Hi There: Your old front setup of 225/45-17 fronts would revolve 808 times per mile while your new 235/45-17 tires only revolve 796 times per mile. This is because the new tires have 1.1 inches greater circumference.

Your old rear tires were even smaller, at 2 in. less circumference than the 235/45-17 size. This would produce 816 rev/mile. No problems with your ASR/ABS using the old setup?

Regarding your question on acceleration, I think your camber probably affects this more than the change of tire sizes. Increased negative camber does have a negative effect on straight line braking and acceleration, however you've probably found out that it sure helps around the corners! :p

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Dean Albrecht
"Lead, follow, or better yet, get out of the way!"E500 owners motto