Here is the setup I used to win this terribly frustrating B-spec race hope it helps
Car: Toyota 7 Race Car '70
Aerodynamics: Front 60 Rear 85
Turbo Kits: High RPM Range Turbo Kit
Transmission: 260kmh Top speed
Suspension:
1.Height: -30mm Front and Rear
2.Dampers (Extension): 10 Front and Rear
3.Dampers (Compression): 9 Front and Rear
Wheel Alignment: Camper Angle: 1.5 Front and Rear
That's the setup I used to win and anything not mentioned was left default or unchanged. This setup worked first try for me all though there's no guarantees it will work for you sorry.