ChrisAudi80 wrote:Kevin Black at Lugtronic apparently knows how to implement good IAC control on VEMS. However, it is most likely a closely guarded secret.
ChrisAudi80 wrote:Wonder where OP went...
Anyway, I am controlling the AEB IAC with VEMS now. Its a little better than no IAC. Took some fiddling. Followed this thread: http://forums.vwvortex.com/showthread.p ... S-iac-help
I did like Prof315 said: " I wired up the idle motor part of the throttle (pins 1 and 2) backwards so pin 1 is PWM control and pin 2 is switched 12V. Then I set the MS3 PWM idle control to run inverted. I'm running the valve at 200hz and the DC range is roughly from 40% to 100%. "
Have to play with DC a little and still dialling it in. Not so sure my TB is 100% anymore. Might have not open it up and spray a little WD40 in there.
Can actually get idle with AC on to go to 800rpm!
beemer832 wrote:ChrisAudi80 wrote:Wonder where OP went...
Anyway, I am controlling the AEB IAC with VEMS now. Its a little better than no IAC. Took some fiddling. Followed this thread: http://forums.vwvortex.com/showthread.p ... S-iac-help
I did like Prof315 said: " I wired up the idle motor part of the throttle (pins 1 and 2) backwards so pin 1 is PWM control and pin 2 is switched 12V. Then I set the MS3 PWM idle control to run inverted. I'm running the valve at 200hz and the DC range is roughly from 40% to 100%. "
Have to play with DC a little and still dialling it in. Not so sure my TB is 100% anymore. Might have not open it up and spray a little WD40 in there.
Can actually get idle with AC on to go to 800rpm!
I found this discussion after a quick google search. I just installed a VEMS system on my AEB 1.8t and am having idling issues like was mentioned here. I am very new to the tuning side of things and have EFIExpress helping me, but I'd also like to learn on my own.
So I am guessing that my idle issue, which seems to be fine when the car starts, but as soon as you blip the throttle, and it starts to come back down, the car will not idel. When you're driving you must rest your foot on the accelerator at a stop or it will stall. If it stalls, you need to tap the throttle a few times to get it come on.
I did the idle enrichment curve already and I am between .90 and .95 lambda so I assume I am good there.
If this seems to be the issue, I will start following the writeup that was linked and see if that fixes my issue. Thanks!
-josh
beemer832 wrote:I haven't even tested the AC being on yet. It has this issue just trying to idle with no load. I will take a look at your config and see how mine compares. Thanks!
-josh
Urtorsen wrote:Sorry haven't been paying much attention to the forums most weeks.
That's great to hear that works, I would've been afraid to try that incase I popped something lol.
I could get it to work but to make it driveable like the Bosch 2 wire independent isv valve didn't happen, has either of you tried the higher freq available now?? It's like 400hz or higher , I forget ....Marc has my ECU right now though and my blocks being machined so I can't tell .
I just didn't like the rev hang in high duty in hot weather and the AC on in traffic, coming to a stop it wouldn't smooth out quick enough , after countless tries of adjusting the PID. .
i got all of that to work on the isv valve no problem, I'm probably gonna go back to the throttle body idle motor when I get it running again. I can try a little stepper idle valve after that if it doesn't work.
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