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Thread: 6l80e transmission wont shift

  1. #1

    6l80e transmission wont shift

    09 G8 gt with lsa, 80lb injectors scaled (ifr afr method), 3.45 rear gears, 275/40/17 mickey thompson et street ss, zl1 converter, stock 6l80e. The car makes 750whp and 850wtq.

    Been going to the drag strip multiple times now and having a hard time getting the transmission to shift from 1-2 and 2-3 where I want it to. I tried changing full throttle speed and rpm, used bluecat calculator, tuned, retuned, and it just will not shift unless I take my foot off the gas pedal really fast and reapply. As a result i just cant break into the 10's when i know my car is capable enough. I've tried changing things here and there in the tune like pressures and shift times but something doesnt seem right. I've compared my tune with others in the repository and tried making changes but of course I dont know what im doing in the auto tcc tab or when it comes to messing with the torque factor adders and inertia profile. If someone can help me out and explain that to me or if anyone can help me make changes that would be awesome. This is a track only car so I dont care how it drives! I just want it to shift and shift on time at 6500rpm!!!
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  2. #2
    any thoughts?

  3. #3
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    overfilled the trans?
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  4. #4
    just recently filled it and made sure i did it properly so i dont suspect under/overfill

  5. #5
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    put an extra 1.5 quarts in it. if you're running that fast on stock fill levels. its sucking the pan dry.
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  6. #6
    wont that cause pump cavitation? how does the extra power cause the transmission to suck more fluid?

  7. #7
    Senior Tuner
    Join Date
    Apr 2007
    Posts
    1,104
    load, angle and shear force. i start running into this issue about 600whp with the 6l80. it will not cause an issue as it is a known problem and this is a cure for it. it's not a tune problem.
    The most hated, make the most power.
    93 Ranger. 5.3 D1X. 1069hp.

  8. #8
    ok, ill see whats up. thanks

  9. #9
    Advanced Tuner
    Join Date
    Jun 2011
    Location
    Montreal, Canada
    Posts
    758
    Should overfill by 1 quart. Also make your full throttle shift speeds match with the part throttle 100% colums. Personally not a fan of turning off the upshift TM, but some do it with success.
    2007 Corvette C6 Vert. A6
    LME LS402, Pat G custom cam, ATI 10% OD Damper
    Circle D triple disc 2600, 3.42 Diff
    YSI, 3.0 pulley, ID 1000's
    Alky Control Meth,
    ARH 1 7/8 headers,
    1009 RWHP @ 7000, 817 RWT @ 6000