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Thread: converter will not lock under wot

  1. #11
    Senior Member camcojb's Avatar
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    Quote Originally Posted by IdahoRob View Post
    Jerry yours is trying to lock in 2nd gear, but can't and blows threw the converter until it shifts into 3rd. This is what it looks like to me in the logs. I'll work you up a tcm tune to see about locking the converter on the 2/3 shift.
    I'm not sure how to tell, but I don't think my truck with this converter has ever locked until 4th gear when doing a 1/4 mile run, even before twins. I haven't been able to tell, but the rpms after the shifts on 2-3 never drop below 3400 rpms or so. Only going into 4th does it drop down to 2500 rpms as well as into fifth. Then again I haven't figured out the gear ratios, but it sure doesn't look like mine has ever locked before 4th gear at wot during a 1/4 mile run.

    Jody
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  2. #12
    Junior Member OSUBeaver's Avatar
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    I meant to post this here, not in the other thread

    Looks at the little drop in RPM right before 3rd gear Jody. That's what mine does
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  3. #13
    Senior Member camcojb's Avatar
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    here's mine on the old stock turbo at 12.75 and 108 mph. In third gear the lowest the rpms get is 3400 rpms or so, then it upshifts to 4th and drops to 2500 rpms and the truck flys.

    Click on the image again to get it big enough to read the graph.
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    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  4. #14
    Senior Member camcojb's Avatar
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    ok, tried adding back in torque reduction (50% max) and bumped the minimum tcc duty cycle at 87.5 and 100% tp to 40. Now it always locks. Of course I've said this before, but it appears to be working. I went wot at least a dozen times at all different speeds, in and out of tow/haul, always locked.

    Thanks to Rob and Nick for the help. I guess I should go back and disable torque reduction to see if it was the min tcc table that made the change, or vice versa, or maybe a combo of both. But since it's working I don't feel like changing it.

    Jody
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  5. #15
    Lifetime Member IdahoRob's Avatar
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    Good, glad that worked. Now lets see if I can get Jerry's to do the same thing.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  6. #16
    Junior Member OSUBeaver's Avatar
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    so change minimum duty cycle, not max.....correct?

  7. #17
    Lifetime Member IdahoRob's Avatar
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    The stock LLY/LBZ max duty is at 97% so I can't see how the LMM and LBZ would hurt doing the same. Then change the min. duty cycle to what Jody has. I believe your requested torque is all ready correct Jerry.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

  8. #18
    Senior Member camcojb's Avatar
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    Quote Originally Posted by OSUBeaver View Post
    so change minimum duty cycle, not max.....correct?
    I moved minimum for 87.5 and 100% tp to 40, and then raised max at the same points only 10 numbers to 75 (instead of the factory 65).

    Jody
    07.5 4X CC 2500HD, EFI Live, MBRP exhaust
    new updated website!

  9. #19
    Junior Member OSUBeaver's Avatar
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    So Rob,

    You are saying load the race TCM back in and make the TCC duty cycle changes? Right now, I'm running almost stock..... 89% max torque reduction, the requested torque table is stock, etc.

  10. #20
    Lifetime Member IdahoRob's Avatar
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    The tcm tune I sent you Jerry, not your stock. Hold off for now if you want me to make sure of what you have, doing yard work and getting on here during beer runs, lol.

    I'll work you up a proper tcm tune in the AM.
    2013 LML, 550hp with factory emissions, stock cp4 and compound turbos.
    2002 LBZ, 4x4 (Max'd Out) 6000lbs 9.36 @ 154 mph NHRDA Champion and Record holder
    1965 El Camino, duramax 9.6 @ 149MPH

    All EFI tuned by Adrenaline Truck Performance

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