Thread: 03 GP 3.1 Throttle body

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  1. #1 03 GP 3.1 Throttle body 
    SE Level Member ssgtarivera's Avatar
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    From what Ive learned on just this site alone has been great.
    I assume my GP has the larger 3400 intake and wanted to find out what the stock throttle body size was and if a small upgrade could be bolted direct to the manifold without porting.
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  2. #2 Re: 03 GP 3.1 Throttle body 
    Moderator dsmuts's Avatar
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    It's most really worth doing any upgrades to a 3100 it will still be painfully slow. If you upgrade your Tb you'll need to tune for it.
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
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  3. #3 Re: 03 GP 3.1 Throttle body 
    GrandPrix Junkie dpzelenak's Avatar
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    Not ture^^ if you just put a 3400 tb on it, the 3400 tb is like 58mm and the 3100 is like 54-55mm i think(not 100% sure but its close). You say you think it has a 3400 intake? are you talking about the manifolds? or just the tb?

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  4. #4 Re: 03 GP 3.1 Throttle body 
    SE Level Member ssgtarivera's Avatar
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    I think both upper and lower are 3400 due to the year. Is that correct or is there a way to be sure?
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  5. #5 Re: 03 GP 3.1 Throttle body 
    GrandPrix Junkie dpzelenak's Avatar
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    what does the top of the motor say itll say 3400 or 3100

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  6. #6 Re: 03 GP 3.1 Throttle body 
    GXP Level Member ctracer's Avatar
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    it has the 3400 upper manifold.
    07 Black GXP.
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  7. #7 Re: 03 GP 3.1 Throttle body 
    GrandPrix Junkie dpzelenak's Avatar
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    3400 upper mani without a 3400 tb?

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  8. #8 Re: 03 GP 3.1 Throttle body 
    GXP Level Member ctracer's Avatar
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    Quote Originally Posted by dpzelenak View Post
    3400 upper mani without a 3400 tb?
    i believe so.
    07 Black GXP.
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  9. #9 Re: 03 GP 3.1 Throttle body 
    SE Level Member ssgtarivera's Avatar
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    Thanks guys. Thats exactly my thought too
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  10. #10 Re: 03 GP 3.1 Throttle body 
    GrandPrix Junkie dpzelenak's Avatar
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    wait what, im confused? you have a 3100 all stock but it has a 3400 upper manifold and a 3100 tb?
    oh i was wrong the 3400 tb is 4mm bigger then the stock one, the 3100 tb is 52mm and the 3400 stock tb is 56mm

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