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Old 02-04-2021, 08:50 PM   #1
Mini-Skoolie
 
Join Date: Jan 2021
Location: Elgin, TX
Posts: 28
manual rheostat instead of TPS for automatic transmission control?

I've got an idea regarding a computer controlled automatic transmission - a manual potentiometer


I have an Allison 2500 that I want to swap for the AT545 behind a carbed 454. There is no TPS on the carb, and I don't want to add one.
What if, for the TPS input to the computer, I hook up a manual potentiometer and put it on the dash?



So, when I want it to downshift and change the shift points to high RPMs, I slide the potentiometer up to imitate full throttle. Coasting on the highway, slide it down to indicate low throttle. Then I can have more control of the shifting. I can make the computer think I have it floored if I wanna run higher RPMS at low throttle. I can make the computer think I have it at low throttle and not downshift if I want to lug the engine. Or somewhere in the middle.



Would this work?

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Old 02-04-2021, 08:59 PM   #2
Mini-Skoolie
 
Join Date: Jan 2021
Location: Elgin, TX
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Are the TPS on buses on the gas pedal anyway?
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Old 02-04-2021, 10:41 PM   #3
Bus Nut
 
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Join Date: Nov 2014
Location: NM USA KD6WJG
Posts: 863
Year: 1991
Coachwork: Bluebird
Chassis: All American RE 40 FEET
Engine: Cummins 8.3
I don't think that is going to work for a number of reasons, first of all you will have very erratic shift quality and timing. The other is most tps units are 3 wire units that the computer sends a reference voltage and has to see a return. More than likely will set codes. cadillackid will have a solution. By the way was this transmission programmed for the big block chevy?
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