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Thread: 2012 Tundra hits limiter in tow mode WOT after flash

  1. #1
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    2012 Tundra hits limiter in tow mode WOT after flash

    so i bought some credits the other night and tuned my 2012 Tundra, I only adjusted the normal mode(non tow) shift points to hold the gears longer, as well as making the throttle more aggressive in tow mode. The truck now will not shift 3-4 or 4-5 in tow mode at WOT without me letting off. i have gone through all the shift points and convert apply and release but the only thing i can see is the
    trans-hot-tow converter table keeps the converter locked but i don't know why it would be using those tables. any help appreciated.

  2. #2
    Advanced Tuner mbray01's Avatar
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    so by extending the shift, i assume you raised the shift mph/rpm. you likely raised it too high, you cannot raise them to maximum rpm, there has to be time before the rev limiter to allow for it to shift
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    15yr Master Tech.
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
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  3. #3
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    i did not raise any of the shift points, the only thing i did was lower the downshift rpm so it has to rev down further before downshifting because i didn't like that it shifted around so much if i got on the throttle

  4. #4
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    Quote Originally Posted by swinn467 View Post
    so i bought some credits the other night and tuned my 2012 Tundra, I only adjusted the normal mode(non tow) shift points to hold the gears longer, as well as making the throttle more aggressive in tow mode. The truck now will not shift 3-4 or 4-5 in tow mode at WOT without me letting off. i have gone through all the shift points and convert apply and release but the only thing i can see is the
    trans-hot-tow converter table keeps the converter locked but i don't know why it would be using those tables. any help appreciated.
    Your adjustments were made with the understanding the RPM in those tables is output shaft RPM, not engine RPM?

  5. #5
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    no, I assumed it would be input(engine) rpm not trans rpm, also converter output or trans(drivshaft) output?

    for the shift points or the converter lock/unlock or both?

  6. #6
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    Quote Originally Posted by swinn467 View Post
    no, I assumed it would be input(engine) rpm not trans rpm, also converter output or trans(drivshaft) output?

    for the shift points or the converter lock/unlock or both?
    Output shaft RPM for both

    In the future, attaching your tune and a log helps, much easier for everyone to see what's going on

    Here's a quick and dirty spreadsheet to convert to more usable units (engine RPM, vehicle speed) - yellow cells are inputs, green cells are calculated AB60.xlsx

  7. #7
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    Quote Originally Posted by SlowNStock View Post
    Output shaft RPM for both

    In the future, attaching your tune and a log helps, much easier for everyone to see what's going on

    Here's a quick and dirty spreadsheet to convert to more usable units (engine RPM, vehicle speed) - yellow cells are inputs, green cells are calculated AB60.xlsx
    will do, thanks for the help.