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| Minotaur Automotive Tuning Software Tune your own 7.3L Diesel! If you have a question or comment about Minotaur? Post it here. Also, check out our Facebook group: Facebook - Minotaur Tuners |
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#1
Mon, August 4th, 2025, 02:54 PM
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Calibrate Speedometer
Trying to calibrate my speedo for the new tires and im not sure its doing anything. I adjusted the revs per mile to what the new tires are and my GPS is still showing 4-5 mph higher than speedometer. Original tires revs per mile was 649 i think and my new tires are 579...
Any advice would be much appreciated. 
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#2
Wed, January 7th, 2026, 09:50 AM
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I know this is a very old post, but the Anti-lock Brake Module controls the speedometer. The Vehicle Speed Sensor's first stop is the ABS module where the AC sine wave from the variable reluctance output is converted to a digital signal read by numerous modules in the vehicle.
Certain scan tools have the ability to reset the revs/mile in the ABS module as the PCM has nothing to do with it.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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Linear Mode
