how do you recalibrate the speedometer?
7/15/07, 11:14 PM
#1
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how do you recalibrate the speedometer?
I have the sct programmer, can I do it with that? Or do I need to go back to Doug at Bamma and have him edit my three programs?
(I'm putting 295 45 18's on the back and they are 1.5" taller)
Bill
(I'm putting 295 45 18's on the back and they are 1.5" taller)
Bill
7/16/07, 11:13 AM
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7/16/07, 02:34 PM
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You need the revolutions per mile for your size tire. Check the manufacturer's web site and see if they have the info. For my Nitto 555's, they had the revs/mile listed for each tire size.
7/18/07, 11:42 PM
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Just figure the circumference of the tire. C = pi*diameter
Figure diameter by converting tire size into milimeters, then adding the sidewall size which is a certain percentage of the tire width (i.e. 35, 40, 45). Add those and you have tire diameter in MM.
So now you can figure circumference (c=pi*tire diameter in MM).
So now you know the distance the tire covers in one revolution. Convert to feet for easier measurement, then divide by 5280.
Simple, right?
Figure diameter by converting tire size into milimeters, then adding the sidewall size which is a certain percentage of the tire width (i.e. 35, 40, 45). Add those and you have tire diameter in MM.
So now you can figure circumference (c=pi*tire diameter in MM).
So now you know the distance the tire covers in one revolution. Convert to feet for easier measurement, then divide by 5280.
Simple, right?
7/19/07, 12:51 PM
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