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Thread: zr1 poor throttle response

  1. #1
    Tuner
    Join Date
    Sep 2011
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    Germany
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    196

    zr1 poor throttle response

    hi,

    i have a zr1 with 2,35 pully headers portet heads and 8,5 comp. the car runs fine. now i fitted a big cam. the idle is fine about 950 rpm but when i try to rev up about 20% tps the car stall´s. when i go slow to 1500rpm and then rev up the trotle response is fine ant the car revs up nice.

    any idea what table i have to adjust?

  2. #2
    Sounds like a fueling issue. Whats the AFR read when you do this?
    AAHHHHH!!!!!!

  3. #3
    Tuner
    Join Date
    Sep 2011
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    Germany
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    196
    dont know i have to install my wideband.

  4. #4
    Post a log with wideband hooked up and your tune file and maybe we can get somewhere.
    AAHHHHH!!!!!!

  5. #5
    Tuner
    Join Date
    Sep 2011
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    Germany
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    ok i will do this on monday.

  6. #6
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
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    Roswell, N.M.
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    1,956
    Going lean is what it sounds like to me.
    Gray Ghost- The abomination. 2007 Chevrolet Silverado CCSB. 98mm turbo, nitrous, 428LSX, Rossler 80E with a brake. Finally finished. 23 psi, no numbers, Slow as hell.

    PBM G8- Aluminum 364, twin Precision 67/66 turbos, 6L90 trans swap, CTS-V/Vaporworx fuel system, slowly making progress.

    Dads 2011 CTS-V- Stock bottom end, stock heads, LS9 cam, pullies, ported blower, ported TB, D3 goodies, and lots of nitrous.
    618/618 motor
    906/862 spray

    Caterpillar 50 Forklift- Duramax swap

  7. #7
    Tuner Monty's Avatar
    Join Date
    Apr 2012
    Posts
    173

    poor throttle response when warmed up

    6.0 218/228 525 at cold start up the motor seems to have more power and the throttle response is very nice a simple burp of the throttle will bark the tires but not 5 mins after start up you no longer have this ... note it did seem to do this before motor rebuild and cam install, i cant figure out what the problem is. thought it might be running in open loop tell it warms up and the MAFs was messed up or the VE wasnt tuned right for cam but since it did this before im confused, i set it to run open loop but didnt change anything once it warmed up. need help badly as i am going to install a 408 stroker in the next few months and do not want it to do the same and make it almost impossible to tune. seems there should be a way to trouble shoot whats causing the problem
    Last edited by Monty; 05-06-2017 at 06:16 PM.