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Thread: G8 6l80e fine tuning

  1. #1
    Tuner in Training
    Join Date
    Mar 2020
    Posts
    12

    G8 6l80e fine tuning

    I'm hoping to get a little advice / critism on my transmission tune. I also have a few questions for those farmilar with the Blue Cat transmission calculator.

    My g8 (specs bottom) was remotely tuned and the transmission was not happy with whatever was plugged into it. The tuner tried to correct it but too many changes just made things worse, long story short I put the transmission back to stock and made a few modifications based on other threads I saw.

    Modifications:

    1) Disabled TQ management
    2) lowered desired shift times (up and down) to 2.5000, and special shift times to 2.9998
    3) Ran through Blue Cats GUI
    4) increased shift pressure 10%
    5) Copied ramp in pressures from a Diablo firm shift tune from a tahoe

    The transmission shifts fantastic now, I'm very happy. I'm just worried if pressures arent high enough, or some setting I'm missing is causing additional wear and tear or... worse lol. If anyone wanted to review my tune file and give me some advice on additional settings or config I would greatly appreciate it.


    My second part is- some questions tied to Blue Cat input settings

    1) WOT lockup RPM recommendations? Blue Cat has it set to 5252
    2) Default Lock up settings (Min gear, accel gear & WOT gear) default to 3.
    I left it that way but does it make sense to do 2,2,3 ? or even 2,2,2?
    3) Min lockup RPM table defaulted to 1250, I modified it to 1000.
    Is this minimum RPM it will engage lockup at, or minimum RPM it will remain locked? I was considering going lower to like 900


    I know this is a mouthful so I apologize, but really appreciate any feedback/advice.



    Specs:

    2009 G8 GT
    LSA Blower (8 PSI)
    212/224 .550/.550 114 LSA
    2'' headers W/ 3'' stainless exhaust high flow cats
    3.45 rear end
    CTSV converter loosened up (2200 stall)
    Circle D stage 2 transmission build
    Attached Files Attached Files

  2. #2
    so much left on the table.
    Specializing in calibrating GM vehicles. HPtuners and HolleyEFI

    Remote tuning services email [email protected]
    instagram: tunedbymmt


  3. #3
    Advanced Tuner
    Join Date
    Aug 2006
    Location
    Arizona
    Posts
    217
    Turn TQ management back on. Even with a built transmission, I still utilize TQ management with the 6l80. Especially in a heavier car like the G8
    2009.5 PBM G8 GXP M6 W/Roof-Self tune, OBX LTs, Kooks axleback, LSA blower, cam,
    Monster LT1-SC clutch, flex fuel, 12 psi [email protected] 1,800 D.A
    2007 TBSS-Self tune, bolt ons [email protected], 1,900 D.A
    1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A