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Throttle body question

This is a discussion on Throttle body question within the External Engine forums, part of the LSx Technical Help Section category; on a 1999 trans am, if i got a 85mm throttle body would i need to get a cam or ...

  1. #1
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    1999 trans am

    Throttle body question

    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?

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    Member Bouvers's Avatar
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    Blue 1997 Trans Am(Sold)
    Pewter 2001 Trans Am Vert

    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.

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    Life in the Fast lane sunsetorangess's Avatar
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    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
    2001 SS, Its not the car its the Driver that matters....

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    1999 trans am

    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

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    Grand Imperial Wizard Sarge's Avatar
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    Quote Originally Posted by screamindemon View Post
    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.

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