Thread: Whats ur max Boost?

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  1. #1 Whats ur max Boost? 
    GrandPrix Junkie SDGTP99's Avatar
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    6.5lbs @ WOT on a 3.4" pulley

    Thats w Open cone HAI, Ported TB, Ported inlet/outled S/C, St2 InterKewler(w/ PCV notch), Ported lim, headers, catless catback, 1.9' modified rockers, zzp tune.

    I think it's probably about time to drop a pulley size.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  2. #2 Re: Whats ur max Boost? 
    The Blue One blueguy's Avatar
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    LOL, ZZP Tune.

    Anywho.

    3.0"...about 11psi~ at the shift.

    Mods: Thrasher Cam, P&P'd Heads, Ported GenIII M90/LIM, LS1 TB setup, LQ4 MAF-Open Cone, Catless Stainless Headers, 3" Catback...idk tons of other junk.
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  3. #3 Re: Whats ur max Boost? 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by bluegtp91 View Post
    LOL, ZZP Tune.

    Anywho.

    3.0"...about 11psi~ at the shift.

    Mods: Thrasher Cam, P&P'd Heads, Ported GenIII M90/LIM, LS1 TB setup, LQ4 MAF-Open Cone, Catless Stainless Headers, 3" Catback...idk tons of other junk.
    Where is all this proof that ZZP tuning sucks?

    Anyway, on topic.

    I see 27psi or so.
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  4. #4 Re: Whats ur max Boost? 
    GXP Level Member boostedcompg's Avatar
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    about 9 psi peak with a 3.3
    04 comp G, front/rear towerbraces, pacesetters, ported sc, LIM, 3.3 pulley, 1.9 mod rockers, Ls1 springs and retainers, custom dyno tune, 180 tstat, shortned dog bones, full poly mounts, zzp shift kit, custom fwi, 28inch cherry bomb, flowmaster 40's. 290whp 380wtq before the button. coldfusion n2o, 60 shot. I haz corvette brakezand gxp cluster! smgpfc028
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  5. #5 Re: Whats ur max Boost? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by darkhorizon View Post
    Where is all this proof that ZZP tuning sucks?

    Anyway, on topic.

    I see 27psi or so.
    Turbo's don't count...honestly since it is in the supercharged section. Also...plenty of people, including me have had issues with ZZP's box tunes...others have not. The OP has had a blown motor...if not more than once.

    So...yeah.
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  6. #6 Re: Whats ur max Boost? 
    GrandPrix Junkie SDGTP99's Avatar
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    Think I'll put a 2.5" on soon as I get the Interkewler filled.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  7. #7 Re: Whats ur max Boost? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by SDGTP99 View Post
    Think I'll put a 2.5" on soon as I get the Interkewler filled.
    Not sure if surius
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  8. #8 Re: Whats ur max Boost? 
    GXP Level Member darkhorizon's Avatar
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    Quote Originally Posted by bluegtp91 View Post
    Turbo's don't count...honestly since it is in the supercharged section. Also...plenty of people, including me have had issues with ZZP's box tunes...others have not. The OP has had a blown motor...if not more than once.

    So...yeah.
    Its every bit of a L67... sorry I dont have a m90...

    Anyway, I would like to see the reasoning other than "blown motor"... Is it too much timing? too lean? To "blow a motor" with a "tune" is requires some extreme mistakes.
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  9. #9 Re: Whats ur max Boost? 
    GrandPrix Junkie SDGTP99's Avatar
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    Quote Originally Posted by bluegtp91 View Post
    Not sure if surius
    Surius as a good custom tune to go w/ the 3.25" pulley.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  10. #10 Re: Whats ur max Boost? 
    Moderator dsmuts's Avatar
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    I've seen 11 at the highest on the 3.4 (trying to lower it). 6.5 on the 3.8. My buddies with a gs said the highest he's ever seen his was 10.3 all stock.
    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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  11. #11 Re: Whats ur max Boost? 
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    i max out the MAP at 200KPA with the 3.0. so im not sure
    2003 SSEi,
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  12. #12 Re: Whats ur max Boost? 
    GrandPrix Junkie SDGTP99's Avatar
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    Whatever you're using to check your kPa should be showing your Boost & or MAP.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  13. #13 Re: Whats ur max Boost? 
    GrandPrix Junkie SDGTP99's Avatar
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    Off topic but I'd like to get a tune from locally jeremey so's I can drop pulley size.
    OverKilled, HAI, Ported Throttle body, Ported intake, ZZP DP, Magnaflow, BMR ta's, GMPP STB's, CCS springs, tinted tailights, roof rails, TEP cool'r, G8 hood. Glass Gearbox.
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  14. #14 Re: Whats ur max Boost? 
    The Blue One blueguy's Avatar
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    Quote Originally Posted by SDGTP99 View Post
    Off topic but I'd like to get a tune from locally jeremey so's I can drop pulley size.
    He is a pretty damn good guy...and tunes great too.

    His GenV, VS car went 12.5's all day long down at WIR a few years ago.
    Sold WBody's: '03 Blue GTP/'98 Green GTP/'98 Silver GT/'05 GXP
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  15. #15 Re: Whats ur max Boost? 
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    Quote Originally Posted by SDGTP99 View Post
    Whatever you're using to check your kPa should be showing your Boost & or MAP.
    ya i use HPT, my point is that the Map is actually Maxed out at about 5500 RPM's while shifting at 6100

    HPT calculates boost at 13.5-14 PSI, but the actual number at the top of the gear is unknown
    2003 SSEi,
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  16. #16 Re: Whats ur max Boost? 
    Because Wet Leaves Hippo Machine's Avatar
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    N/A PSI ftw!


    iLoveSpade
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  17. #17 Re: Whats ur max Boost? 
    Moderator dsmuts's Avatar
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    Quote Originally Posted by Hippo Machine View Post
    N/A PSI ftw!
    I believe it would be 0 lol
    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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  18. #18 Re: Whats ur max Boost? 
    GTX Level Member 98L36's Avatar
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    Quote Originally Posted by Hippo Machine View Post
    N/A PSI ftw!
    ^ ^ ^ Speaks the truth right there!!!
    White '98 GT Coupe - Autopia Fog Housings w/ 4300k HID's + LED Rings
    I Gotz Moar Powar Than U Gotz
    The HWG Thread = Winning.
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  19. #19 Re: Whats ur max Boost? 
    Because Wet Leaves Hippo Machine's Avatar
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    Quote Originally Posted by dsmuts View Post
    I believe it would be 0 lol
    No there no blower so no boost, but there are still psi!


    iLoveSpade
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  20. #20 Re: Whats ur max Boost? 
    Perma-Banned! JK LOL Explicit_Spade's Avatar
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    My POS sees around 10 with a gen v on a 3.4. Because it flows like a bauce.
    Quote Originally Posted by W-Body Store
    Remember, GM engineers didn't take into account your need for speed.
    Daily Driver: 06 Grand Prix GT / 9.4:1 CR / IS3 Heads / Ported Gen V / ZZP Headers / HPT Pro / Pulleys: 4.25, 3.8, 3.5, 3.4, 3.2, 3.0, 2.9, 2.7
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