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Thread: Calc.MAFT: correcting VE and calculating MAF (in single log) --> reverse of Calc.VET

  1. #1
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Default Calc.MAFT: correcting VE and calculating MAF (in single log) --> reverse of Calc.VET

    In-Memory-of-Shawn-Sankey

    This is the reverse of Calc.VET

    This requires the OS to support the pid
    GM.VETABLE_DMA (unless you're SD/MAF-less in which case you're only correcting the VE).



    AIMS:

    Tune MAF/VE tables from idle to redline RPM in a single log session:

    1. Tune both CL and PE/WOT,
    2. Correct VE,
    3. Calculated new MAF from corrected VE,
    4. Eliminate Trims.


    PROCEDURE:

    1.
    Disable MAF: CALC MAFT can be performed Open or Closed-Loop

    A. C2901: MAF High Frequency Fail 1: Change to 1 Hz
    B. C2903: MAF High Frequency Fail Limit: Change to 1
    C. Copy B5913 High-Octane Spark to B5914 Low-Octane Spark
    D. Insure MAF Sensor Circuit is displayed as a current DTC


    2.
    Setup Calculated PIDS:

    calc_pids.txt <--- updated calc_pids.txt file

    Copy that calc_pids.txt file to this folder, or copy/paste its contents to the
    calc_pids.txt file at this folder on your PC:
    My Documents\EFILive\V7.5\User Configuration\



    3. Select the following CALC.VET pids and record a suitable log:



    Note: Keep Channel Count at 24 or less for Fastest Scanning.

    Note:
    CALC.PE has been replaced by CALC.CL.


    4. Apply CALC.VET/MAFT Filter:




    5.
    Paste-with-labels the new CALC.MAFT map into Table B5001 in your tune file:

    ( ignore this step if you're running SD, i.e. ignoring MAF and doing VE table only )



    (to limit the cell display width to something sensible, in the map properties goto the Cell tab and look at Constrain Cell Size)


    6. Paste-multiply-with-labels the new CALC.SELBEN map into Table B0101 into your tune file:



    To display units on a map: go to map properties, on each of the
    Data, Row, Col tabs, checkmark Show Units.


    APPENDIX:


    Read these for more info:

    ( read 1. to gain a better understanding of how Calc.MAFT and Calc.VE are the mirror image inverse of each other )

    1. CALC.VET: A-New-Twist-on-CALC.-VE-Table..Computing-the-Entire-VE-Table.

    2.
    Advanced CALC.VET Summary Notes: Summary-Notes

    3. EFILive's AUTOVE Tutorial for full instructions on SD Tuning procedures (this is outdated):
    AutoVE Tuning Tutorial.pdf

    4.
    How-to-match-wideband-output-to-B3601

    5. Two Methods for Calculating Analog Wideband Lambda


    Credits: (in no particular order):
    joecar (forum moderator) for analyzing/deriving the CALC.VET equation(s) in terms of a log-able pids.
    Weathermanshawn for inventing/exploring the idea of correcting VE and MAF in from a single log.



    Last edited by joecar; February 2nd, 2015 at 08:37 AM. Reason: minor edit to indicate calc_pids.txt file
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #2
    Senior Member Dieselman's Avatar
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    Sounds good. I will be tuning my first LS1 in a few weeks so and this sounds like it would be a handy tool to have


    Cheers

    Ben

  3. #3
    Joe (Moderator) joecar's Avatar
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    I had meant to write this (SELBEN applies any multiplier correction to VETABLE_DMA):

    MAF = {GM.VETABLE_DMA.VE}/{CALC.DAT.K}*{SAE.RPM}*{SAE.MAP.kPa}/15*{CALC.SELBEN}

    (where the VE units are shorthand for g*K/kPa)

    (where CALC.DAT.K is {GM.DYNAIRTMP_DMA.C}+273.15)
    Last edited by joecar; May 26th, 2011 at 08:10 AM.

  4. #4
    Joe (Moderator) joecar's Avatar
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    This method does these things simultaneously:
    - corrects VE table using LTFT and/or wideband,
    - calculates a MAF table from the corrected VE table.

  5. #5
    Joe (Moderator) joecar's Avatar
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    Hi Shawn,

    Here is a preliminary calc_pids.txt file...

    the new pids are CALC.MAFN and CALC.MAFT, these require the pid GM.VETABLE_DMA to be selected, not all OS's have this pid; to keep the pid channel count from going above 24, we may have to delete some other pids (e.g. IAT, ECT, VSS... maybe).

    note that GM.VETABLE_DMA has units [g*K/kPa] this means that CALC.MAFN and CALC.MAFT wil have units [g/s] ("VE" and "gps" respectively in the calc pids file).
    Attached Files Attached Files

  6. #6
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Thanks Joe:

    I'll do a log in the next few days (weather permitting..)..

    Joe, since the MAF would normally be failed, and the Airflow values will be coming from B0101, is CALC.VEN.VE the same as GM.VETABLE_DMA.VE?

    I know the DMA Pids are superior..curious if they are identical?
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  7. #7
    Joe (Moderator) joecar's Avatar
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    CALC.VEN.VE would not be available with the MAF failed, so GM.VETABLE_DMA.VE is a direct lookup of the B0101 VE table (VE = g*K/kPa)...

    i.e. GM.VETABLE_DMA is to VE what SAE.MAF is to MAF...

    [ if you think about this, VE and MAF show symmetry... MAF is indexed by MAFFREQ, VE is indexed by MAP and RPM, they are both looked up in tables ]

    So yes, GM.VETABLE_DMA.VE is what CALC.VEN.VE is (i.e. the uncorrected VE).
    Last edited by joecar; May 24th, 2011 at 11:00 AM. Reason: grammar fail

  8. #8
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Aaahh..Gotcha..

    How about this for Pids..Figured we would not need CYLAIR.DMA?
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


  9. #9
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    ...

    How about this for Pids..Figured we would not need CYLAIR.DMA?
    That pid list looks good... yeah, we don't need CYLAIR_DMA since MAF is disabled, good point.

  10. #10
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Hopefully, I can do some logging tomorrow. I'll start with MAF-enabled just to compare calculations.

    We also got a volunteer (Forum Member), Mr. P who does a lot of SD and SDCL Tuning who can do some logging/testing.

    Once I get a decent log, I'll post up a few more instructions..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
    200cc Heads, 228/232 110+2 Cam, 1 3/4" LT's w/catts, GMMG, Koni Shocks, Hotchkis Springs, 35/21 Sways, 17" ZR1's, 3.90 Gears Roadrunner PCM LM-2 Serial Wideband
    EFILive Closed-Loop MAF/SD Hybrid Tune..


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