I use Sail IC's tune on every track. Oval or road course. This isn't a Daytona special tune and I can do 40 second laps of Daytona, which equates to about 350 KMPH in the turns. Bear in mind I use a standard PS3 hand controller.
Fully upgraded the ZR-1 RM gives 905hp at 1100Kg weight. Sail IC's tune
Downforce: 35/53
Transm.: 360 km/h (380 at Nordschliefe) (390 at Daytona - Dands)
Initial torque: 10
Acc sens: 20
Brake sens: 10
Ride h: 5/5 (35/35 at Nordschleife)
Spring: 16.6/14.4
Damp ext 9/7
Damp comp: 9/7
Anti RB: 3/5
Camber: 2/1.5
Toe: 0/-0.30
Brakes: 5/7
Racing soft tyres.