Thread: gt top speed

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  1. #1 gt top speed 
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    i have a 98 grand prix gt..if i get an overkill pcm and a cat back. what will the top speed be. i love killing cobalts, but once i hit 106 its gay.

    thanks alot
    nick
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  2. #2 Re: gt top speed 
    GrandPrix Junkie Sabrewings's Avatar
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    130-140 range would be my guess, if that's your only mods.
    2004 Impala LS - got some mods sold!!!
    2009 Subaru Impreza WRX STI

    NAIOA moderator Still Imp'n, just in a different Imp.
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  3. #3 Re: gt top speed 
    club of used to own a gp 99prixgt's Avatar
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    had mine in the 140 range but it was pretty scetchy with the tires i had on it.
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
    99 silvermist gp gt-g5/xp/IC/3.0mps-parted&sold
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  4. #4 Re: gt top speed 
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    did u have any mods when you went 140, besides a tune or PCM?
    04 Grand Prix GTP (Wizaired, 3 inch downpipe)
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  5. #5 Re: gt top speed 
    club of used to own a gp 99prixgt's Avatar
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    zzp DP, SLP exaust, 180* t-stat, Wizard (I think thats all i had at the time) and of course the overkill tune.
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
    99 silvermist gp gt-g5/xp/IC/3.0mps-parted&sold
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  6. #6 Re: gt top speed 
    SE Level Member 2001camaroB4C's Avatar
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    Quote Originally Posted by 99prixgt View Post
    had mine in the 140 range but it was pretty scetchy with the tires i had on it.
    Wow, ballsy ive gone a bit faster then that but that was in my Camaro with a tire rated to like 190 or something. I personally dont think I would go any faster then 110 in my se.
    2001 A4 Camaro B4C, 1.94 60ft - 8.48 1/8@84.13 - 13.17@104.29, should go faster with a better track and no ses light.
    And now a 98 Grand Prix
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  7. #7 Re: gt top speed 
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    mine just shuts down at like 106!
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  8. #8 Re: gt top speed 
    Donating Users chrisb's Avatar
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    256 is the limit in the pcm when modified. good luck hitting that! (108 stock)
    99 Grand Prix old build- CAI, Custom exhaust, HV3, Stage 2 TB, custom tune, ported heads intense s1x cam, headers.
    Nothing great Just a small T66 Turbo with a Hv3 On a stock tranny untill i finish the other one.
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  9. #9 Re: gt top speed 
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    106 is what i said and that was said is in a round about way could be 104 or 105... its somewhere right there... it will do that with no problem it just then starts shutting off and on until you slow down. (SORRY)
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  10. #10 Re: gt top speed 
    GT Level Member flynn's Avatar
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    I hate the governor in our cars. I'm pretty sure just stock we'd be good up to 125 if not for the fuel cut-off.
    Signatures suck!

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  11. #11 Re: gt top speed 
    GrandPrix Junkie Sabrewings's Avatar
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    Governors are set to the speed rating of the stock tires. Not just because the engineers felt like laughing at you every time you tried to go faster than that.
    2004 Impala LS - got some mods sold!!!
    2009 Subaru Impreza WRX STI

    NAIOA moderator Still Imp'n, just in a different Imp.
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  12. #12 Re: gt top speed 
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    Quote Originally Posted by Sabrewings View Post
    Governors are set to the speed rating of the stock tires. Not just because the engineers felt like laughing at you every time you tried to go faster than that.

    idk im sure they find it funny when all of sudden the car just cuts out. i would if i was racing someone. that reminds me i need to set my cousins to like 60 or sumthin then race him.
    lol
    99 Grand Prix old build- CAI, Custom exhaust, HV3, Stage 2 TB, custom tune, ported heads intense s1x cam, headers.
    Nothing great Just a small T66 Turbo with a Hv3 On a stock tranny untill i finish the other one.
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  13. #13 Re: gt top speed 
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    rockers would be nice with headers,i used a dhp 1.0 in mine with no tuning and it was good,i had to upgrade to an intense pcm and a good tune after the blower was installed
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  14. #14 Re: gt top speed 
    SE Level Member pontiacgp759's Avatar
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    you said you like beating cobalts... will our gt's ..i repeat G T beat a cobalt ss supercharged? while im at it, how about integra gsr's and civic si's
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  15. #15 Re: gt top speed 
    SE Level Member DemonGP's Avatar
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    Mine tops out with my mods at 120 and I havent seen many GP beat any GSRs or Civic SI there crazy fast.
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  16. #16 Re: gt top speed 
    SE Level Member DemonGP's Avatar
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    but that was also down hill lol so technically 110 max
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  17. #17 Re: gt top speed 
    Donating Users Nickell's Avatar
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    cobalt ss supercharged will murder us, but as for gsx and si's it depends on the years.
    1998 GP Daytona - PLOG, 104's, PRJ Wires, Lucas 42.5's, DHP 1.0 Tune, DP, Full Borla, GPO's, Roof Rails, Gen 2 Spoiler, 04+ Needles, Menards Intake, 3.5 Pulley, SSC Springs, Corn-fed
    2000 Bonneville SSEI - 212k+, New Gaskets and Stuffs
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  18. #18 Re: gt top speed 
    SE Level Member DemonGP's Avatar
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    My buddy's got 06 Cobalt LS Turbo GT28 turbo that thing rapes SS all day long I bet you could hold up with SS Supercharged there really not as fast as ya think.
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  19. #19 Re: gt top speed 
    club of used to own a gp 99prixgt's Avatar
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    Im dead even with my friends 08' civic si stock (14.7 in the quarter), get him from a stop a little but then he catches up and passes me. As far as pre gen civic's, they are all worthless garbage granted they aren't fully built and turboed but, not for long hehe
    16' wrx sti- stock
    06 Spice Red GTO- m6/exhaust/tune/suspension/377whp-383tq-sold
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  20. #20 Re: gt top speed 
    Donating Users Nickell's Avatar
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    Wondering what my 2000 GT would do now?
    Its got a slp cai, overkill pcm, cat back exhaust w/ cutout, and a few internals.
    *FYI: Car was dyno'd at 223 hp before pcm,slp, and exhaust upgrades*
    With those upgrades i was told to expect 245-250 hp?

    Im thinking high 130's or mid 140's...?
    1998 GP Daytona - PLOG, 104's, PRJ Wires, Lucas 42.5's, DHP 1.0 Tune, DP, Full Borla, GPO's, Roof Rails, Gen 2 Spoiler, 04+ Needles, Menards Intake, 3.5 Pulley, SSC Springs, Corn-fed
    2000 Bonneville SSEI - 212k+, New Gaskets and Stuffs
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