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Thread: S550 Torque Decel

  1. #1
    Senior Tuner veeefour's Avatar
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    S550 Torque Decel

    Anybody knows what control TQ BASE DECEL in S550 calibrations?

    S197 calibrations have the switch for decel and S550 have only few parameters in IDLE>GENERAL tab like MAX RPM ERROR etc but not sure how those work.

    Once in a while under steady state condition spark source enters tq base decel and cuts the spark to almost nothing - mostly after upshift.

    S550 with procharger.

  2. #2
    Senior Tuner veeefour's Avatar
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    Example - steady state light accel 20% pedal, upshifts nicely trough 2,3,4,5 - enters trans shift mode while shifting.
    On 5-6 shift decides to enter tq base decel even tho pedal input is steady and drops the spark by 10 degrees and you can really feel it.

    example tq base decel.jpg

  3. #3
    Did you ever get clarity with this?

  4. #4
    Senior Tuner veeefour's Avatar
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    Not really, it can be tweaked with torque model but it's still there occasionally.