Quote:
Originally Posted by rube2112
This bus doesn't shift between gears until you hit 2200 rpm. I want it to shift much much lower than that. And any other mileage enhancements you can think of. Lol. Thanks Robb
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what year and transmission do you have? and are your 2200 shift points at part throttle or nearly full throttle?
as a rule if you punch it to the floor its going to shift at close to 2500-2600. at part throttle it should be lower, your transmission type determines whether you have truly modulated shifts or not with a 444E.
an allison 643 or 545 with the 444E used an on / off modulator so it only knew if you passed a certain engine load threshold and the ECM would turn on the modulator, raising the shift point high. when the engine load was lower it turned it off which should lower the shift point.. these modulators are a known failure point..
if you have an allison 2000 then it uses a datalink between engine and transmission and has precise throttle and engine load being sent to the transmission resulting in much better shift quality
unless you have a custom setup and Trans computer I cant adjust the shift points, those are hard coded into the TCM on the 2000 series and the modulator is hard code into the ECM on the 545 / 643. sometimes a service shop would install a foot pedal switch for the modulator on the 545 / 643. so it could be controlled when it went into high or low mode.
things I can change with the computer software.. electric fan on,off. speed limiters, auto idle modes, cruise control, read codes, test various engine circuits, change tiure size and speedo settings, EBPV modes, update the software in the ECM,
but I cant change Horsepower ratings or fueling rates, etc..
the 444E likes to drive in that 1800-2000 RPM range for best economy.. running it flat out lowers the MPG and it gets hot in the summer doing that.
-Christopher