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Thread: Driver Demand vs Gear Question

  1. #1
    Tuning Addict WS6FirebirdTA00's Avatar
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    Driver Demand vs Gear Question

    Is there anything to adjust driver demand vs.gear ratio?

    For example, if I am 50% pedal position and let's just say it is 70% throttle, when it downshifts the higher axle torque is pulling throttle back to say 40% for the same 50% input.

    I have a log of what I am talking about, I just can't find which one it is in.

    I would like to be able to stop that from happening. These driver torque demands are annoying. My brain/foot are calibrated so when I give it 50% throttle I really mean I want the throttle to open 50%
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  2. #2
    Senior Tuner Higgs Boson's Avatar
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    These are torque based controllers, your 40% throttle with a lower gear ratio gives the same axle torque as 70% and a higher gear ratio.

    Of course theoretically to get an auto to down shift you need to increase pedal position so technically you won't have the same 50% pedal input.

    You command a torque with the pedal, the ECM picks a MAP and spark to get there (and if auto it picks a gear ratio also). If the MAP it needs is 40% throttle then that's what you will get.

  3. #3
    Senior Tuner
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    You need to get into the TCM. I was more descriptive in the other thread. You're going to chase your tail trying to get what you want via the Driver Demand Tables.
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