Results 1 to 9 of 9

Thread: 2009 ZR1 MAF / Limited to 11500hz?

  1. #1
    Advanced Tuner
    Join Date
    Mar 2008
    Location
    Paris, France
    Posts
    435

    2009 ZR1 MAF / Limited to 11500hz?

    I've tuned a 2009 ZR1 today (pulley/headers)

    On the dyno (5th gear, the 4th was too much for the dyno), the MAF Hz can't pass the 11550hz (@5000 rpm) and then ran pig rich.

    WTF ?
    The Table goes to 15000 !
    Last edited by Brice; 03-16-2012 at 01:33 PM.

  2. #2
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Under the DTC settings, what's the fail hz set at?
    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

  3. #3
    Advanced Tuner
    Join Date
    Mar 2008
    Location
    Paris, France
    Posts
    435
    Quote Originally Posted by IDRIVEAG8GT View Post
    Under the DTC settings, what's the fail hz set at?
    14,500

    Run hard on street (real beast), nothing on the dyno past 5000 rpm ... not enough air on the dyno ? very frustrating ...
    I had a P0106 on the dyno too
    Last edited by Brice; 03-16-2012 at 03:17 PM.

  4. #4
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by Brice View Post
    14,500

    Run hard on street (real beast), nothing on the dyno past 5000 rpm ... not enough air on the dyno ? very frustrating ...
    I had a P0106 on the dyno too
    WTF? Maybe its a simple weak MAF sensor issue. Strange it would stop dead at 11,500hz flat though.

    I assume you're tuning in pure MAF as well.

    Hmmm....
    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

  5. #5
    Advanced Tuner
    Join Date
    Mar 2008
    Location
    Paris, France
    Posts
    435
    Quote Originally Posted by IDRIVEAG8GT View Post
    WTF? Maybe its a simple weak MAF sensor issue. Strange it would stop dead at 11,500hz flat though.

    I assume you're tuning in pure MAF as well.

    Hmmm....
    after 4000 rpm, pure MAF.

  6. #6
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Quote Originally Posted by Brice View Post
    after 4000 rpm, pure MAF.
    Just a shot in the dark but what's your Injector Duty Cycle at when it pukes out?
    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
    Senior Tuner IDRIVEAG8GT's Avatar
    Join Date
    Aug 2010
    Location
    Roswell, N.M.
    Posts
    1,956
    Can't really confirm but it sounds plausible. I can't remember, can you command the Fuel Pressure up anymore via the fuel system section in the tune? If you can get the pressure up and the Duty Cycle down then test it you'll be fine.
    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

  8. #8
    Advanced Tuner
    Join Date
    Mar 2008
    Location
    Paris, France
    Posts
    435
    Update : We ve changed the injectors.
    The ZR1 has gain 100 rwhp and rech 997NM torque on the flywheel

  9. #9
    Advanced Tuner
    Join Date
    Apr 2007
    Location
    Graz, Austria / Europe
    Posts
    283
    there is more in them! My best did 824hp and 1135Nm at crank when blower ist completely maxxed out.

    it is a beast, all you need is 1st and 6th gear, all other gears are purely optionial!