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Thread: 6.6 gas l8t tunning

  1. #1
    Potential Tuner
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    Jul 2023
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    6.6 gas l8t tunning

    Has anyone tuned the new 6.6 L8T gas engine yet in the Silverado or Sierra trucks yet? If so what kind of power are you getting out of it.

  2. #2
    Senior Tuner Ben Charles's Avatar
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    Aug 2009
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    Roughly same power gains as 6.2 l86? the compression hurts them just a tad, but I like them

    Email Tunes, Bencharles_10@hotmail.com
    96 TA Blown/Stroked, 4L80E/Fab 9
    15 C7 A8 H/C 2.3 Blower/PI
    14 Gen 5 Viper
    Custom Mid Engine chassis, AKA GalBen C

  3. #3
    Potential Tuner
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    How much HP? I would like a little more HP on my 6.6. I have never seen the HP gains on the 6.2.

  4. #4
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    Do you think it is worth tunning?