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Thread: 3 bar map - going lean when fully loaded

  1. #1
    Member badls1's Avatar
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    Default 3 bar map - going lean when fully loaded

    Recently swapped to 3 bar map. Adjusted scalar and can read via scan tool to 255kpa. Went to the track last night and running under 199 kpa, tune is clean and runs well. bumping the boost past 199kpa and I am seeing a huge lean spike and injector duty drops once the car is fully loaded, end of 2nd and after clicking third (th400). I am at 200-204 kpa through first and second gear, but only once shifting to third, with no change in boost I see the lean spike. Fuel pressure is consistent through run. I am using an EFI source old style GM 3 bar map sensor.

    I will attached log and tune files shortly. Below is a screen shot of what I was seeing (AFR is green line). Almost like it pointing to a zero cell somewhere in VE table but there are none.


    Click image for larger version. 

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    1989 Notch l Forged 5.3L l PT91.5 l th400
    SBE 4.8L l S475 l th400 8.62@156 (old setup)

  2. #2
    Joe (Moderator) joecar's Avatar
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    Default

    Post tune/log files.

  3. #3
    Member badls1's Avatar
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    Tune and log files attached

    Base Tune_051416_v3.ctz

    Log_0026.efi
    1989 Notch l Forged 5.3L l PT91.5 l th400
    SBE 4.8L l S475 l th400 8.62@156 (old setup)

  4. #4
    Joe (Moderator) joecar's Avatar
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    What injectors are you running...?

    What power are you making at flywheel...?

    Log injector pulsewidth and duty cycle to see if injectors are running out.

  5. #5
    Member badls1's Avatar
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    Injectors are not running out. There 80lb and fuel pressure is staying constant at 60+psi. Injector duty drops when it goes lean though. Only 60-70% duty. Prolly only making 600 ish flywheel hp.
    1989 Notch l Forged 5.3L l PT91.5 l th400
    SBE 4.8L l S475 l th400 8.62@156 (old setup)

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