Jamie, I'll give you respect from a future ACR owner perspective, but there is no reason to think the ZR-1 can match the ZCR. And it's not as simple as a change of tires because you cant put equal tires on the ZR-1 without switching wheels, which is too much.
IMO GM has left their fans too much explaining to do by putting tires on their cars that arent up to par with the competition, so all that follows is excuses. Look at all the other 100k + sports cars, many coming with MPSC now, and GM is just getting to PS2's which is pathetic.
But prior to now the Vette could still beat everyone with that, but the game has changed. The ZR-1 will beat most all, but not cars that are just as fast and have better tires. We could talk what if's all day, but the fact is that as they come from the showroom, the ZR-1 will get beat with equal drivers.
I personally think a wheel and tire change will make it a nail biter, but still when you pay 100k for a corvette, you shouldnt have to say "well if I do this, then....."