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Thread: Calc MAP falls off above 7K RPM_ VCT Timing? Turbo, Gen 1, 6R80

  1. #1
    Tuner in Training
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    Jul 2017
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    Calc MAP falls off above 7K RPM_ VCT Timing? Turbo, Gen 1, 6R80

    Please see datalog from a couple 1/8mi passes this last summer. I have attached a couple of datalogs where the Calc MAP appears to dip or fall off during the run. It is a Gen2 longblock except Gen 1 cams and timing set. Intake cams are L&M Intake Only. Gen 1 Mustang exhaust cams. Turbo is a Summit S475 with 1.32 AR turbine side. Fuel is ID1050X injectors and dual 465lph pumps, Gen 1 6R80, Circle D converter, 2.73 rear gear to combat 4.17 first gear. Two relay transbrake (when used).

    Pass 1- I noticed a MAF dip in 3rd gear which looked strange + MAP dip. 12psi boost
    Pass 2- Just another file with a Calc MAP dip down track. 14psi boost

    Please let me know if you have any suggestions. Thank you!
    Attached Files Attached Files
    Jeremy
    Virginia
    1979 Mercury Capri, Gen 2 Coyote, Gen 1 L&M Intake cams, 6R80, S475 Turbo

  2. #2
    Senior Tuner veeefour's Avatar
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    Oct 2016
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    Your Brake TQ says you are producing only 400Nm - I reckon your TQ Model leaves a lot to be desired.

    Also SD needs adjustments hence you got false interred MAP readings.

    Few more things Id change but...

  3. #3
    Tuner in Training
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    Jul 2017
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    That's very good feedback. It is a work in progress, but you are guiding me in the right direction. Thank you.
    Jeremy
    Virginia
    1979 Mercury Capri, Gen 2 Coyote, Gen 1 L&M Intake cams, 6R80, S475 Turbo