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Thread: VGT Tables for E98

  1. #21
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    To confirm increasing the pulse width table between 100 and 120 mm3 and between 120 to 180 MPA puts more fuel in and circumvents the 104mm3 limit that the ECU clearly imposes.
    Howquick, how to you increase this fuel limit ?

    Thanks,
    Mike
    "Just a tune > yeah right !!!! "

  2. #22
    Forum tyhee Site Admin GMPX's Avatar
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    Quote Originally Posted by The Alchemist View Post
    To confirm increasing the pulse width table between 100 and 120 mm3 and between 120 to 180 MPA puts more fuel in and circumvents the 104mm3 limit that the ECU clearly imposes.
    It does Mike but the ECM doesn't know about the additional fuel which will mess with its torque calculations which in turn means the ECM does not know the correct engine torque, it is a common tuning method but I think HOWQUICK is giving a big hint not to go down that path.
    I know HOWQUICK is using just EFILive for tuning the E98 so there is a trick in there somewhere.
    Need official EFILive help, please go here.
    For tuning support please post your questions on this forum (or other auto forums).
    Sorry if I don't respond to your PM, don't take it personal.


  3. #23
    Lifetime Member Dmaxink's Avatar
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    A couple of notes FWIW.

    1. Forget boost pressure. Think actual usable CFM.
    2. Whatever you see the mm3 being in the top of the pulse table - increase your limiters/tune to match that top mm3 value within that axis. Dont tune around it.
    3. Actual torque vs. calculated torque. If this model gets thrown off - shifting and drive ability issue will occur!
    4. Forget the boost number - throw a AFR gauge on it (Considering you do not have manifold air density gauge) and see what what point the boost becomes useless.
    -Kory

    I'm out of ideas? Nah trick... When in doubt, 0xFFFF it out!

    http://www.PPEI.com/

  4. #24
    Lifetime Member Chavez91's Avatar
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    There really isn't much need for a Manifold Air Density Gauge on the ECMs that calculate out the air mass per cylinder. Most ECMs already do air density calculations (including humidity) in the calculation of the air mass per cylinder. (E98 is on that list)

    Plus, air density is an extremely easy calculation to make and add to a custom PID on EFI if you absolutely need it. In basic form its just the ideal gas law.... If you wanna add humidity to the mix, its only just a little bit more math to add to the equation.
    Josh
    '04 LLY
    *L5P, Standalone, Built Trans*
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    '05 LLY
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