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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; I was Looking at maybe buying a new throttle body for my car and was wondering if the 85mm BBK ...

  1. #1
    Junior Member 99CANADAHAWK's Avatar
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    Throttle Body Question ?

    I was Looking at maybe buying a new throttle body for my car and was wondering if the 85mm BBK TB , will it fit with an SLP bellow or should I go for the 80mm .
    I later plan on swiching to an LS6 Intake & don`t plan on doing anything crazy with my car other than bolt ons .
    Thanks .
    1999 T/A FIREHAWK - SLP Lid & Bellow,LT`s & Catted Y & Power-Flo Catback , MSD & NGK , UMI 3P SFC,ADJ PHB,STB,LCA`s & Relos , Eibach Pro Kit , Bilstine/SLP Shocks , MAC Diff Cover , BFG & OE Wheels C5DD 18x9.5/10.5 , HID 8000K Headlights - Dyno`d @ 319.07 HP & 327.23 Ft-lb ( Tuned by Champ Motors )

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    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    Buy a ported/modded stocker.

  3. #3
    formally 01 T/A 0verkill's Avatar
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    "Arrest Me Red"
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    sent your stocker to mark at www.s2performance.net and have him do his thing.

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    Junior Member BluBeaSSt's Avatar
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    Yes don't waste your money on a 80. Just have your stock one ported or go find a core stock TB and have it ported.

    If your gonna upgrade get a 90 +

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    Junior Member 99CANADAHAWK's Avatar
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    OK , so now I guess I have two options :

    I Can have my stock TB Ported or

    I will save up some more money and buy an 90mm

    So if I do wait an buy the 90mm will it work with an LS6 intake ? & will it fit with my SLP intake bellow ?
    Thanks Again .
    Last edited by 99CANADAHAWK; 01-10-2009 at 06:17 AM.

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by 99CANADAHAWK View Post
    OK , so now I guess I have two options :

    I Can have my stock TB Ported or

    I will save up some more money and buy an 90mm

    So if I do wait an buy the 90mm will it work with an LS6 intake ? & will it fit with my SLP intake bellow ?
    Thanks Again .
    if you go with a 90mm tb you will need to get a 90mm intake.
    ls1/6 intakes he a three bolt mount, ls2/fast/bbk have a 4 bolt mount

  7. #7
    Member Bouvers's Avatar
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    Blue 1997 Trans Am(Sold)
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    thats affirmitive... 90/92 and I thought I heard something about a 100mm tb... its not as easy as buying a 300$ 4 bolt tb you need to spend 1000$ for a FAST intake to marry it to

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    cutting and welding mark21742's Avatar
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    Quote Originally Posted by Bouvers View Post
    thats affirmitive... 90/92 and I thought I heard something about a 100mm tb... its not as easy as buying a 300$ 4 bolt tb you need to spend 1000$ for a FAST intake to marry it to
    fast has a 102mm now i think its for the ls7

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    Member supaxero's Avatar
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    metallic pewter
    2000 Trans Am WS6

    OK, I'll ask the dumb question. What is porting and how does it work

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    Impounded
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    I am looking to do that too.
    I want a good intake and throttle body

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    Impounded
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    Quote Originally Posted by supaxero View Post
    OK, I'll ask the dumb question. What is porting and how does it work
    The best explaning I can give is removing metal in the throttle body and making it smooth to flow more air.

    Here is the example. When someone has asthma their airways restrict and make it hard to breath, porting is kinda like an inhaler, it makes the airways open up and more air to flow in.

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    formally 01 T/A 0verkill's Avatar
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    Quote Originally Posted by JoshieDoom View Post
    The best explaning I can give is removing metal in the throttle body and making it smooth to flow more air.

    Here is the example. When someone has asthma their airways restrict and make it hard to breath, porting is kinda like an inhaler, it makes the airways open up and more air to flow in.
    this is right and if you go to the like i posted up you can find a befor and after shot of one and you can realy see the defrece.

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    Impounded
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    79 T/A -91 Firebird
    1998 Trans Am -Oynx Black

    This is my friends ported and this is my stocker(Which he ported later.. lol)



    Half Shaft mod, Bump stop mod, and ported.

  14. #14
    formally 01 T/A 0verkill's Avatar
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    "Arrest Me Red"
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    mark will smoth out the big open space on the top left. and the scrues on the bar.

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    Member supaxero's Avatar
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    metallic pewter
    2000 Trans Am WS6

    So would it be beneficial to port a larger throttle body (85 or 90) compared to porting the stock? I'm not sure if there is a point of diminishing returns.

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    what is the bump stop mod

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    Impounded
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    79 T/A -91 Firebird
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    Quote Originally Posted by 99TransAmSLP View Post
    what is the bump stop mod

    From stock the blade can only open at like 85 degrees, this allows it to open a full 90 degrees

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    Impounded
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    can you tell me what to do?

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    Sold: LS1 '85 El Camino ls1camino's Avatar
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    Quote Originally Posted by 99CANADAHAWK View Post
    OK , so now I guess I have two options :

    I Can have my stock TB Ported or

    I will save up some more money and buy an 90mm

    So if I do wait an buy the 90mm will it work with an LS6 intake ? & will it fit with my SLP intake bellow ?Thanks Again .
    The outside diameter of the 90mm and stock (78mm) throttle bodies are the same...4" (102mm). The inside diameter is different, which is what is measured (78mm or 90mm). So yes, the SLP Smooth Bellows will fit.

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    Junior Member 99CANADAHAWK's Avatar
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    Quote Originally Posted by ls1camino View Post
    The outside diameter of the 90mm and stock (78mm) throttle bodies are the same...4" (102mm). The inside diameter is different, which is what is measured (78mm or 90mm). So yes, the SLP Smooth Bellows will fit.
    Awasome So I can attach an 80 or 85mm TB to my Bellow !
    Now witch one would be best for the LS6 intake ? if I go that route is the 85 too big ?

    Thanks.

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