Quote:
Originally Posted by DallasBoosted
No, it doesn't take wheel diameter or tire size into account; but since it uses the wheel speed sensors any changes in gearing (rear end or transmission) won't matter to it. All it can do is measure each time the wheel turns; how far the car moves for each revolution is a mystery to it. Bigger overall circumference of tires will cause the speedo to read slower (and thus the AP slower), shorter tires will cause it to read fast.
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Yeah, you're right about the tire diameter. Total brain fart on my end. However, in all instances that I've see the AP reads fast. That's not saying it always reads fast, you could possibly find 100 instances where it reads slow, but that's just what I've seen.