If you want to time laps at the ring, drive it in GT5, not real life.
As others have said, driving the ring can be dangerous at the best of times, but trying to "out do" each other will end in tears
Anyone trying to beat a set time could well end up killing someone else; shooting them first would stop that happening, so who's the bellend?
A trip to the ring should be fun (it's worth it just for the car park), but posting up a "sub 8-min lap time challenge" shows a lack of maturity and respect for the ring in my eyes.
All my own opinion of course