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LS6 throttle body upgrade?

This is a discussion on LS6 throttle body upgrade? within the External Engine forums, part of the LSx Technical Help Section category; have an LS6 intake stock on my 02TA. was wondering how big is the factory throttle body, how big of ...

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    suckme sideways andrew69_04's Avatar
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    LS6 throttle body upgrade?

    have an LS6 intake stock on my 02TA. was wondering how big is the factory throttle body, how big of a throttle body will the stock intake fit? and what would a good aftermarket throttle body be that i could put on it? thinkin of putting a throttle body and MAF in when i do my cam swap this winter.

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    sethta
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    Just have your factory throttle body ported and no need for a MAF it won't be a restriction until around 500hp

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    Member jag42420's Avatar
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    2002 WS6 Trans Am

    Your stock throttle body is either 75 or 78mm. The LS6 intakes on our cars (01, 02) are better than the 98-00 LS1 intakes, with a larger plenum volume.

    FAST intakes are 90mm, conduct less heat and advertise 20HP gains over LS1 intake manifolds. The FAST intake is a better intake than our LS6, but will co$t you about $800-1000.

    My opinion, spend $1000 on a set of LS6 heads for a 50HP gain, and upgrade the intake later. You'll get more bang for your buck, and you'll see larger gains from the intake upgrade later.

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    suckme sideways andrew69_04's Avatar
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    ok. also i read when going to a larger cam you should drill out the small hole in the TB to a larger diameter. the cam i went with is slightly smaller then the G5X3. any idea on how big i might need to drill that hole out to?

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    Member jag42420's Avatar
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    2002 WS6 Trans Am

    What cam profile are you installing? If the lift is over .550", then you'll have to install larger valve springs.
    Last edited by jag42420; 12-07-2006 at 12:48 PM.

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    Member jag42420's Avatar
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    2002 WS6 Trans Am

    This might help... http://www.ls1howto.com/index.php?article=23 Especially this part:

    Optional
    Before you reinstall the air intake setup, you may want to drill your TB. This will be a trial and error process that will be different on each car and camshaft combination. If you purchased a very large cam and will be trying to drive it on stock tuning, go ahead and enlarge the hole a little even before we fire it up the first time. The *biggest* hole you should ever have to put in is around 1/4", so start small and work your way up later if you need to (after you've driven the vehicle).

    To remove the throttle body, you'll need to unbolt the 3 10mm bolts holding it to the intake manifold, and also unclamp the 2 coolant lines running to the throttle body (unless you have a coolant bypass).
    Once it is off the car you can drill it. There will already be a hole in the stock throttle body blade. Here we went a few bit sizes up from stock and enlarged the stock opening to a 3/16" hole.

    Clean out any metal shavings from the throttle body after drilling, and reattach the throttle body to the intake manifold (the torque spec is 9lb/ft), and reconnect any coolant lines you may have disconnected.
    End of optional section

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