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Thread: 6l80- keeping converter locked with small throttle changes

  1. #1
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    Jul 2018
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    6l80- keeping converter locked with small throttle changes

    2015 GMC Sierra 5.3/6l80
    Coan triple disc 3600stall
    Pro charger


    Im having an issue with my 6l80 and triple disc where if Im cruising down the road, converter locked, and I go from say 30%tps to 28% tps, the converter will lock and unlock, sometimes float/slip/surge when it starts to re-lock.

    I increased the regulator offset from 26 to 40 and I cant feel a difference or see a difference in pressures in the logs.

    Im hesitant on modifying the apply ramp table because it seems more of a decel issue.

    Slip tables are all at 0

    Does anyone have an idea of what to modify to keep the converter locked in these conditions?
    Last edited by dburt86; 2 Weeks Ago at 02:30 PM.

  2. #2
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    I’d also like to add that the converter does now slip under any amount of load once it’s locked. I can see in the logger it increases TCC pressure as load increases, even though the slip is always at 0, so that indicates to me that there’s a table somewhere that’s defining that (tcc line pressure vs tq) but I cannot find it. All I can find is the apply ramp table. Maybe increasing the 0rpm slip column would help?

  3. #3
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    At this point, ive changed the regulator offset to 90 and the gain to 1 and ive added to the apply ramp. No change.

    To get around the "annoying-ness" of it, I moved the tcc engagement up so its only locked at 50mph and above, after that, you just have to know how to drive it. Super annoying.

  4. #4
    post tune or no one will help'