Drilling TB?
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You should never have to drill into the TB anymore than GM did when they sent it out. Either adjust the TB blabe to allow more airflow in @ idle or get a good tune. Just my .02
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Drilling actually IS the correct way to deal with the problem. You are best off drilling a completely separate hole though, starting really small, and work your way up from there. Drilling out the existing hole could lead to it ending up being bigger than you really want.
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A full tune will follow an order similar to this (Set idle,set IAC, reset tps, tune LTIT/STIT's and make adjustments to RAF table, tune VE in idle area) When some shops tune a car they only tune WOT and a few other parameters. Get a full "drivability" tune and all the tables should be reviewed and edited if needed.
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When we did my buddies cam we drilled the hole and then got it tuned. Of course with a bigger cam the car is going to want more air at idle, so you need to allow it more air by DRILLING THE HOLE. Don't mess with the screw. If you do that then you are just opening the tb. Drill the hole. I'm not sure what the stock size is, but go at very small increments, it wont take much especially with the hotcam.
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Isn't that's what that screw is there for? I mean if you drill too bigg of a hole than your TB is ruined IMO, but it you adjust the blade itself not too much damage can be done. Wel besides messing up the AF ratio. I agree w/ SgtB on this, there is no need to drill the hole when you don't have too. Just my .02