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Thread: E92 Driver Demand Rate Limits

  1. #1

    E92 Driver Demand Rate Limits

    Can anyone explain the function and purpose of the Increasing and Decreasing Immediate and Predicted Rate Limit Tables? I believe it to be similar to a filtering function on the throttle but I cant find any explanation on them or any info on their calibration. I have poked around a little bit but it's not very scientific and I would like to understand better their function...

    Taps.jpgDITR.jpg

  2. #2
    Senior Tuner
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    It is literally the rate limit at which torque can be added or removed with the gas pedal. Torque can be added or removed using Spark and/or Airmass.

    Immediate refers to ignition timing(spark)
    Predicted refers to Airmass(throttle blade movement)

    The general consensus is to not modify the decreasing rate limit much or you can make the car jerk on decel. Some people max the increasing rate limit, I typically just add 25-50% to it. Some cars, like the file you took a picture of, has increasing rate limit disabled. So changing it will do nothing.
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  3. #3
    Quote Originally Posted by TriPinTaZ View Post
    It is literally the rate limit at which torque can be added or removed with the gas pedal. Torque can be added or removed using Spark and/or Airmass.

    Immediate refers to ignition timing(spark)
    Predicted refers to Airmass(throttle blade movement)

    The general consensus is to not modify the decreasing rate limit much or you can make the car jerk on decel. Some people max the increasing rate limit, I typically just add 25-50% to it. Some cars, like the file you took a picture of, has increasing rate limit disabled. So changing it will do nothing.
    Good info, thank you, I?ll test a bit

  4. #4
    Senior Tuner Higgs Boson's Avatar
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    The disabled drop down typically only applies to Neutral or Idle (0 wheel speed) so changing the table will have an effect while driving, roll over the field and read the description to be sure.

  5. #5
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    Quote Originally Posted by Higgs Boson View Post
    The disabled drop down typically only applies to Neutral or Idle (0 wheel speed) so changing the table will have an effect while driving, roll over the field and read the description to be sure.

    good info, thank you
    [email protected]
    Owner/GM Calibrator
    Gen V Specialist - C7 Corvette, Gen6 Camaro & CTS-V3