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Im currently tuning my brothers 2002 jeep grand cherokee 4.7 5-45RFE. The only issue im currently having is that no matter what I do I cant get the transmission to shift when I command it to. i've raised shift points to from 5,800 to 6,000 rpm and nothing changed. So I changed it to 6,600 rpm and it seems to shift at a lower RPM. I've obviously changed the other parameters with it that could effect it but still nothing. Does anyone know what I could do or if there's something hidden? Thanks!
The 99-04 WJ with the 4.7, has a separate controller for the transmission (TCM). Are you able to access that? What all can you access, as far as shift points and such, on the jtec? I have a 04 4.7 WJ myself, just a offroad toy on 35's, so I've never even thought to have tried plugging hpt into it. I'd do it now, but I have about 35% of the wiring out of it currently.
I have an 04 WJ. You can not change shift points natively via VCM Editor on Release or Beta. I've tried and "trick" and does not change.
If you need a higher WOT Shift point, edit the fuel cut limit and manually shift it.
However, I've fine tuned the Torque Converter lock and unlock to make it drive like a 2010 RAM with a 545RFE, Rapid engage and disengage right where I need it to.
My tranny is modified so results may vary.
Did you raise or lower the delta throttle table to lock to convertor in 3rd and 4th?
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Originally Posted by SonoranTech
can i use mpv13 to tune a 2002 4.0 jeep grand cherokee. i dont want to brick the ecm