Thread: 3.4" vs 3.25" pulley

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  1. #1 3.4" vs 3.25" pulley 
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    Iv been reading a lot about supercharger pulleys on the forums but cant decide what the best route is to take. Should i get a 3.4" pulley with new plugs, ubend delete, intake, thermostat, pcm, and down pipe? or should i get a 3.25" pulley with all of the above plus new headers and will that be safe to do?
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  2. #2 Re: 3.4" vs 3.25" pulley 
    GXP Level Member ctracer's Avatar
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    get the 3.4. get headers with it. anything below will require more modding.
    07 Black GXP.
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  3. #3 Re: 3.4" vs 3.25" pulley 
    Moderator dsmuts's Avatar
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    Definitely 3.4
    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
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  4. #4 Re: 3.4" vs 3.25" pulley 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Read up more on modding before you buy anything.

    Sounds like you are going off of what ZZP says for this information.

    Exhaust first, then add air. While scanning the whole time.

    SMGPFC Member #1
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  5. #5 Re: 3.4" vs 3.25" pulley 
    Moderator dsmuts's Avatar
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    I meant 3.4 with headers
    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
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  6. #6 Re: 3.4" vs 3.25" pulley 
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    Isn't the safely modding thread required reading?

    if not. it SHOULD BE. this is all addressed in that thread. read, absorb...

    ...then ignore it anyways like most people...
    SMGPFC Member # 569 - Mad Monkey Approved!

    New Ride - 2012 CTS-V Coupe 6spd - Black/black, Recaros. Stock for now.
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  7. #7 Re: 3.4" vs 3.25" pulley 
    GrandPrix Junkie NegativeOne13's Avatar
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    You can usually find headers for a little more or same as DP. Might as well get headers, and have a better flow.

    And smile it's Blacktooth Grin!
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  8. #8 Re: 3.4" vs 3.25" pulley 
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    okay thanks. I will most likely go with a 3.4 and just get headers when i can. after this what should i do besides going with a smaller pulley. what else can i do to gain power?
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  9. #9 Re: 3.4" vs 3.25" pulley 
    GrandPrix Junkie NegativeOne13's Avatar
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    Headers first. One of the biggest restrictions for these engines is the exhaust manifolds. Need more exhaust out before you can add more in. And for power gain.... it all depends on what you want to do, and how deep your pockets are. Anything outside of 3.4" you are talking cam and so on. So the price to safely and effectively run more mods after 3.4" goes up quickly.

    And smile it's Blacktooth Grin!
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  10. #10 Re: 3.4" vs 3.25" pulley 
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    1.9 rockers are cheap

    or intercool it...

    or both..... all depends on how mch mony you have
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  11. #11 Re: 3.4" vs 3.25" pulley 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Read the modding thread in the general tech section.

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  12. #12 Re: 3.4" vs 3.25" pulley 
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    ok ill check out the modding thread. if i got a 3.4" pulley and did all of the supporting mods including headers and an intake what kind of torque/hp gains can be expected?
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  13. #13 Re: 3.4" vs 3.25" pulley 
    GXP Level Member ctracer's Avatar
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    from what ive seen...youll have 230-245 whp with a good tune.
    07 Black GXP.
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  14. #14 Re: 3.4" vs 3.25" pulley 
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    did u mean 330-345hp?
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  15. #15 Re: 3.4" vs 3.25" pulley 
    GXP Level Member ctracer's Avatar
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    Quote Originally Posted by Slideways22 View Post
    did u mean 330-345hp?
    no.
    07 Black GXP.
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  16. #16 Re: 3.4" vs 3.25" pulley 
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    Quote Originally Posted by Slideways22 View Post
    did u mean 330-345hp?
    That kind of power isn't easy with a supercharger
    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
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  17. #17 Re: 3.4" vs 3.25" pulley 
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    stock gtp comes with 250 at least.. did u mean 230 additional hp?
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  18. #18 Re: 3.4" vs 3.25" pulley 
    GrandPrix Junkie NegativeOne13's Avatar
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    250 crank hp..... ~200 wheel horse power. And no.... maybe 30-45 additional hp on top of the factory wheel depending on certain factors.

    So say ~230whp on the bottom side.

    And smile it's Blacktooth Grin!
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  19. #19 Re: 3.4" vs 3.25" pulley 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    From the factory the Grand Prix GTP (97-03) have 240 Horsepower and 280 FT LBS Torque.

    Minus the drivetrain loss and your at 200/250 to the wheels.

    Do those mods for a 3.4 setup and you might be 230/280-290 to the wheels.

    SMGPFC Member #1
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  20. #20 Re: 3.4" vs 3.25" pulley 
    GXP Level Member ctracer's Avatar
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    Quote Originally Posted by Slideways22 View Post
    stock gtp comes with 250 at least.. did u mean 230 additional hp?
    nope, i only meant that right now you make about 240 at the crank. maybe. so that means about 190-195 to the wheels.
    with a 3.4 pulley and supporting mods, you will make about 230-240 to the wheels. so that means about 280 to the crank.
    07 Black GXP.
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