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Thread: LS376/480 GMPP in 2012 C6 Grand Sport

  1. 04-01-2019 #1
    C36Maverick
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    LS376/480 GMPP in 2012 C6 Grand Sport

    Replaced stock LS3 due to dropped lifter @ 114K miles with LS376/480 GMPP. Local shop dyno and tune but I'm not really excited with their tune. Idle is very erratic +/- 100 RPMs. Does anyone have a base LS376/480 tune I can compare my file to or better yet advice on tuning a C6? I'm new to tuning with HPT and I don't have much trust in the tuning skills of Northern VA.

    P.S. Not really an issue, but fuel mileage has gone.....
    Last edited by C36Maverick; 04-24-2019 at 01:53 PM.
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  2. 04-02-2019 #2
    Scottgt21
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    Can you post up your tune file? Makes it easier to see why you're having an erratic idle.
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  3. 04-24-2019 #3
    C36Maverick
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    Here are the log and tune files
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