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Thread: low commanded throttle opening when rock crawling

  1. #1
    Tuner in Training
    Join Date
    Feb 2009
    Posts
    27

    low commanded throttle opening when rock crawling

    I have had an issue where if I roll up to a rock wall and try to climb it the ECM limits power. This is a 2018 Colorado ZR2 with the 3.6L v6 and 8sp. This is happening when I am in low range. I have 4.56 gears installed. I want this to climb the rock wall or spin tires trying and not just sit there. It has done this since the 4.56 gears and Trifecta tune was installed. I have removed the trifecta tune. I now have an unlocked TCM installed also. Can someone point me in the right direction to fix this. At first I assumed it would be something in the torque management but I have not figured it out yet.
    I have attached my tune and a log. In the log file the vehicle was tied to a tree. You can see the TPS goes over 80% but the commanded throttle position stays below 30%. Anyone have an idea for me to try to fix this?

    tset against tree.hpl
    HP 2018 ZR2 3.6 BB .hpt

  2. #2
    Tuner in Training
    Join Date
    Feb 2009
    Posts
    27
    Solved! I had to get aggressive changing the driver demand tables. I was exceeding the axle torque value in the driver demand tables at slow speeds. 0 to 2 mph.

  3. #3
    Potential Tuner
    Join Date
    Sep 2011
    Posts
    9
    Quote Originally Posted by jakesz28 View Post
    Solved! I had to get aggressive changing the driver demand tables. I was exceeding the axle torque value in the driver demand tables at slow speeds. 0 to 2 mph.
    Would you mind posting your tune with the fixed driver demand table?