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Thread: LML Will not build over ~22PSI of boost

  1. #41
    Lifetime Member GMC-2002-Dmax's Avatar
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    I am curious if a MAF limiting table might force vane position open more or close vanes down.

    I will have to look at maf closely vs vane %.
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    Tuner of many, many Duramax and Cummins Diesels.


  2. #42
    Lifetime Member Mitco39's Avatar
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    Ive tried maxxing out all the maf tables with no luck. The only bit of response I had were the efficiency table and flow tables.

  3. #43
    Lifetime Member GMC-2002-Dmax's Avatar
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    In all of the ealier LLY, LBZ and LMM tune files we have a min and max vvt % table. In the LML we only have open loop based off mode and with the mode assignments locked out there is no way fo verify mode vs vane %.

    Also temp multiplier tables are missing.

    Rescaling Maf might trick the vane % to close down more.

    Hmmmmm
    www.mscservices.net


    Tuner of many, many Duramax and Cummins Diesels.


  4. #44
    Lifetime Member DURAtotheMAX's Avatar
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    Does modifying the EGR tables have any effect?? In a stock configuration, vane position obviously has a huge effect on how much EGR goes back into the engine. So what if you try maxing out the EGR base flow tables?

    What conditions determine whether the ECM is in "closed loop" or not? Is it basically a coolant temperature/run-time thing like on gas engines?
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
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  5. #45
    Lifetime Member GMC-2002-Dmax's Avatar
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    Once MAF reaches 420+ g/s vanes goto 0%
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    Tuner of many, many Duramax and Cummins Diesels.


  6. #46
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    so maybe it's more than that temp?

    maxing out EGR base flow works? more base flow = less EGR correct?

  7. #47
    Lifetime Member GMC-2002-Dmax's Avatar
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    My 2012 is deleted and blocked, so I cannot tell you how EGR flow effects it at this point because its all non-functional
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    Tuner of many, many Duramax and Cummins Diesels.


  8. #48
    Lifetime Member Mitco39's Avatar
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    I dont think RADustin is concerned about the actual flow, its the flow the ECM thinks its commanding. As long as you block the MAF errors this should trick the computer into commanding and expecting a EGR flow and thus running the tables associated with it.

  9. #49
    Lifetime Member Mitco39's Avatar
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    I had a customer insist on going to H&S after all the issues I been having with the delete and these boosting issues. He confirmed that the H&S is only sitting around 25#s as well. So this is not a specific issue to EFILive, seems to affect all the LMLs. I have heard from a Dmax guy that they were infact using PPEs vane controller to override its control and this is how they have been getting around this issue. I was told that the controller that works on the older ones also works fine on these LMLS.

  10. #50
    Lifetime Member THEFERMANATOR's Avatar
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    Sounds to me like the ECM has a turbo overspeed table that hasn't been found. If at a certain point of flow it keeps going open on the vanes, then the ECM is obviously trying to protect the turbo and over riding the boost tables. Has anybody tried raising the maximum allowable airflow tables yet? From what your seeing, it sounds like it is going 0% right around the point it reaches the peak of the airflow tables from what I can see. I need to get one of these to mess around with now. Looks like I've got the bug to try something new.
    1995 GMC 2500 SUBURBAN powered by 01 DURAMAX/ALLISON, little of this, a little of that,
    DIAMONDEYE 4" exhaust, CORSA muffler, AFE stage 1 dry filter, custom tuning by me, KENNEDY single pump and pump rub kit.

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