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Thread: 07 vete w/ 6l80, 2-3 shifts weird

  1. #1
    Advanced Tuner
    Join Date
    Jun 2015
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    NC
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    201

    07 vete w/ 6l80, 2-3 shifts weird

    See attached datalog. Just trying to help out a friend. Trans parameters should be stock, for whatever reason can't write anything to the tcm which is odd, so everything should be stock there. Its just a bolt on / cam car.

    On the 2-3 shift it feels like like it shifts back and forth multiple times but according to the logs it doesn't. Is there something obvious were missing here in the tune? Or should we be looking at mechanical items?

    Dave
    Attached Files Attached Files
    Last edited by itsdaveonline; 11-25-2018 at 09:57 PM.

  2. #2
    Advanced Tuner
    Join Date
    Feb 2015
    Location
    Perth, Australia
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    974
    have a look at your WOT shift scheduling. your 100% TPS axis in the relating "pattern" including TUTD should be the same values as the WOT tables. pattern A shows a 30% difference between 100% TPS axis in the part throttle shift table and the WOT table.
    your log shows some serious slippage on the 2-3 WOT shift.

    you really need to look at your apply and release of the TCC also. your normal and full throttle tables aren't remotely close to the same and from what I can see it looks like the second its in 3rd gear WOT its trying to jam the lock up clutch in whilst its slipping. I would suggest disabling the TCC all together until youre on top of the shift issue before you smoke it if not already.