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Thread: G8 GT 6l80e help

  1. #1
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    G8 GT 6l80e help

    I'm semi new to HP Tuners and just had a FTI triple disc 2800-3200 Stall torque converter installed and have been having trouble with either my downshift around 40-45mph or my torque converter locking/unlocking around those speeds, one of these things is causing a really harsh jolt during deceleration through the mentioned speeds. Ill post my tune file. Any help will be greatly appreciated.NatesG8AfterTorqueConverter_1.hpt

  2. #2
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    I’m mobile at the moment but I can look at the file when I get home

  3. #3
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    Thanks. Let me know if you need more info

  4. #4
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    Seperate your lock and unlock speeds for 5th and 6th gear. Stock my car did this because the lock/unlock speeds are both set at 42mph
    08 G8 GT LSA
    04 GTP CompG XP cam SOLD

  5. #5
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    Quote Originally Posted by wa04compg View Post
    Seperate your lock and unlock speeds for 5th and 6th gear. Stock my car did this because the lock/unlock speeds are both set at 42mph
    not sure of a way to post screenshots onto this forum, but i changed the 6th lock and unlock 2% higher. Would this be enough?

  6. #6
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    Set your shift speed normal 5th 2mph higher then the apply release for tcc and try 1 mph higher for the normal 6th shift speed above your normal 6th tcc

  7. #7
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    have you tuned this or a shop?

  8. #8
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    For 6th set the 0% apply to 53 and the release to 50. Interpolate or manually smooth it out into the higher % throttle

  9. #9
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    Quote Originally Posted by G8NOOBIE View Post
    have you tuned this or a shop?
    Mixture of both myself and another person, the other person is a much more skilled tuner than myself. Why?

  10. #10
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    Just asking. What all is done to it? There’s certain things I would personally change but depends on mods

  11. #11
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    Quote Originally Posted by G8NOOBIE View Post
    Set your shift speed normal 5th 2mph higher then the apply release for tcc and try 1 mph higher for the normal 6th shift speed above your normal 6th tcc
    Quote Originally Posted by wa04compg View Post
    For 6th set the 0% apply to 53 and the release to 50. Interpolate or manually smooth it out into the higher % throttle
    Is this kind of what you are talking about? SeeNatesG8AfterTorqueConverter_Draft.hpt attached tune file

  12. #12
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    Quote Originally Posted by G8NOOBIE View Post
    Just asking. What all is done to it? There’s certain things I would personally change but depends on mods
    So for mods, all i really have is CAI, muffler delete (previous owner), DOD delete, and Duration 232@.050 Lift .595" cam. What do you see that can be changed?

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    Sent you a pm

  14. #14
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    open your normal and pattern A part throttle shift schedule table next to its respective normal and pattern A TCC apply and release table.

    referencing your first posted file and the "normal" tables your TCC clutch is literally releasing in 4th 1 single MPH before the downshift is being requested. you need more margin than that. 1 MPH isn't enough time to disengage the clutch completely before the downshift commences, especially if you're on the brakes coming up to a stop.

    attached is a stock 6L80E file. compare the shift tables to the TCC apply and release tables and take note of how much margin (time) there is between commanding the events.lara stock.hpt

  15. #15
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    Quote Originally Posted by lukearmstrong1990 View Post
    open your normal and pattern A part throttle shift schedule table next to its respective normal and pattern A TCC apply and release table.

    referencing your first posted file and the "normal" tables your TCC clutch is literally releasing in 4th 1 single MPH before the downshift is being requested. you need more margin than that. 1 MPH isn't enough time to disengage the clutch completely before the downshift commences, especially if you're on the brakes coming up to a stop.

    attached is a stock 6L80E file. compare the shift tables to the TCC apply and release tables and take note of how much margin (time) there is between commanding the events.lara stock.hpt
    Okay, and that leads me into another question. What does pattern A do and when does it take effect? My pattern B is just zeroed out.

  16. #16
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    Usually pattern a is for sport mode. No idea what pattern b does but I just leave mine zeroed out

  17. #17
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    Capture.PNG How does this look?

  18. #18
    Nate, Did you use the bluecat tuning table? If not, it's a lifesaver