dead..?
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Yes, seems that the VEMS output is failing: http://www.s2forum.com/forum/showpos...postcount=1480
Realised today that the voltage that VEMS sees drops almost one volt when I turn on the lights..?
Soo, how do I know where from(on the board) I will connect the injector output to fuel pump pin(Motronic)? This is how my VEMS looks like
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
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Originally posted by Thuppu View PostYes, seems that the VEMS output is failing: [
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Originally posted by diesel des View PostMy vems is a stock setup with an adapter cable to go to the motronic connection. It looks nothing like that inside.audi coupe quattro b2 2.2 20vt project (573hp-626nm)
TWINCHARGED power,zero lag
AEM W/M injection
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The above looks horrible on very many levels.
First, I can spot a few cold/dull solder joints from the picture.
Second, I can see lots of overheated solder joints...
Using the same color wire for everything is a hugely bad idea etc.
It's a mess, and troubleshooting anything in that mess is also difficult.
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It have been working well, untill now when my FP output started failing. Propably not the only one who have issues with the P259 output. This is propably a DIY VEMS, wires goes directly from the board to the Motronic connector. Could be done nicer, I agree on that. There also seems to be tweaks here and there, extra components etc.., I have not a clue what they are. For example the little board on left with two chips.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - Project
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All i see is errors waiting to happen if you keep running that... pretty sure it is limiting your performance already as it is due to the wiring/connections/resistance.
I work with proto hardware on engines for a living and that what you have now is my biggest nightmare & time consumer, finding other mans bodges.
If for instance your on board reference voltage drops it can give very strange sensor readings leading to simple hick-ups upto total engine failure. Now in your/our case there isn't a lot of closed loop controller action / sensor based corrections in VEMS but i would not take the gamble.
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thomas,do you reed my solution for fuel cut on your other thread?
why not just use a relais to give power for the fuelpump and injectors which closes with the ignition on? i'm sure this will work
vems can still make a fuel cut by injectors if necessaryaudi coupe quattro b2 2.2 20vt project (573hp-626nm)
TWINCHARGED power,zero lag
AEM W/M injection
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Originally posted by quattro-nick View Postthomas,do you reed my solution for fuel cut on your other thread?
why not just use a relais to give power for the fuelpump and injectors which closes with the ignition on? i'm sure this will work
vems can still make a fuel cut by injectors if necessary1360kg/600Whp Avant 0-200km/h 9sec
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