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As for spinning the tires, have you looked into rebuilding your diff for more lockup? On dry pavement I can only chirp the rear tires on the 1-2 shift with the Torsen diff.
So I had a good chance to put the car through its paces this evening. My gawd.
Its a veritable go kart. Understeer is completely gone, and car handles very neutral. Oversteer is actually quite difficult to induce (you have to make a genuine effort) when it does let go it is very easy to hold and control.
The difference between 225F/245R and 245F/255R on my car is night and day. Simply put its amazing.
Braking performance is also greatly improved. I find I can brake much harder while turning sharp then I ever could before. With the 225's up front braking hard with excessive turnin the front end would plow into gross understeer. Now it just GOES.
I have not smiled like I did tonight in a long.. long time.
Also worth noting I have noticed NO loss of turning radius/lock to lock with the 8.5's up front vs the 7.5's. It seems well matched and still quite usable in parking situations.
Yes well as a general rule the wider the tire the worse it will perform in standing water and snow.
This car won't ever see snow, and I never found the 225/245's to be an issue in the rain before. Just driving responsibly and not getting on throttle through large amounts of water and I have no issues.
Tenured Automotive Service Professional - Avid BMW Enthusiast
Also worth noting I have noticed NO loss of turning radius/lock to lock with the 8.5's up front vs the 7.5's. It seems well matched and still quite usable in parking situations.
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