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Thread: Need help 3bar SD ignition advance problem

  1. #1
    Potential Tuner
    Join Date
    Mar 2014
    Posts
    4

    Need help 3bar SD ignition advance problem

    Corvette LS1 383 Twin Turbo
    3bar SD with 2.5bar MAP sensor
    15psi boost

    I have a problem when tuning in 3bar SD mode above 8psi. Base spark advance have 15 degrees the reality is 8-13 degrees.
    I turned off the correction:IAT, ECT, AFR, Torque. I have no idea what is wrong.

    Log frame:245-288

    TT sd 3bar RTT 16psi.hpt
    test 16psi.hpl

  2. #2
    Senior Tuner
    Join Date
    Feb 2009
    Posts
    1,931
    Disable spark smoothing and try again, on right side of advance tab under general.

  3. #3
    Senior Tuner Russ K's Avatar
    Join Date
    Dec 2005
    Location
    Regina, Sask.
    Posts
    4,213
    My experience is that you need to disable burst knock on boosted vehicles. The spark smoothing table is active when your foot is off the throttle, so it helps coasting surge/buck.

    Russ Kemp

  4. #4
    Potential Tuner
    Join Date
    Mar 2014
    Posts
    4
    Thank you for your help. Tomorrow will test the new setting, with disable burst knock.