[olgybexs] Lap times of unrestricted race cars

For a given race track, what are the fastest lap times ever done on it, with little or no restrictions on the type of equipment?  Cars run alone to decrease the danger of collisions.  Of course this takes the fun out of it being a spectator sport with lots of complicated strategy.

Inspired by restrictions on race cars.  What if those restrictions were removed?

We probably care about records for 2 or more laps also.