LT1-LT4 Modifications 1993-97 Gen II Small Block V8

BBK throttle body

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Old Mar 27, 2011 | 01:48 PM
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Default BBK throttle body

I got given a used 52mm BBK throttle body last year and finally got around to installing it and setting it up.
I have it set it to idle around 800rpm (m6) with TPS volts at 0.66v and IAC counts at 22 with the throttle stop backed completely off.
The car has almost every bolt-on but stock heads/cam.
Every where I have read suggests that the IAC counts should be nearer 30 but with the throttle stop backed off and the TPS set virtually spot-on there is nothing else I can do to adjust it?
Is 22 ok or should I be looking to achieve closer to 30?
Car is 97 T/A.
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Old Mar 27, 2011 | 03:35 PM
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Was the TB already drilled for IAC bypass? The stock TB has a small hole drilled to let some of the air get through without going past the actual IAC aftermarket TBs need that drilled and different setups can often require a larger hole be drilled. Maybe the hole is already slightly bigger than your setup needs?

Long as it drives OK though I would not be too worried.

This is one of the reasons why for 52mm a rebored stock TB is often easier to deal with, for the price though I would be making the BBK work.
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Old Mar 27, 2011 | 04:16 PM
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What he^ said.
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Old Mar 27, 2011 | 09:33 PM
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Try .67 volts on the tps. Not much of a dif but could make the did????
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Old Mar 29, 2011 | 06:41 AM
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Thanks for the replies.
I will have to check for oversized IAC bypass, and maybe try and tweak for the TPS for that extra .01v.
But I guess only driving it will tell and the winter lay-up ends this weekend so perhaps I'll just go for a drive and see how it goes. Got to get some miles on it to break in the clutch!
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Old Apr 4, 2011 | 02:36 PM
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Car ran like a a dream. Plenty of power and responsive too.
Think I'll leave the IAC and TPS as it for now.
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Old Apr 4, 2011 | 02:45 PM
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GM spec for the TPS is between .23v and .9v. The .67v is a myth. Just get it somewhere between .23v and .9.
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Old Apr 5, 2011 | 10:36 AM
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If you set it on the low end, you can get a low voltage code for the tps. You may also run into issues with hitting WOT and you should check that before you call it done.
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