Quote:
Originally Posted by semtex
I'm wondering if the worn tires have something to do with the diminished dyno numbers. Because tire wear means the overall circumference of the tire gets smaller over time. And if I'm thinking this through correctly, a smaller circumference tire would spin the dyno drum less, thereby resulting in a lower number. Someone tell me if that's logical or if I'm completely off base, lol.
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Your tire diameter changed by as much as 3%, but the dyno is measuring how much load you are putting on the drum, not how fast you are spinning it overall. Effectively it is a gearing change, so you've gone from a 3.69 to a 3.83 final drive (worst case). Some dyno's are more finicky about this than others so there is a possibility of a small margin of error.