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A bit late to the the party but what Paul says is right on! I have done similar testing with 245r6 and 225/40/17 r6 ( except mine is a base 987) and with your wheel size I would also recommend the 225/40. I get at average of 2.5-3 2 day events with the r6s running at a heavy 3050lbs with driver+hard driving. I usually run street tires for first session as warm up.
Another option is the hankook z214 (best price, good life and excellent grip-underrated tire) and bfg r1. Been seeing good results with the bfg in PTD and their 245 dia is a bit smaller than the 245r6. Tire Life is longer too. I have not run either as no contingency offered. For track and fastest performance I would probably run the bfg r1 or r1s, For most cost effective with close performance I would run the hankooks..
Lastly, with an S, Running a 275/35/17 on 9 square would drop considerable time.
Last edited by SBD; 09-19-2013 at 11:01 AM.
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