TCH is governor limited to 118 miles per hour, but the car feels pretty solid at high speeds , I'm sure it could do better if it was reprogrammed. If it had stiffer springs it would be better on winding roads as well. Lucky you to have access to such a nice racetrack, but not letting the car go to top speed, shame on you, i don't think I could resist. Keep in mind your speedometer is off by about 4 miles so you should have 122 miles per hour indicated , better yet if you could get hiking GPS, that should be accurate within a mile. And while at the racetrack you could also try to see how stability control works at high speeds, I did some "playing around" in the last year snow, but not knowing the limits I had to be careful, never the less TCH felt composed even on ice all the way to the point of total loss of traction. Have fun.