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Thread: KPA MAP to KPA Vacuum

  1. #1
    Tuner
    Join Date
    Apr 2004
    Location
    Keller
    Posts
    113

    KPA MAP to KPA Vacuum

    How do I convert KPA MAP reading from the MAP sensor to KPA vacuum so
    I can tweek the IFR table.

    50 KPA map to 80 KPA = what KPA vacuum?
    2020 Jeep Trackhawk, Functional Demon Ram Air Hood, AFE CAI, SW Headers, SW Cats, Solo Cat back Exhaust.

  2. #2
    Advanced Tuner
    Join Date
    May 2004
    Location
    AUSTRALIA
    Posts
    839

    Re: KPA MAP to KPA Vacuum

    Just take the difference from 101.4kPa, which is 1 atmosphere pressure. So, 50-80kPa MAP would be 51.4-21.4kPa vacuum.

  3. #3
    Senior Tuner
    Join Date
    Nov 2002
    Location
    Central Florida
    Posts
    2,503

    Re: KPA MAP to KPA Vacuum

    Your BARO value is the local zero-vacuum number,
    for those who live at higher elevations.
    BARO-MAP=vacuum. At boost this can be a
    negative value. If the MAP sensor pegs out
    then you may not index correctly across the
    fuel table (or run out of IFR table), among other
    things.