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Thread: Throttle Closure, what am I missing

  1. #1

    Throttle Closure, what am I missing

    Got a 2015 Z06 with a 2650 and Nick Williams TB.
    The system commands the throttle to close to around 70% as it approaches redline. I've zero'd the accel threshold, and increased the driver demand with no change to the behavior.
    It's going to be something dumb, but I'm not sure where else to look for the limiting factor.

    Thoughts? Suggestions?

    2650 Tune 03X.hpt2650 80mm Dyno 03.hpl

  2. #2
    Quote Originally Posted by Proxses View Post
    Got a 2015 Z06 with a 2650 and Nick Williams TB.
    The system commands the throttle to close to around 70% as it approaches redline. I've zero'd the accel threshold, and increased the driver demand with no change to the behavior.
    It's going to be something dumb, but I'm not sure where else to look for the limiting factor.

    Thoughts? Suggestions?

    2650 Tune 03X.hpt2650 80mm Dyno 03.hpl
    Looks like you are hitting torque limits. Also, your lowside is dropping too low and you are commanding too lean of AFR for pump gas.
    Last edited by 1scls1z; 03-02-2024 at 09:27 AM.

  3. #3
    Which torque limit specifically?

  4. #4
    Senior Tuner
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    The ECU is calculating way too much torque and probably hitting the peak torque limit. Best way to fix is to lower the calculated torque. Airmass and Virtual Torque tables both effect the final calculated torque output.
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3

  5. #5
    Quote Originally Posted by Proxses View Post
    Which torque limit specifically?
    Peak torque limit. Your Torque model is increased quite a bit and is likely exceeding the peak torque limit table as Jason mentioned.

  6. #6
    Ah, so all of them... Ha.
    Ok, I'll give it a shot.

  7. #7
    That was it. All good now. Thank you!