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Thread: 4l80E not shifting at commanded RPM or MPH

  1. #1
    Tuner in Training
    Join Date
    Nov 2016
    Location
    Kalamazoo, MI
    Posts
    23

    4l80E not shifting at commanded RPM or MPH

    Hi, I ran into an issue where under higher boost and WOT, the 2-3 shift would bang off the rev limiter at 6600 rpm and feel like its in neutral. I turned the boost down and it didnt have that issue however its shifting at 6600rpm which is basically on the limiter. My tune shows it should be shifting at 6200, i knocked it down to 5800 and no change. I then reviewed the "WOT Shift speed - Normal" and found it should be shifting from 2-3 at 85mph but when i test it, its switching from current gear 2 to 3 at about 6550rpm and 101mph. My 1-2 shift is early also. I did a log of a 1-2-3 WOT pull on 10psi to illustrate whats going on. Combo is a turbo 5.3, stock rebuilt 4l80e with hd2 kit, circle d triple disc converter, 3.55 gears, 28x10.5 tire. Attached are the log and the tune, please review if you have the time. Thank you!
    Attached Files Attached Files
    2010 Camaro SS 6spd
    1979 Mustang - 5.3, 243 heads, Sloppy stg 2 Cam, On3 78/75 turbo, 4l80e, built 8.8