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Thread: lambda instead of afr

  1. #1
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    Default lambda instead of afr

    So I want my logs to display lambda instead of the afr I am currently displaying. From what I have been reading I need to do the following:

    Open the calc_pids.txt file

    Edit the working CLC-00-002 0.0 2.0 .2 "{CALC.AFR_WBC1.AFR}/{GM.AFR}

    To the new CLC-00-002 0.0 2.0 .2 "{CALC.AFR_WBC1.AFR}/{GM.AFR}/14.7

    Is this correct?


    W~

  2. #2
    Joe (Moderator) joecar's Avatar
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    No... if both numerator and denominator are AFR based, then the stoich AFR cancels out (if they assume the same stoich AFR).

    If the wideband assumes a different AFR (say 15.2) than the PCM (say 14.6) then the correction factor becomes:
    "({CALC.AFR_WBC1.AFR}/15.2) / ({GM.AFR}/14.6)"

    which simplifies to:
    "{CALC.AFR_WBC1.AFR}/{GM.AFR}/15.2*14.6)"
    Last edited by joecar; January 30th, 2014 at 04:40 PM.

  3. #3
    Joe (Moderator) joecar's Avatar
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    There are two problems with GM.AFR:
    - GM.AFR is based on table B3601 in the calibration file,
    - I have seen GM.AFR not get updated (compare with GM.EQIVRATIO in a log);

    so I like to use GM.EQIVRATIO instead of GM.AFR...

    noting that GM.EQIVRATIO equals 14.7/GM.AFR (i.e. 1/lambda), then your correction factor becomes this:
    "{GM.EQIVRATIO}*{CALC.AFR_WBC1.AFR/14.7"

    assuming your Wideband Commander assumes stoich to be 14.7 (check your WBC user manual to see what default stoich AFR is).
    Last edited by joecar; January 31st, 2014 at 12:17 PM.

  4. #4
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    Joecar,

    I tried to build it and I got this :

    Error report generated by EFILive at 12:45:22 on Jan 31, 2014

    Error code: ERR_CONFIG/92
    C:\Users\Documents\EFILive\V7.5\User Configuration\calc_pids.txt(54): List index out of bounds (4).

    EFILive Version: 7.5.7 (Build 245)

    Platform: Windows NT
    Version: 6.1 (build 7601)
    Processor type: Pentium 1397MHz

    Directories
    Temporary Cache: C:\Users\Documents\EFILive\V7.5\Temporary cache
    Logged Data: C:\Users\Documents
    Customers: C:\Users\Documents\EFILive\V7.5\Customers
    Configuration: C:\Program Files (x86)\EFILive\V7.5\Configuration
    Exported Data: C:\Users\Documents\EFILive\V7.5\Exported data
    Images: C:\Users\Documents\EFILive\V7.5\Images
    Sounds: C:\Users\Documents\EFILive\V7.5\Sounds

    I have attached a copy of my calc.pids.txt

    W~
    Attached Files Attached Files

  5. #5
    Joe (Moderator) joecar's Avatar
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    Try this (I corrected your file).
    Attached Files Attached Files

  6. #6
    Joe (Moderator) joecar's Avatar
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    I replaced this:
    *CLC-00-006 0.5 1.5 .4 "{GM.EQIVRATIO}*{CALC.AFR_WBC1.AFR}/14.7"
    factor
    with this:
    *CLC-00-006
    factor 0.5 1.5 .4 "{GM.EQIVRATIO}*{CALC.AFR_WBC1.AFR}/14.7"

  7. #7
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    Thank you!!!

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