Quote:
Originally Posted by wnta1ss
With those IMO overly-tall 305/35s, you should easily be able to move the shifter over to manual in 5th gear if the locked trans is short-shifting into 6th currently. Based on what my car did in the A8 4th gear with the MT 305/45-17 at 6500 rpm, I could see the A10 5th gear making 129mph at 6500 rpm with that 28.1" tire. Your tire is even taller than that. Honestly, I think that even the 275/35-20 could have likely made the stripe if you held 5th gear manually, maybe ~123mph@6500, or a scosh more?
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with a 28.4 tire 1.52 5th gear ratio (10 speed ), 2.77 rear 6000 rpm = 120.45 mph. With a 28.0 tire 6300 rpm = 124 mph. The factory 245 40 20 is 27.7 inches tall and I believe the SS rear tire 275 35 20 is 27.8 inches tall.