Results 1 to 3 of 3

Thread: 4L80E No WOT 1-2 shift

  1. #1

    4L80E No WOT 1-2 shift

    I am going to try and keep this short. My 2002 Tahoe with 6.0L/4L80e swap would not 1-2 shift at WOT. N/A Gen4 6.0L/97ish 4L80e swapped in. Wired in ISS to appropriate pins at ECU and had support segment swap a 4L80e file for me (had issues doing it that led to support having a to fix). Vehicle drove fine while N/A. Then installed a Turbo and 4.56 rear gear. Upgraded to 2-bar OS and used gear/tire wizard to adjust. Took the vehicle to the track and could not 1-2 shift at WOT. As soon as I let off it will shift. Researched on the forums and it seems a common issue. Adjusted my WOT shift RPMs down in 500 RPM increments and even adjusted WOT MPH down to test also. No amount of adjustment would allow it to shift 1-2 at WOT. After a bit of research and phone calls "technically" I have gotten the vehicle to shift 1-2 at WOT. I set the WOT enable/disable to 100%. Which I believe turned off the WOT tables.. I adjust my MPH the best I could at the time in the Part Throttle tables and it shifts around 6k like we want. Could there possibly be something in the way I segment swapped or OS upgraded that would cause the issue? Is there a table the WOT uses that I cannot see? Or any known issues like this? Although it does work, I am just trying to understand why.

  2. #2
    Senior Tuner SultanHassanMasTuning's Avatar
    Join Date
    Nov 2009
    Location
    All Around
    Posts
    3,149
    with older transmission lets say you want to shift at 6000, its advised to have your shift points earlier i suggest around 5700 so it can have time to catchup especially with the added power
    Follow @MASTUNING visit www.mastuned.com
    Remote Tuning [email protected]
    Contact/Whatsapp +966555366161

  3. #3
    If you read my (and I apologize) wall of text you will see where I said I adjusted the RPM down in 500 RPM increments and it would still bang the limiter.