From GTPlanet Game Guides

Bentley Speed 8

with this setup;
Tyres: R2/R1
Brakes: 5/4
Springs: 12.0/12.0
Rideheight: 80/80
Damper Bounce: 3/3
Damper Rebound: 6/6
Camber: 2.5/1.5
Toe 0/0
Stabilisers: 4/4
Gears: Autoset 25 and final to 3.200
Driver aids: ASM 0/0 TCS 7
Downforce: 50/70
LSD: 25/30/20

9 laps/stint makes this the most enduring LMP/GTP of all, and it also gave a 3´26.886 as a fastest lap.

+ Well balanced, pretty fast, good economy.
- A bit slow with Bob behind the wheel.