Quote:
Originally Posted by Lunatic
That don't sound right to me. What size tires you running. I'm running 255/40/17 which is 25" dia. 78.6 circumference.
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Tire size won't effect the displayed speed vs rpm. The only time tire size will show a difference in speed is if you're reading by GPS or from outside the car.
Most older cars a changed final drive would affect the speed displayed, but these cars use the wheel speed sensors not a sensor in the gearbox (before the final drive).