V-10 Killer

iTrader: (22)

I finally got back to the track this year after a few years off, and no matter what I did in the WOT shift MPH/RPM tables, the car would shift early on the 1-2, way early on the 2-3, and early on the 3-4 (while locking the TCC at the shift).
The car has a vendor built 4L65E, and a TCI 3800 stall converter.
I commanded the shifts at 6600 rpms, but the car was shifting at 5000.
No matter where I set the shift MPH, it would still shift at 5000 rpms.
Every thing I found searching was mentioning the TPS voltage triggering a "limp-home" mode. So I checked. 4.28-4.33V at 100% throttle.
Is there anything else in the PCM that could override shift tables and not throw a code? This has been haunting this car since 2006, and I'm fed up with it. I wanna race!
I'm going to start building a 4L80E for the car, and use a TCI trans controller when I finish. I wonder if I should wire the controller to my current trans and see if it's a PCM issue, or if the tranny could be it.
Before I go through all that trouble though, does anyone have any ideas as to what could be causing it? Anything would be helpful at this point

69LT1Bird

iTrader: (1)

The TPS voltage seems low. Log the Trans Shift Mode PID and see if it says Normal Shift WOT in the scanner.

MUSTANGBRKR02

iTrader: (91)

You can also try to zero out the mph table so it shifts at rpm only. That will elimanate a transmission related problem.

V-10 Killer

iTrader: (22)

I'll try those two, thanks for the ideas

jimmyblue

iTrader: (11)

That voltage seems like it might be below the WOT TPS%
that the PCM keys on, to use the WOT tables. Is the TPS%
recorded in the scan tool 95% or better at WOT?

V-10 Killer

iTrader: (22)

On the runs I logged before my PCM fried, I was getting 92-96% for the duration of the 1/4 mile. I don't think I ever see a true 100%. I haven't logged anything new since I got the new PCM installed last wendsday.
I'll try to make a run and log the TPS voltage.
Why do they have to make it such a pain lol
I'm within range of the lower and upper fault thresholds, and reading >90% TPS...
What would be the fix for this if it's not reading high enough? Without overshooting the 4.75V rule anyway.

moehorsepower

iTrader: (3)

The LT's had what was called the "Stall Wall" but I never heard of it on an LS, I guess you could try the same method and see if it works...