I only just found some time to test on this track. Marcus, I didn't get to see your post first so lets see how we compare!
Nice version but no one told the developer that the area for miles around is totally flat!
I picked a variety of cars hoping to find one that would have enough of a top speed, a decent lap time and a want to slide out to the wall at the outside.
Default cars with wing set to one, no other changes except for gearing on a couple of cars. Exit the pit, staying on pit road all the way to the back straight, to one timed lap. For each car I also did a lap following the white line at the inside of the track, a grip test. Any car faster on the inside line would have too much grip.
In the order I tested:
F3000 race line 51.525 inside line -.223 287kph
Cat 320 race line 57.873 inside line
could not hold 235kph
FBMW race line 1:01.964 inside line -.107 235kph
RR1 race line 43.525 inside line -.076 335kph
SR4 race line 54.895 inside line +.094 265kph
Race 07 BMW E90 race line 57.456 inside line +.374 265kph
The SR4 just didn't seem a challenge, too easy a drive.
None of the formula cars would make a good racer here, the RR1 having the best chance since it at least good eye hand co-ordination is needed with it
IMHO the Cat320 would make for the best drive and the best race. It pushes out of the corners which means entry speed has to be controlled and will trash itself on the outside wall if a bad pass is attempted.
I liked the lap in the beemer too but at least the Cat has the look of a way old indy car!