Throttle body question

**screamindemon** · 01-15-2009, 08:09 PM

on a 1999 trans am, if i got a 85mm throttle body would i need to get a cam or not. what is a good intake manifold that would go with a 85mm throttle body as well? also is it possible to have to big of throttle body for the stock ls1 cam?

**Bouvers** · 01-15-2009, 09:20 PM

no it isn't... if you want to get an 85mm tb you might as well get a 90mm or 92mm and if you do that you have to match it up to an intake such as the FAST which is $$$ and if you're going to go through that much trouble you might aswell do heads and cam otherwise you're spending $$$ money on a intake/tb and not seeing very many gains for it.

What I would recommend for you is just getting your stock TB ported/polished thats MORE then sufficient for a stock cubed ls1 unless it has h/c

since you have a 99 invest in the LS6 intake match that with your p&p stock tb and you'll be set for just about anything.

**sunsetorangess** · 01-16-2009, 05:49 PM

Unless your pushing upwards of 500hp at the wheels keep your stock throtle body. You can have your stocker ported but i would wait until you decide to get it tunned.
J

**screamindemon** · 01-17-2009, 04:04 PM

so if i get an ls6 intake manifold my stock p&p throttle body will fit right on it right??? also the ls6 intake does not have egr or am i mistaken?? thanks for the help

**Sarge** · 01-17-2009, 05:16 PM

Originally Posted by screamindemon

so if i get an ls6 intake manifold my stock p&p throttle body will fit right on it right??? also the ls6 intake does not have egr or am i mistaken?? thanks for the help

Yeah it will fit...and no it doesn't have EGR...if you need to keep your EGR functional you can get a conversion from Lingenfelter...
http://www.lingenfelter.com/document...ctionsv1.0.pdf

Also I agree....if your under 500RWHP your stocker is good to go.