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Originally Posted by dangonay
So are you trying to imply the tires are the only reason why it's faster? Never mind the changes to the suspension, the new wheels that are 5lbs lighter, the new aerodynamics and rear spoiler, different transmission gear ratios and modified traction control system.
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I think he's trying to say that the Corvette cheated by using half-decent tires
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No, I am not implying the tires is the ONLY reason the ZR1 is faster by 6 seconds nor did I state chevrolet ZR1 is cheating by using michelin sport cup tires.
I do think it is fair game and creative on chevrolet part to put the sport cup "r-compound" tires as an option for Z06/ZR1. I also think the cup tires are the major factor for the ZR1 to reduce the 6 seconds off nurburgring time. 1 - 1.5 seconds from a standard track ( 1:10 to 1:40 second per lap) is equivalent to about 4 -6 seconds at nurburgring.
Hence the reason I was curious how much time the GTR will run with the same spec tires. Can it reduce ~ 4.5 seconds from the 7:24.2. Some of the other items you listed may not make the ZR1 quicker example the changes in taller gears in the transmission only applies to 5th and 6th gear for fuel economy on highways.
My guess if the GTR is using the same spec tires would be very similar to the ZR1 but with about 100 hp less and 400 lb more.