Thread: No More ZZP Z7 Turbo Kits...

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  1. #21 Re: No More ZZP Z7 Turbo Kits... 
    GXP Level Member GTPpower's Avatar
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    Quote Originally Posted by Blacknitews6 View Post
    Just my opinion, but the Z3 crossover looks a little restrictive and not as efficient. The Z7 crossover had separate banks that only merged right at
    the turbo inlet. I can see the Z3 is less effective since both banks, all 6 exhaust ports, will actually have to share the same space, in the crossover pipe itself, which can cause the exhaust pulses to hit eachother which will cancel out some of their energy. That might hurt exhaust velocity. I;m sure the Z3 kit will work fine on a mostly
    street setup, but i'll always wonder how much more i could make with the Z7 crossover at the same boost level.
    It makes basically no difference on most of these setups. You don't have 6 cylinders worth of air trying to get into the same space at the same time. It's more like 2-3.

    Pre turbo exhaust size makes almost no difference.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  2. #22 Re: No More ZZP Z7 Turbo Kits... 
    SE Level Member Blacknitews6's Avatar
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    What size is the Z3 crossover? 2 inches correct? So all 6 exhaust ports have to share that small 2 inch pipe?
    And there's no smooth merge, the exhaust gases will fight eachother when trying to enter the turbo. The flange is just welded to
    the side of the crossover. There's no way that crossover will be as efficient as a Z7 crossover or the Cartuning Kit. Meaning at the same boost
    level the Z3 crossover will make less power than a Z7 crossover or Cartuning crossover. Since all the exhaust pulses are forced into 1 pipe
    could cause more boost lag?
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  3. #23 Re: No More ZZP Z7 Turbo Kits... 
    SE Level Member Blacknitews6's Avatar
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    Quote Originally Posted by GTPpower View Post
    It makes basically no difference on most of these setups. You don't have 6 cylinders worth of air trying to get into the same space at the same time. It's more like 2-3.

    Pre turbo exhaust size makes almost no difference.
    So you think the Z3 crossover should make about the same power as a Z7 crossover at 15psi-18psi?
    Then thats not so bad. But does it effect spool time at all? Sorry i'm a worry wart...lol.
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  4. #24 Re: No More ZZP Z7 Turbo Kits... 
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    Quote Originally Posted by GTPpower View Post
    It makes basically no difference on most of these setups. You don't have 6 cylinders worth of air trying to get into the same space at the same time. It's more like 2-3.

    Pre turbo exhaust size makes almost no difference.
    x2 the power level that you're doing wont be hampered by the size of the exhaust ports.
    old setup-Z7 Turbo Kit w/T66, A2A I/C, stock cam & valvetrain/LS1 MAF/Ported 99TB/PowrTuner/AFC/Devils Own/LS1M Scanner/PRJ FP/42# Injs=12.3@118mph street tires -
    (Sold)BACK TO M90 Vs cam w/3.5" pulley/meth/25* timing+bolt-ons
    01 Z28 A4 HP-self-tuned, LTs, FTRA, 3600stall 12.3@112mph
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  5. #25 Re: No More ZZP Z7 Turbo Kits... 
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    Most of the crossover pipe sizes are close to the same, that's not really the issue especially since the turbo is an exhaust restriction anyway. That said I would never install a Z3 crossover. Short of dyno results proving it, I simply cannot believe that a Z7/CT style crossover will not flow and spool significantly better than a Z3. The Z3 kit is the only one that doesn't have smooth merged crossover, and I feel there was a reason for that. Of course, to each his or her own...
    1998 Grand Prix GTP aka The Family Sedan
    CAI, 1.8 rockers, U-bend delete, 3.4 pulley, tuned by me
    1999 Turbo Grand Prix
    L36 turbo build in progress
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  6. #26 Re: No More ZZP Z7 Turbo Kits... 
    SE Level Member Blacknitews6's Avatar
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    I appreciate your help. I just freaked out when i saw the Z7 was discontinued. So now i'm looking forward
    to the Z3 and other mods.
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  7. #27 Re: No More ZZP Z7 Turbo Kits... 
    SE Level Member Blacknitews6's Avatar
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    That's what i was concerned with. The Z3 crossover i knew had to be somewhat less efficient than
    a Z7 crossover. But i'm only looking to run 15psi and with heads, cam and catback i'm hoping to make
    380whp+ I don't want the Stattama kit, so the Z3 in my only choice. I like the Cartuning Kit to, but i'm trying to stick with
    ZZP for my parts. But i have time to think about it.
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  8. #28 Re: No More ZZP Z7 Turbo Kits... 
    GXP Level Member GTPpower's Avatar
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    Quote Originally Posted by Blacknitews6 View Post
    So you think the Z3 crossover should make about the same power as a Z7 crossover at 15psi-18psi?
    Then thats not so bad. But does it effect spool time at all? Sorry i'm a worry wart...lol.
    Power is far more dependant on the turbo than anything else. With the same turbo, you probably won't even pick up a difference on the dyno.

    Spool time is dependant on pre turbo exhaust volume for the most part. If have to do some measuring with each crossover to find which is better.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  9. #29 Re: No More ZZP Z7 Turbo Kits... 
    SE Level Member KShef's Avatar
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    Quote Originally Posted by Blacknitews6 View Post
    That's what i was concerned with. The Z3 crossover i knew had to be somewhat less efficient than
    a Z7 crossover. But i'm only looking to run 15psi and with heads, cam and catback i'm hoping to make
    380whp+ I don't want the Stattama kit, so the Z3 in my only choice. I like the Cartuning Kit to, but i'm trying to stick with
    ZZP for my parts. But i have time to think about it.
    Don't overthink any of it....any kit will make more power than you can effectively put to the front wheels. I have one of the original Stattama prototype kits on my Park Avenue. It uses stock manifolds with a 2" crossover and a 50mm turbo with internal wastegate to a 3" downpipe. Stock motor with blocked off M90 case went 113mph with a race weight over 4,000lbs. Little turbo was all in and couldn't keep up.
    Park Ave, turbo
    13.1 112.9
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  10. #30 Re: No More ZZP Z7 Turbo Kits... 
    GrandPrix Junkie SgtMarshal's Avatar
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    i'm not sure if it's been said, but the cartuning turbo kit with the intercooler is like 3700, and if memory serves, the z7 ran about that with an intercooler
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