Speedometer calibration math
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Mountain Pass
Joined: May 2017
Posts: 152
Likes: 3
From: Colorado
Speedometer calibration math
Hello, been on this site mainly in 57-60 section. Bought a new to me 97 f550 crewcab longbox 7.3
truck has 37x13.5x22 wheels
tires measure 36 inch actually
manufacturer says 571 rotations per mile
how do i do the math to calibrate my speedometer correctly? I can do the calibration but cant seem to find any details on how to determine the value programmed in the speedometer cluster. Only have 5 tries left
any help would be greatly appreciated, especially since my first try is way off
thanks!!!
truck has 37x13.5x22 wheels
tires measure 36 inch actually
manufacturer says 571 rotations per mile
how do i do the math to calibrate my speedometer correctly? I can do the calibration but cant seem to find any details on how to determine the value programmed in the speedometer cluster. Only have 5 tries left
any help would be greatly appreciated, especially since my first try is way off
thanks!!!
Thread Starter
|
Mountain Pass
Joined: May 2017
Posts: 152
Likes: 3
From: Colorado
I figured it out.
Tire Revelations per mile x. 120 (tooth count) / 8000 = number needed
i was using 108 instead of 120
mine is
571 x 120 = 68520
68520 / 8000 = 8.565. Round up to 8.57 or 857 in PSOM
Tire Revelations per mile x. 120 (tooth count) / 8000 = number needed
i was using 108 instead of 120
mine is
571 x 120 = 68520
68520 / 8000 = 8.565. Round up to 8.57 or 857 in PSOM
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