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Thread: E38 runaway idle when rolling

  1. #41
    Senior Tuner Cringer's Avatar
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    Quote Originally Posted by Alvin View Post
    ... and also considering AIRflow/throttlebody is absolutely the slowest way to control idle...
    Which is why I feel that the throttle P/I controller cannot be used standalone and you need to also copy over the under/over spark adaptives. They are meant to be used in concert.

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  2. #42
    Advanced Tuner
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    All depends on the engine combination. Usually the idle PI(D) controller doesn't have to be as aggressive as OEM just like the spark adapts.

    When you do start going deep into VT models, then the Idle controller definitely has to be adjusted further. It is almost like the OEM took years to calibrate everything to that one engine combination, lol.

    Even injector data is skewed between OS's with no right answers without delving deeper in all the fueling models, which is way beyond me, hah.
    Last edited by ns158sl; 12-02-2024 at 08:45 PM.