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Thread: can someone tell me what I'm missing here?

  1. #11
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    Quote Originally Posted by joecar View Post
    Also note that to get boost in psi you can do it in a simpler manner: "{SAE.MAP.psi}-14.5038"


    i.e.

    Code:
    *CLC-00-001
    psi           -15.0         30.0          0.1   "{SAE.MAP.psi}-14.5038"
    
    ===========================================================================
    CALC.REALBOOST          F001     CLC-00-001           psi               Performance      "Boost"
    I knew there was an easier way but I've always done it like that because some of the other tables like to have that map in kPa so it's just easier to log it in kPa and adjust it to psi with that formula.

  2. #12
    Joe (Moderator) joecar's Avatar
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    When you log SAE.MAP you have both .psi and .kPa available... (i.e. both units are available for that pid... i.e. both units for 1 pid).

  3. #13
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    Quote Originally Posted by joecar View Post
    When you log SAE.MAP you have both .psi and .kPa available... (i.e. both units are available for that pid... i.e. both units for 1 pid).
    so if you log it in kPa on the chart will the formula for psi still work without converting to psi?

  4. #14
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by 0rion View Post
    so if you log it in kPa on the chart will the formula for psi still work without converting to psi?
    Yes, that is correct.

    On the chart you can display SAE.MAP in either/both of psi or kPa (just from having logged the pid SAE.MAP).

    The scantool provides the Metric/Imperial conversions on each pid.

  5. #15
    Joe (Moderator) joecar's Avatar
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    Here's a calc_pids.txt I found on the forum...

    This is technically more correct since BARO may not always be 14.5psi (100kPa).

    Take note: you can use SAE.MAP or GM.MAP, and SAE.BARO or GM.BARO.
    Attached Files Attached Files

  6. #16
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    Quote Originally Posted by joecar View Post
    Here's a calc_pids.txt I found on the forum...

    This is technically more correct since BARO may not always be 14.5psi (100kPa).

    Take note: you can use SAE.MAP or GM.MAP, and SAE.BARO or GM.BARO.
    cool....this has been very educational. Where does the baro reading come from? I would first think the map but if the engine is running and the map is reading vacuum or boost it wouldn't be able to read atmospheric correct? I'm going to try these back to back this week and see what the difference in readings are. I've just been using 14.5038 because that's 1 bar.

  7. #17
    Joe (Moderator) joecar's Avatar
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    At key-on engine-off, the PCM reads the MAP sensor and saves the value as BARO...

    Then when the engine is running, for N/A engine, the PCM takes note of the MAP sensor value at WOT and adjusts the value of BARO accordingly (after performing sanity checks)... for boosted engine, PCM can't do this.

  8. #18
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    Quote Originally Posted by joecar View Post
    At key-on engine-off, the PCM reads the MAP sensor and saves the value as BARO...

    Then when the engine is running, for N/A engine, the PCM takes note of the MAP sensor value at WOT and adjusts the value of BARO accordingly (after performing sanity checks)... for boosted engine, PCM can't do this.
    thanks for your time and help.....been a pretty educational day here. I'm going to try both of those formulas just to see how different they are.

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