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Thread: 2013 Impala 3.6 LFX - Overkill 87 tune - audible pre-igniton under power

  1. #21
    Advanced Tuner
    Join Date
    Sep 2021
    Posts
    475
    Im sure this is much more powerful with the cam timing back to stock, the dyno showed 2-3hp gains with very small increments of adjustment. This was at 6-7k rpm with only losses shown at lower rpms.

  2. #22
    Tuner in Training
    Join Date
    May 2018
    Location
    Seattle
    Posts
    15
    The VVT change back to stock has it running noticeably smoother.

    Power seems about the same. Maybe pulls up the steep hill with less effort, need to drive it more.