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Thread: If you have a MAF and want to calculate VE

  1. #1
    New Member
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    Jul 2003
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    Default If you have a MAF and want to calculate VE

    If you log all your values in these units ( or set up an appropriate conversion)

    MAFFlow in units of grams/second
    RPM as Revolutions Per Minute
    Displacement in units of Cubic Inches
    MAP in units of KiloPascals
    Temp in units of Degrees Centigrade

    You can "log" the VE in real time using the following formula

    VE = MAFFlow * (Temp + 273.15) / (Displacement * RPM * MAP) * 212544

    This will give you your VE in units of percentage.

    It has been suggested that these can be converted to "LS1 Edit" units by multiplying them by 30 - so if you multiply the above formula by 30 you should get values that correspond to what's in the VE table in scale.


    Chris

  2. #2
    New Member
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    Sep 2003
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    i did a calculated pid with the formula that nogo provided and it comes out nice. i can see actual ve on my dashboard now.

    i will make one with your formula and see if its any different.

  3. #3
    New Member
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    Aug 2003
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    Have you had any luck trying this formula, evil? Just checking. Is ther a way to get Live to do the math for you? I see you said that you can see your VE, now.
    Thanks,
    Scott, 2000 SS Convertible: A4, JPR S2 Heads, TR 227/224, PPC Headers, Vig. 3000 Stall, Shift Kit, 3.73\'s, EFILive, LS1 Edit, NX MAF Kit!

  4. #4
    EFILive Developer Site Admin Blacky's Avatar
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    Mar 2003
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    Default

    The VE calculated PID, that ChrisB explained has been included in EFILive V6.1.4 so If you have that version (the latest version) then you should be able to just select the {CALC.VE} PID.
    It will display VE so long as you also select it's dependant PIDs:
    MAP, MAF, RPM and IAT.

    If you have any troubles with any calculated PID, right click on the PID (in the [OBDII (F7)] or [Data (F8)] tab pages and select "More info..." to see what the problem might be.

    Paul

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