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

  1. #51
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Joe, you will have to help me out a little on the decoding...

    The only issue I recall, is that when the car first starts up..EQ reads >1.00, but you are not in PE Mode..or closed-Loop..
    2002 Black Camaro Z-28 M6 Hardtop 11.0:1CR 425HP/410TQ SAE (400TQ@3500RPM)
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    EFILive Closed-Loop MAF/SD Hybrid Tune..


  2. #52
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Quote Originally Posted by joecar View Post
    There is a PE/enrichment bit in one of the TSTATE pids, it appears to not correspond to actual PE active... I meant to log this some more;

    (and what is it doing in a transmission TSTATE pid).
    Well, here were a couple of logs I did with TSTATE5..Seemed inconclusive, but maybe I missed something....Is that one you needed?
    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..


  3. #53
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    Joe, you will have to help me out a little on the decoding...

    The only issue I recall, is that when the car first starts up..EQ reads >1.00, but you are not in PE Mode..or closed-Loop..
    Hey no worries, I'll like swimming in the math...

    Quote Originally Posted by WeathermanShawn View Post
    Well, here were a couple of logs I did with TSTATE5..Seemed inconclusive, but maybe I missed something....Is that one you needed?
    I look at those on my other PC later.

    It seems that all the single channel pids that could yield a useful indicator don't work...

    we might have to either use EQIVRATIO (which we already log, so it is for "free") or also use FUELSYS (which uses up 2 pid channels).

  4. #54
    Joe (Moderator) joecar's Avatar
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    Hi Shawn,

    Attached here is a new calc_pids.txt which replaces CALC.PE with CALC.CL just as we discussed today.


    Edit: I found an error due to my editing skills (== should be =), so I corrected and re-attached the file.
    Attached Files Attached Files
    Last edited by joecar; July 6th, 2011 at 12:46 PM.

  5. #55
    Joe (Moderator) joecar's Avatar
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    Update: Shawn has updated the calc_pids.txt file in post #1.

  6. #56
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    @joecar, could you please rewrite
    "{SAE.MAF.gps}*({GM.DYNAIRTMP_DMA.C}+273.15)/{SAE.RPM}/{SAE.MAP.kPa}*3445.2/displacement()"

    with more parenthesis, right now i'm a bit fuzzy on order of operations, especially the MAF/MAT/RPM/MAP...and then is the whole thing *3445.2/VOL, or just the MAP?
    or better yet put it all on one division line, so there is no confusion, like ( a * b * c) / (d * e * f)?

  7. #57
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by redhardsupra View Post
    @joecar, could you please rewrite
    "{SAE.MAF.gps}*({GM.DYNAIRTMP_DMA.C}+273.15)/{SAE.RPM}/{SAE.MAP.kPa}*3445.2/displacement()"

    with more parenthesis, right now i'm a bit fuzzy on order of operations, especially the MAF/MAT/RPM/MAP...and then is the whole thing *3445.2/VOL, or just the MAP?
    or better yet put it all on one division line, so there is no confusion, like ( a * b * c) / (d * e * f)?
    Hi Marcin,

    It follows the usual left-to-right associativity rules...


    • being the first factor places that factor in the numerator;
    • * preceding a factor places that factor in the numerator;
    • / preceding a factor places that factor in the denominator;


    i.e. the / preceding a factor means invert the factor and multiply to the current product;

    so think of a*b*c/d/e/f as a *b *c /d /e /f which is same as a*b*c/(d*e*f) or (a*b*c)/(d*e*f).


    So the whole thing is *3445.2/VOL.

  8. #58
    Joe (Moderator) joecar's Avatar
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    Default i.e.

    a*b/c*d = a*(b/c)*d

    a*b/c*d/e = a*(b/c)*(d/e)

  9. #59
    Joe (Moderator) joecar's Avatar
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    Here is an alternate calc_pids.txt file that separates DAT out as a separate pid: calc_pids.txt

    This file has pids for both the Calc.VET and Calc.MAFT tutorials.

  10. #60
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    Quote Originally Posted by joecar View Post
    Here is an alternate calc_pids.txt file that separates DAT out as a separate pid: calc_pids.txt

    This file has pids for both the Calc.VET and Calc.MAFT tutorials.
    Link does not work - shows:
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