Quote:
Originally Posted by Breezio
I agree. My anecdote was more about how much of a difference that final drive makes and the 255's possibly being needed and not a detriment on the 17-20 cars. I should have made it more clear.
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I ran 245's in 2020 and switched to 255's in 2021 on my '13. I don't have the data in the same places that I can readily compare but what I did see is that I saw about 3-4 mph slower in the back stretch at Mid-Ohio with the 255's even though I added a tune and other mods that definitely give the car more power.
I have some drag racing background and I know that a 4.30 vs. a 4.10 rear gear combined with the impact of a tire that is 1/2" bigger in diameter would be consistent with what I've experienced.