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Thread: Theory for tuning part throttle iginition timing - torque based

  1. #1
    Advanced Tuner
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    Theory for tuning part throttle iginition timing - torque based

    Could you tune part throttle ignition timing on these platforms by monitoring torque?

    I think you could.

    In the torque model, the factors include airflow and spark. In order to reach a certain "torque" more throttle would be required as spark is reduced. Conversely, as spark is advanced to MBT throttle commands would be reduced.

    So logging spark advance, tps, desired and commanded torque (and KR) could show you how far away you are from MBT...?

    The question is will the change in spark advance tables offset the torque model and skew the commanded torque data?

    If in doubt, multiply everything by 1.1.

  2. #2
    Senior Tuner
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    May 2016
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    You would be comparing to an MBT model that's been configured in the tune so would just be working to get closer to it and not necessarily actual MBT. Best thing I could think of is maybe using fuel trims but with neural network not sure how accurate that would be. If using Speed Density and you change timing to make the engine more efficient you will typically find it will lean it out some too.

  3. #3
    Senior Tuner
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    Another point to add to this is cam timing. Move the cam position around and you'll see the results in fueling if it's getting more or less efficient with your change.