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Throttle body

This is a discussion on Throttle body within the External Engine forums, part of the LSx Technical Help Section category; I am fixing to put a 250 shot of nos on my 99trans am ls1 and wondering if I'm really ...

  1. #1
    Junior Member
    Join Date
    Aug 2011

    Mystic teal
    1999 Trans Am

    Throttle body

    I am fixing to put a 250 shot of nos on my 99trans am ls1 and wondering if I'm really going to benifit from going to a bigger mm throttle body and is there any good programs out there that will let me
    Change the a/f and timing.

  2. #2
    James Bond Spikito's Avatar
    Join Date
    Aug 2007

    2001 3.8 Black - sold
    2000 SS Black M6

    250 is pretty damn big, youll def be needing a good tune.

    Most people here either get a dyno tune or send their PCM to frost

  3. #3
    Member MudStainKILLA's Avatar
    Join Date
    Dec 2009

    2002 firebird T/A WS6-A4

    do you have any supporting mods for that big of a shot?

  4. #4
    Electrical Engineer KMdef9's Avatar
    Join Date
    Jul 2009
    North of the Motorcity

    Custom Swirly Black
    2001 WS6 M6

    Better throttle response is all, unless the intake is getting upgraded as well, as the air will bottle neck and be limited no matter what, especially with your LS1 intake.

    If your looking to save money, port and polished from eBay will be fine. About $50-75 plus core charge (old TB).

    Otherwise, you can look into some 80mm that run about $200, but I wouldn't go any bigger than that on a stock LS1/LS6 intake.

    And this is all provided you have a LID and smooth bellow as well, IMO. Those mods with a P&P TB (or larger aftermarket TB) complement each other well.

  5. #5
    Super Moderator pajeff02's Avatar
    Join Date
    Feb 2009
    Mansfield, PA

    Black & Blue
    '02 WS.6 / '07 Suburban

    Current engine mods?

    On a stock engine I believe about a 125 shot is as much as you want to attempt if you plan on any longevity.

  6. #6
    Senior Member Lunatikgixxer's Avatar
    Join Date
    Mar 2010
    St Pete, FL

    Bat mobile black
    2000 Trans am WS6 M6

    you would probably need bigger injectors also. Thats a big shot, hopefully you plan on doing a wet shot because a dry 250 shot would be intense on your motor. you would DEFINITELY need a tune, a dyno tune at that to make sure your car is performing good under that amount of nitrous

  7. #7
    Junior Member Potz_Speed's Avatar
    Join Date
    Apr 2011
    Jacksonville, Florida
    99 WS6

    as KM said, your main improvement / gain is going to be throttle response with porting the stocker.

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