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Thread: Cool way to tune Idle Air / Angle, MAF etc...

  1. #1
    Senior Tuner CCS86's Avatar
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    Cool way to tune Idle Air / Angle, MAF etc...

    Just thought I would share this as an interesting tool for tuning light load operation like idle, return to idle, low end of MAF curve, etc.

    I think that you need TQ based decel enabled, but not 100% on that.

    Basically, just by editing the values in the "Decel Max Rate Drive / Neutral" way down, you can let the car do an ultra slow reverse RPM sweep. Here are the values I have been using:

    TQ Decel rate.jpg

    Warm the car up and then slowly bring revs up to 2000 rpm, 3000 rpm, wherever you want, hold steady there for a second, then lift quickly from the pedal. RPMs should hold, and very slowly fall back to idle.

    Here's a log. You can see that it takes over 1 minute to return to idle from 2000 rpm:


    Slow reverse sweep.jpg



    On a side note, I tried a bunch of settings trying to tune out the ETC angle oscillation with really no success. I tried:

    • ETC Throttle Angle Derivative Gain
    • ETC PR Filtering
    • Desired Air Mass Estimated Throttle Position Filter Time Constant
    • TQ / INV Tables
    • Spark Proportional Gain
    • Idle Control Enable RPM Error
    • ...and probably more



    It looks worse scaled out to 2 minutes, than it is in real life, but I'd still love to tune it out.
    Attached Files Attached Files

  2. #2
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    i take it u have an auto?

  3. #3
    Senior Tuner CCS86's Avatar
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    Quote Originally Posted by decipha View Post
    i take it u have an auto?


    Why do you say that?

    I have an MT82