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Thread: Calc.VET: correcting MAF and calculating VE (in single log)

  1. #11
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    Thanks Joe,

    I should have been more clear.

    I was looking for some clarification on this.

    "Stoichiometric AFR (see B3601)"


    I didn't know if this value should be changed in the calc pid to reflect what's in your tune.

    Brad

  2. #12
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    You can change that. The afr he has is E10 but for gas just change it to 14.63 and you have to go into your tune and make sure your stoich is set to same thing also.

  3. #13
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    That's what I thought.

    Thanks

    Brad

  4. #14
    Joe (Moderator) joecar's Avatar
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    Yes, do everything in EQR.

    Set B3601 to the stoichiometric AFR of the fuel you're using (14.63 gas, 14.12 E10, 9.7 E85...)

    There are gasoline/alcohol content measuring kits cheaply available, they come with a stoich AFR chart.
    Last edited by joecar; January 28th, 2011 at 03:43 AM. Reason: removed reference to CALC.STOICH

  5. #15
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    Thanks guys.

    I'm still learning on the calc pids but that seemed like what you meant.

    Brad

  6. #16
    R.I.P Shawn, 1956-2011 WeathermanShawn's Avatar
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    Brad, though the first two PIDS are good ones to have, technically you only need the following to make the formula work (see attachment). This is part of the R&D still being done, but I appreciate the volunteers who are willing to do it.

    As long as you utilize EQ and pick the GM.EQIVRATIO PID in lieu of Commanded AFR, its as easy as it gets.
    Last edited by WeathermanShawn; January 28th, 2011 at 12:41 AM. Reason: Revised..
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  7. #17
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    Shawn,

    I have used EQR since I started using the software.

    That was kinda what sparked the question.

    Thanks for all your help around here.

    You too Joe.

    Brad
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  8. #18
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by WeathermanShawn View Post
    Brad, though the first two PIDS are good ones to have, technically you only need the following to make the formula work (see attachment). This is part of the R&D still being done, but I appreciate the volunteers who are willing to do it.

    As long as you utilize EQ and pick the GM.EQIVRATIO PID in lieu of Commanded AFR, its as easy as it gets.
    Shawn is correct, CALC.STOICH and CALC.AFR are not needed (they are purely a mental aid for viewing AFR from GM.EQIVRATIO).

    Shawn has simplified his posted calc_pids.txt file above by removing those two pids.
    Last edited by joecar; January 28th, 2011 at 03:47 AM.

  9. #19
    Joe (Moderator) joecar's Avatar
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    Even when using EQR, you still need to set B3601 for the fuel you're running on...

    The PCM does its calculations using EQR, but it still uses B3601 to convert EQR to fuelmass [grams] before calculating injector pulsewidth.

  10. #20
    Joe (Moderator) joecar's Avatar
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    Thanks.



    Paul found a small bug and fixed it.

    I'll be in Jamaica next week (20th wedding anniversary) and I'm hoping to be able to check the internet.

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