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Mustang Forums
2011-2014 Mustangs
Wheels/Tires/Brakes
Speedo Calibration Theory
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<blockquote data-quote="helloWorld" data-source="post: 15297487" data-attributes="member: 142369"><p>Hello guys. I am just trying to think something through and am wanting some other opinions.</p><p></p><p>I know the analog speedometer in the dash is run off of the rear tires. I also know that Ford uses a positive 1.3403 % offset (Source: <a href="http://www.efidynotuning.com/trans.htm" target="_blank">http://www.efidynotuning.com/trans.htm</a>) for the revs/mile adjustment.</p><p></p><p>Still, if my rear tires are one height and my front tires are a different height, will the speedometer every be able to perfectly accurate? The manufacturer specifies 791 revs/mile for my rear tires. I have tried everything from 775 to 800 revs/mile on my X4, and my speedometer always seems to read 1-3 mph faster that what my gps tracking states, depending on how fast I am moving.</p><p></p><p>I will be taking some sticky goo and a tape measure and manually calculating my revs/mile today, but I am wondering if I am chasing after something that is too much of a fine adjustment for the X4's 5 rev/mile graduations.</p></blockquote><p></p>
[QUOTE="helloWorld, post: 15297487, member: 142369"] Hello guys. I am just trying to think something through and am wanting some other opinions. I know the analog speedometer in the dash is run off of the rear tires. I also know that Ford uses a positive 1.3403 % offset (Source: [URL]http://www.efidynotuning.com/trans.htm[/URL]) for the revs/mile adjustment. Still, if my rear tires are one height and my front tires are a different height, will the speedometer every be able to perfectly accurate? The manufacturer specifies 791 revs/mile for my rear tires. I have tried everything from 775 to 800 revs/mile on my X4, and my speedometer always seems to read 1-3 mph faster that what my gps tracking states, depending on how fast I am moving. I will be taking some sticky goo and a tape measure and manually calculating my revs/mile today, but I am wondering if I am chasing after something that is too much of a fine adjustment for the X4's 5 rev/mile graduations. [/QUOTE]
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