IAC's How else can i get them down?
 

I'm trying to get my IAC count down to about 30-50. i drilled up to about 3/16" dia. hole. im still reading about 75 at warm idle. should i drill bigger or is there another way. i dont want to drill to big and have it mess things up! thx in advance! :usa:

Re: IAC's How else can i get them down?
 

Do you mean you added a second hole that size? Anyway, If you're worried about making the hole too big, try using the idle stop screw to let some more air through; it will be pretty touchy, but at least you can put it back.

Re: IAC's How else can i get them down?
 

Wouldn't the PCM learn it out??

Re: IAC's How else can i get them down?
 

The PCM will drive the IAC to what ever count it needs to get the airflow right no matter what size the hole or holes are . . . BUT if the hole is too small or too large, the motor may not have enough adjustability to dial it in; it will be out of range. That's why the hole size has to match the cam size. For example, the stock TB hole on my car with the TR224 works fine until I turn on the AC, then it can't flow enough air even with the IAC counts maxed out.

Re: IAC's How else can i get them down?
 

Ahh, since I think the max is 127. And I am @ 90. I shouldn't have to drill. Or should I still try to get them under 70?

Re: IAC's How else can i get them down?
 

You could try changing the IAC table in Edit too.

Ed: I would leave the TB alone if your idle and low speed drivability are fine.

Re: IAC's How else can i get them down?
 

I am just fighting a small surge @ off-idle. Otherwise, I have it tune pretty good. Idles fine with no stalling. Would drilling help in that area?

Thanks.

Re: IAC's How else can i get them down?
 

Yes, on an A4 drilling the TB will help with surging. Just don't drill it too much; the biggest I've heard of anybody going to is 0.250 inch, and that was with a 230 duration cam. It's best to drill one size at a time.

Re: IAC's How else can i get them down?
 

I would only go up 1/16 at the most. Too high and you get a cruise control effect from the extra air.

Re: IAC's How else can i get them down?
 

Thanks I have that cruise control sometimes. I will have to see if I can get a spare TB or blade just in case I screw up.