I used the Toyota FT-86 on sport soft tires and an oil change. 233hp, 1000kg weight.
Sport softs made it too easy. If I did it again I'd have used sport hards. I had to pit twice (every 20 laps) for new tires (might have had enough fuel to go the distance). My best lap was a 2:08.xxx but I averaged around 2:12 - 2:13s. At the end of the race the 2nd place '01 NSX was a lap down to me.
FYI all the computer cars pitted twice.