At this point I won't spend the dime on an NP241OR, I'm simply trying to increase shift firmness and speed for higher loads / throttle areas
I bought the tool to read the binary off the TCU and started comparing the existing map definitions for the W210 E-class with the ones in the WG TCU.
Some differences seem to exist for the maps related to the shifts.
Wheel perimeter seems important, as a lot of shifting is done based on output RPM, which is calculated from wheel speed. Even factory it's smaller than the factory equipped wheels.
Temperature is easy, the thermistor wire can be read and with an Arduino you could convert and display.
Actual gear is more difficult, it would either had to be read from the comms bus or extrapolated from the solenoid signals.
An Arduino could do both options, the extrapolation being the easiest to get up and running.
Cheap Jeep
