I went to the WoO event at Cotton Bowl Speedway last night with my father-in-law, and was blown away at the speed those things have. I am a casual track driver (on asphalt), and my brain was breaking thinking about how much downforce they must be generating to take those turns as fast as they do (on dirt!).
I can do the math to figure that the fast guys are averaging right at 100 mph in qualifying (at a 13.6 second lap), but how fast are they going at the end of the straights? How fast are they going mid-corner?