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Thread: LLY hesitation

  1. #1
    Junior Member LarryJewell's Avatar
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    Default LLY hesitation

    I'm looking for some tuning input, Say i'm in traffic going about 40mph and I stab the throttle, there is a hesitation of like about 1 sec., then my truck slingshots forward. The truck is shifting awesome, has great boost, etc, I just would like for it to hammer from the start of the throttle jab without the hesitation, kinda like the LB7 does.

    I'm thinking its one of the maf limiting tables in the fuel injection group causing this, B0751, B0752 or B0728.............I'm thinking they may be set to agressive possibly or is this just a LLY thing we need to learn to live with.

    FWIW, I have tried all kinds of different settings with these tables.

    Maybe the folks at EFI Live could open up a few more tables for the LLY's to play with
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    2004 Duramax LLY, 71.5mm Cheetah turbo, Mike L, Transmission, EFI Live

  2. #2
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    well for what it is worth larr i am tring to go through some of the lb7 tunes that i have to see if there are any tables that we are missing

  3. #3
    Junior Member LarryJewell's Avatar
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    Possibly TBIQ, maybe the transition between 3/4 fuel to full fuel, maybe bring it together tighter.
    2004 Duramax LLY, 71.5mm Cheetah turbo, Mike L, Transmission, EFI Live

  4. #4
    Lifetime Member GMPX's Avatar
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    Default

    What I'd like to see in this thread is the current problem list the LLY tuners are having and then some responses if anyone has cured the problems with what we have available before I go hunting down tables that don't exist.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

  5. #5
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    well ross the biggest problem that i think most of us are having is the way when you punch the throttle the truck doesnt seem to go to full throttle instantly. instead it seems to ramp up. if you are crusiing around town and mash it, it downshifts, and you can literally count "one-onethousand" before it "rolls" in the fuel. Thats a good way to describe it...the LLY's dont fuel hard when you mash it; they "roll" in the throttle.

    i dont know exactly where the fix for this would be. and as far as i know no one has come up with a fix. i think pat and brayden are the closest but still no actuall fix

  6. #6
    Lifetime Member DURAtotheMAX's Avatar
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    here is some wierd LLY stuff.

    It always seems to occur at ~3100rpm. Whats with the defuels.

    SOmetimes it does it, sometimes it doesnt. Sometimes its a violent on/off/on/off defuel, as if im taking my foot off the pedal quickly, then mashing it again, then other times, it just lays down.

    stupid LLY electronics.

    ben
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    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  7. #7
    Lifetime Member DURAtotheMAX's Avatar
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    btw the only consistancy in logging is "driver demanded torque"

    Ross, what tables/things INTERNAL to the ECM can affect/modify the "driver demanded torque" levels/limits?

    Its not my pedal position sensor.

    ben
    2005 Silverado, CC/SB, 4x4, LT, LILLY/Allison
    12.9s @ 108 mph

    many thanks to Ross and Paul

  8. #8
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    i think i see what you are talking about. i see that your mm3 bounces from 105 all the way down to 90mm3. mine does the same thing. i cant figure out why. i also had thought that when we where talking about the way the motor seems to stumble when you stab the peddle that maybe it had something to do with a peddle table that we dont have. perhaps some kind of limiter that doesnt let mm3 go to full on with in a certain amount of time .

  9. #9
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    here is my latest log
    Attached Files Attached Files

  10. #10
    Lifetime Member GMPX's Avatar
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    Ben, thanks for the log.
    As an indication of the problem, would I be looking at frame 1132 - 1168 where the throttle is at 100% but the mm3 is not consistent? particularly 1132 - 1138.

    Cheers,
    Ross
    I no longer monitor the forum, please either post your question or create a support ticket.

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