Join Date: Jun 2006
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sct didnt seem to change my speedo for tire size
hey guys, i upgraded from the stock tires to 35 inch tires. best i could tell the stockers were about 30 inches call, and my new tires are about 33.75 inches tall. its throwing my speedometer off im sure.. when i got my sct i was under the impression it would alter my speedo as well. but when i change the size on the sct it doesnt seem to make any affect on my speedo. if i got stock tuning or the sct tuning i still sit exactly at 2000 rpms at 70 mph. for a 33.76 diameter tire,, what revs per mile should i have it set at?
i may be wrong,, but this is how i figured i was suppose to do it.
33.75 times pi is 105.975. im gonna round to 106.
so 106 is my circumfrence in inches.
a mile is 5280 feet. that times 12 (inches in a foot) is 63360 inches in a mile.
63360 divided by 106 is about 597 or 8 revs per mile.
Does that sound right?????
If the sct doesnt actually affect my speedo,,, and my only option is to take it to the dealer,,,,, do i need to tell them a specific number??