Results 1 to 4 of 4

Thread: 60E 1-2 shift pulls 20* timing, yet shows no TM active

  1. #1
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
    Posts
    7,448

    60E 1-2 shift pulls 20* timing, yet shows no TM active

    Does this look weird, or normal?

    Stock 4L60E, mostly stock tune. I haven't messed with shift timing or pressures yet. I did try adding and subtracting TM (+/- about 40%), didn't notice any change. Both abuse mode tables are untouched. Yes, that horrible 1.0 second shift duration is on the to-do list.

    Timing goes from 18* to -1.x* during the shift while showing 'none' for both TM types. The advance & retard graphs don't change when the timing is being pulled. What's causing it?

    edit: 'Desired Trans Torque' drops from 12 to 0 when it happens, that's the only change I can see.
    Attached Files Attached Files
    Last edited by blindsquirrel; 03-10-2019 at 05:06 PM.

  2. #2
    Tuning Addict 5FDP's Avatar
    Join Date
    May 2012
    Location
    Rogers, MN
    Posts
    13,533
    Timing removal of shift is normal, helps the transmission out.

    Going down to about zero is perfect if you ask me.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
    Posts
    7,448
    So... if Spark TM Type showed 'trans' in the list when the timing drops, I woulda said "Oh, good! TM is working." But it stays on 'none'. Am I logging the wrong thing?

  4. #4
    Tuning Addict blindsquirrel's Avatar
    Join Date
    Apr 2017
    Location
    Meridian MS
    Posts
    7,448
    Added a bunch more TM, reduced shift time, increased pressures a bit. Now it's able to complete the shift before the timing comes back up. Feels soo much better.
    Attached Images Attached Images