BLMONGOOSE

Antone else how has an aggressive cam and had to drill the throttle body please post what size hole you used to drill into the throttle plate.

I just installed a pretty agresive cam and I have been trying to use ls1 edit to make her idle well but I just cant get it to work. My mechanic recomended that I use a 1/8" hole but other guys I have talked to have used a 5/16" hole.

I want to get a feel for what size hole you guys have. Please post ASAP because I wont to do this mod today.

If anyone has any other trick to get her to idle well please let me know.

Hear let me describe my situation:

I can start her fine without my foot on the gas, she idle normal when cold and hot. But when I rev up the engine and the RPM come doen they go below the normal idle, 200RPM's, and she sometimes recovers and stays on but most of the time she turns off.

What Iam guessing is that the throttle body does not open fast enough when the RPMs come down to the idle spot. Due to the agressive cam the engine asks for more air than the throotle body can supply as the RPMs come down. So if I drill a hole it will let the engine breath a little more as the RPMs come down and she will stay on.

jmX

1/4" is as big as I'd go. I had I think a 7/32" hole in mine when I had a 230/230 on a 112lsa cam.

I'd say start at 1/8", if thats not enough do a 3/16". It only takes like 3 minutes to remove the TB and you DONT want to go to big. Take your time and just step up through the drill bit sizes until it works nice.

98TAauto

iTrader: (2)

1/4th bit for my 224/224 cam

my idle is set at 900 also
throttle set screw has been turned one ful turn

Hellion

Here is a link that has many different cams and TB drill sizes. Maybe your cam is on there and you can duplicate their setup <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

http://xs-fx.com/raughammer/cam_info.htm

BLMONGOOSE

Where is the throttle set screw? Ive never herd of this. Is it on the Throttle body?

Scalpel

iTrader: (4)

BLU, you have a C5 and there is no set screw on our TBs. Drill the hole on the lower portion of the butterfly in the middle. Use these lists of drill bits until you get the idle to stabilize and no issues with coasting to a stop. Start with these: make sure after you drill it to do a good bit of driving around so the car can learn for the increased air at idle and adjust for it.
(increasing size from left to right)
3/16 --> 13/64 7/32 15/64 1/4 17/64 9/32 19/64 5/16 21/64 11/32 23/64

Ragtop 99

iTrader: (7)

If you have Edit you can increase your IAC tables by 10 - 15% and you may not need as big a hole. Use as small as possible to get the job done.

BLMONGOOSE

I run a supercharger on this car, Iam not too familiar with ls1 edit I just got it a few days ago so Iam new to the whole programming.

What does IAC do?

If I inrease this can I be more vulnerable to detonation?

BLMONGOOSE

Well forget about the IAC thing. I just went to try and edit that table and it tells me that this feature in not implemented for my year.

98TAauto

iTrader: (2)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by BLMONGOOSE:
<strong>Well forget about the IAC thing. I just went to try and edit that table and it tells me that this feature in not implemented for my year.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">you have a 98?? It said the same for my 98TA

jmX

C5's dont have IAC.