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Thread: 4.0T Tune; Underboost or HPT?

  1. #1
    Tuner Only6NoTricks's Avatar
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    Sep 2022
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    4.0T Tune; Underboost or HPT?

    Ive been chasing this issue for some time now, and after replacing near every gasket, im still chasing this underboost issue. Car demands 37psi and only sees 30 max. Any clues/tips? Torque request and everything seems on point as well
    R6 Refined.hpt
    Proper Logging.hpl
    Last edited by Only6NoTricks; 03-31-2025 at 12:07 AM.
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  2. #2
    Tuner in Training
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    Mar 2021
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    Tune: Wastegate Actual Stroke Position and Wastegate Spring Constant Pressure

  3. #3
    sent you a pm

  4. #4
    Senior Tuner Norris Motorsports's Avatar
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    Mar 2006
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    Your ECTs seem way too low for any kind of boost to occur. I haven't seen your file but it definitely looks like a safety option.

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