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Thread: Timing the LMM

  1. #1
    Lifetime Member killerbee's Avatar
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    Default Timing the LMM

    Trying to get on the road to improving LMM economy, and timing is essential in the methods I use. But it seems to be a bit of a mystery.

    Quote Originally Posted by camcojb View Post
    ...different conditions use different tables and nobody that I know of has exactly determined when one is used over the other, although B seems to be used the most, at least at low altitude normal ranges.
    Is this still a mystery? Not sure how anyone can effectively tune a vehicle without knowing which timing table is used.


    Quote Originally Posted by camcojb View Post
    ...I haven't seen a tune yet that moved the timing on the pilot. I do

    ...As far as altitude, I believe that low altitude is seal level up to 3500-4000 feet or so. Medium is from there to 7000-8000 feet (a guess, the words used were "like Mt Everest" which is much higher than 7000-8000 feet!).
    Where does this reasoning come from, or observations?
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
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    Lifetime Member killerbee's Avatar
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    Thanks, I will do that.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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    Lifetime Member killerbee's Avatar
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    status is build 83. But I don't see any of my questions addressed in it?

    ???

    I still don't see any operational distinctions in the various timing tables.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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    Senior Member camcojb's Avatar
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    Quote Originally Posted by killerbee View Post
    Trying to get on the road to improving LMM economy, and timing is essential in the methods I use. But it seems to be a bit of a mystery.



    Is this still a mystery? Not sure how anyone can effectively tune a vehicle without knowing which timing table is used.




    Where does this reasoning come from, or observations?
    this is an old quote............... The info I mentioned came from an EFI Live tuning seminar I attended over a year ago. Still don't know the cutoffs for the low/med/high altitudes. The timing tables tell what they're for in the description at the bottom of the page when you click on a certain map. For example, A is used when no pilots are active. B is used when only pilot #1 is active, C is with pilot 1 and 2 active, D is with pilot 1 and pilot 3 active, and E is with only pilot 3 active. I don't believe EFI Live had that description when I posted that info a year ago. Fortunately they are constantly discovering new tables and info, so we benefit.

    You can monitor the injection status via the scantool PID - GM.MAINTSEL_DMA

    Don't forget the numerous correction tables that interact with those maps.

    Jody
    Last edited by camcojb; March 22nd, 2009 at 03:24 PM.
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
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    Lifetime Member killerbee's Avatar
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    Hi Jody,

    Realizing the LMM is a "work in progress", it is difficult enough to try to modify timing without needing an enigma device. I guess we are stuck with constantly changing timing tables, for now. Would love to be a able to log a single pid that shows which table to refer to.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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    Senior Member camcojb's Avatar
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    Quote Originally Posted by killerbee View Post
    Hi Jody,

    Realizing the LMM is a "work in progress", it is difficult enough to try to modify timing without needing an enigma device. I guess we are stuck with constantly changing timing tables, for now. Would love to be a able to log a single pid that shows which table to refer to.
    the pid I listed above is supposed to be the one that tells you which table it's using. You apply any corrections from those tables and it should line up.

    GM.MAINTSEL_DMA

    Jody
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  8. #8
    Lifetime Member killerbee's Avatar
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    this is what i get. Nothing that says what timing chart I am on at any given time. You have to do the correlation in your head using logic rules, and its a PIA.
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    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
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  9. #9
    Senior Member camcojb's Avatar
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    Quote Originally Posted by killerbee View Post
    this is what i get. Nothing that says what timing chart I am on at any given time. You have to do the correlation in your head using logic rules, and its a PIA.
    you're correct. I just did a log to check, it'll tell you whether the pilot is active or not, and which pilot it is, so from there you have to figure out A through E. Would be nice if it just gave that letter, but it's better than nothing I guess.

    Jody
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  10. #10
    Lifetime Member killerbee's Avatar
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    It is.

    But with it changing constantly, you don't know whether you are coming or going. i suspect somebody will do some kind of logic pid, I just lack the time to figure out the right nomenclature.
    Michael, Systems Engineer 04.5 D-max LLY, Phoenix, Arizona Email
    Custom Tuning Services
    DURAMAX/CUMMINS ECM's TCM's for sale, all years, 20% wholesale discount available
    EFILive's first VGT "Software Wastegate Tune"

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