fast 90 throttle body questions

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Apr 5, 2006 | 03:52 PM

98transguy

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From: new hudson,mi

fast 90 throttle body questions

just got fast 90/90 combo installed on car. tried to start car today and it has trouble getting it to idle. have to give it gas for a few seconds before i can let go and have it idle. does it every time after i shut off car and try to start it again. i heard something about drilling a hole in the blade of the throttle body? could this be a reason it wont idle? opinions?
thanks guys

Apr 5, 2006 | 04:27 PM

CRL 01 SS

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From: Hoover, Alabama

You need to drill the hole bigger in the TB blade to let more air into the engine at idle.

Apr 5, 2006 | 04:28 PM

98transguy

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From: new hudson,mi

what size does it need to be drilled out to? and if they know this problem why doesnt fast drill the hole larger to begin with?

Apr 5, 2006 | 09:14 PM

Detroitmuscle

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From: Shelby Twp.

Drill a small hole, can be even smaller than the one in the stock TB and you should be fine.

Apr 5, 2006 | 09:21 PM

TryingT/A

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That seems like the problem with fast. The suction over the blade causes the blade not to close while the car is running. Some drill a hole, some mess with the screws. Slow Trap resolved his issue by putting on a return spring on the t/b. Someone did that but couldn't get 100% throttle due to a heavy spring.
I would resort to drilling last. will post the link if I find it

Oh yeah, hole size drilled is usually 1/8 inch like the stock (I think)