The R8 isnt one of the fastest cars in the 24hr race, Unless your extremely good you will need a better car than that to win it. Your up against groupC and LMP class cars in this event why only PD can answer. Look at the 2J,787B or even the 908. AI lap around 8.10 if i remember correctly in the day and same times in the night only slowing if wet, they use the 787B and the 2J amongst others. practice in your car of choice daytime and nightime to see what lap time your achieving, If your looking for a close race ain for slightly slower laps than ive stated around 8.20 should keep you on your toes.