Mine does 42.5 laps. That's worth like 30 secs less per race. You must be doing something wrong.
I can make it go that fast but sometimes when they hit cars with not enough right turn set then will bounce left and spin into the wall, then you come back and your car is doing a burnout up against the wall lol.
45.4's I have run 100 races there and not a single crash into wall situation lol.