Audi RS2: Long Block 2.7 liters, Motronic VEMS, 7.5 to 1 Comp, Precision 6265, 10 bosch injectors 550cc @4bar. 034 DIS high output coils, 60-2 crank sensor.
9/02/2012
audi ADU idle too high at 2000rpm, IAC badly controlled
Information relative to this topic will be moved into a folder very soon
9/02/2012
Here below are the information relative to the bad cold start when cold
MembersPage/LoloQuatro audi ADU no craking when cold, ether needed link to the log is now available
13/02/2102
still same difficulty to crank when cold, any suggestion ?
Crank when warm is fine.
13/02/2012
Once warm press the throttle and relase the idle goes back to normal, but when engine is loaded, press throttle and relaese then the idle goes too low.
What are the step to adjust the IAC PID ? I do not understand clearly the combination and effect of these parameters and the documentation is very limited on that topics.
Many thanks in advance.
Laurent.
-- First off you need a flat area of VE in the idle region, otherwise your fueling will be all over the map. Make the lower left four values much closer, right now they are off from each other by huge percentages and that will induce oscillation. Second your I factor is probably too high, but start by setting PID all to zero and making certain that your idle PWM reference table gets you close, overshooting just a bit, perhaps by a hundred RPM or so. Then when you have that commence PID tuning. If you need more I have written a whole tuning guide for AAN and have learned more since then.
13/02/2012
I have some question when the difference between afterstart and warm-up is not so clear and also deadband meaning.
I encounter some difficulty to understand some of the parameters.
Is their a good VEMS user in France around Paris for brief advice ?