doctoring engine speed - Ranger-Forums - The Ultimate Ford Ranger Resource


Drivetrain Tech General discussion of drivetrain for the Ford Ranger.

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Old 01-23-2016
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doctoring engine speed

hey...anyone know whether there is a simple way to change engine rpm after the final o/d shift point? am quite sure it would save a lot of fuel on a long trip if the motor was turning say 1200rpm vs the current 2000+...i have the 3.0 v6 with the auto. o/d trans-1995 model...

Last edited by rngr4142; 01-23-2016 at 04:51 PM. Reason: needed xtra info
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Old 01-23-2016
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No nothing simple.

Computer controls shift points, based on RPM, speed and Throttle position(TPS).

You could change speed going to computer, not speedo, with something like this:
Universal Speedometer Signal Interface

And you can usually get computers reprogrammed but not sure on the 1995 it was a transition year, but not simple or cheap
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Old 01-24-2016
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doctoring engine speed

thanks- figured there had to be a way-and cant seem to get how the automotive engineers dont set the system up with such a program to begin with...?.....for ALL vehicles.
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Old 01-24-2016
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While that would be a boon to Ford Dealers, collecting $$ when customers F*ed up shift points, it wouldn't be very practical long term Ford.

Some car makers do have automatic trans "controls" but just selections of preprogrammed routines.
Regular for best economy
Performance for.......best performance MPG be damned, lol.

Even had one with "Snow" selection, trans would start in 2nd, and keep RPMs low for less chance of torque wheel spins in slippery conditions.

While you may not agree, lol, most Ranger buyers didn't get them for street performance, just hauling stuff when needed, the whole point of a pickup truck vs a car


You can add separate control system although it isn't cheap, there are a few makers of these, this is one: https://www.powertraincontrolsolutio...on_Controller/

You can also add manual shifting as an option to a control system like these for even more control.
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Old 01-24-2016
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doctoring engine speed

does the device allow you to adjust shift points or does it allow you to dial the actual rpm of the engine? i was hoping for something that i could set once and begin driving again with engine rpm above say 50mph @ whatever i set it for.....?

Last edited by rngr4142; 01-24-2016 at 03:57 PM.
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Old 01-24-2016
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You would have to research what your transmission model is capable of. i.e. what solenoids do what when activated.
And then look at 3rd party controllers to see what they offer for that transmission.

I know on some of the Ford 5 speed transmissions they leave trans in 1st(2.47) and then activate OverDrive(.75) to get 2nd gear(1.85) ratio, lol, neat(and cheap for Ford) trick to make a 4 speed a 5 speed.

2.47 x .75 = 1.85 2nd gear
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