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throttle bodies

This is a discussion on throttle bodies within the External Engine forums, part of the LSx Technical Help Section category; Thinking about getting an bbk 85mm intake manifold. What is the stock size throttle body for a 98 ls1 ta ...

  1. #1
    Junior Member herelizerd's Avatar
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    98 trans am

    throttle bodies

    Thinking about getting an bbk 85mm intake manifold. What is the stock size throttle body for a 98 ls1 ta ?.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    IIRC it's 78mm

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    ^^ Sounds right.

    Personally, I would recommend a stock LS6 over a BBK intake.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    :yep: Nothing but nightmares in fitment.

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    Moderator 98TransAmWs-6's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    :yep: Nothing but nightmares in fitment.
    I had a 96mm Professional Products intake which is similar to the BBK and I sold it for a FAST 102 because the fitment was horrible on it and it required rtv just to not leak around the injector ports, runners, etc. I would highly suggest a LS6 intake if you don't want a FAST 102 over the BBK.
    1998 Trans Am WS6 - Phantom
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    If I had to go aftermarket, then it would be the new FAST 92 mm that comes in black... but only if I could get myself to swallow the $900 plus price tag.

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    Waiting on the Tree transamtom's Avatar
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    Quote Originally Posted by pajeff02 View Post
    If I had to go aftermarket, then it would be the new FAST 92 mm that comes in black... but only if I could get myself to swallow the $900 plus price tag.
    Yeah anything bigger on stock cubes is a waste.

    For value nothing beats a used LS6 intake,300 bucks for 15hp.
    pajeff02 likes this.
    2010 Camaro SIM 2SS/RS A6
    1999 TA A4 NBM
    12.265 at 110.52mph

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    Junior Member herelizerd's Avatar
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    throttle bodies

    what would be a good suggested throttle body for a stock ls6 intake ?

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    Junior Member herelizerd's Avatar
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    I wiped out a wrist pin the motor was pulled and had to do a small bore to a 353 to fix the damage. added a set of long tube headers and a 3" y pipe . if any of that helps in directing me In the right direction on the intake manifold and throttle body

  10. #10
    Junior Member herelizerd's Avatar
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    also made a custom aluminum pipe to replace the accordion style plastic tube connecting the ram air box to the motor

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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by herelizerd View Post
    what would be a good suggested throttle body for a stock ls6 intake ?
    S2 Performance, I'll pm the link to you. I got there S3 TB and haven't regretted it since.

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    Still running the stock TB on ours. I see a lot of guys running Nick Williams without any complaints or issues.

  13. #13
    Junior Member herelizerd's Avatar
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    black
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    throttle bodies

    also will I need to replace the mas for a larger TB

  14. #14
    Waiting on the Tree transamtom's Avatar
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    You can pick up good ported TB's on Ebay cheap.

    Look for the place that has a chick with a big rack holding the TB or PM me for the name.

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    Stock MAF will support up to around the 500 hp level. Most people use a Fernco adapter to mate the MAF to the larger throttle body while others delete the MAF completely and run a speed density tune.

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    Junior Member herelizerd's Avatar
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    Ok so I ran across a great deal and snagged a bbk ssi 85mm intake with a matching 85mm bbk throttle body and a jet 85mm maf with new intake gaskets still sealed in box that was bought for a build till they had money problems got it all for $600

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    ^^ Pics of the install, please, when it happens.

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    Quote Originally Posted by herelizerd View Post
    Ok so I ran across a great deal and snagged a bbk ssi 85mm intake with a matching 85mm bbk throttle body and a jet 85mm maf with new intake gaskets still sealed in box that was bought for a build till they had money problems got it all for $600
    I've got the BBK intake, installed it about a year ago. No leaks but I did run into issues with the coolant lines under the intake. Since it was a Saturday night and I had no time to get the LS6 conversion parts I made my own. Basically had to eliminate the pipes that go under the intake. I tried to smash them down flatter, still would not clear. I think they also shorted me some fasteners. Don't forget to loctite the fasteners on the bottom of the intake, I hear they can come loose.

  19. #19
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    BTW I called BBK and complained, figured their engineers might want to know. They offered me some lame discount on my next part.

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