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Thread: Help With The Math

  1. #1

    Default Help With The Math

    Turns out to change from kPa to PSI, it's telling me to change the math in the settings. Anybody understand what I need to do?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
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    23,691

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    Holley EFI software:
    First program the MAP sensor in kPa. Then if you prefer it displayed in PSIG,
    click Toolbox (top Toolbar) and select Preferences & "Display MAP as PSIG".
    http://forums.holley.com/showthread....4437#post64437 (MAP kPa to PSI Equivalents - Read end of post #2.)

    Holley Digital Dash:
    http://forums.holley.com/showthread....4985#post74985 (Read post #7.)
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  3. #3

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    OK, got that figured out, works good. Shows 13.9 at a idle, which is because it's a MAP sensor. I wonder if there is just a way to have a boost gauge that will read just zero with key on and show vacuum while idle, then show boost as it's made? Like a normal pressure/vacuum gauge?

  4. #4
    Join Date
    Nov 2013
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    Chicago IL
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    Quote Originally Posted by procharged67 View Post
    OK, got that figured out, works good. Shows 13.9 at a idle, which is because it's a MAP sensor. I wonder if there is just a way to have a boost gauge that will read just zero with key on and show vacuum while idle, then show boost as it's made? Like a normal pressure/vacuum gauge?
    What exactly are you looking at?
    A MAP sensor should read 0 PSI (or 100 kPa) at key-on. engine not running.
    If you change the values in the software as Danny mentioned, it changes all tables from kPa values to PSIG.
    0 kPa = -14.5 psi
    100 kPa = 0 psi
    200 kPa = 14.5 psi
    300 kPa = 29 psi

    If you are looking at the Digital Dash, it's as simple as multiplying kPa by 0.14503, and then subtracting 14.503 to get back to 0 (use the Multiplier and the offset).
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