Audi 90 GTO

A period IMSA GTO turbo car: front-engined, all-wheel drive and powerful, and less forgiving than a modern GT. Period aero and tyres make braking zones and exit patience the whole game.

Slow it while you can still see the apex, rotate once, then feed boost carefully. Period cars punish overlap more than modern GT machinery.

Symptoms this car reads differently

Pushes on entry

Mass and a front engine. Excess entry speed shows immediately.

Snaps on exit

Turbo lag then a surge. Build throttle with the wheel opening.

Falls off over the stint

Period rubber and boost heat. Tidy early laps preserve the stint.

What this car's answers lean on

Compared with other Production cars

1. Free changes — driving, not setup used more than on most cars like it
2. Tyre pressures used more than on most cars like it
3. Braking system — bias, ABS, pressure used more than on most cars like it
4. Anti-roll bars
5. In-car driver aids and gearing
6. Camber, toe, caster
7. Damper clicks
8. Differential and engine braking
9. Spring rates

What you cannot change on this car

• The differential is fixed on this car.
• Engine braking is not adjustable on this car.
• This car has no adjustable aerodynamics.
• Total brake pressure is not adjustable on this car.
• Gearing is fixed on this car.
• No third spring on this car.
• No adjustable bump stops on this car.
• This car has no dampers with that adjustment.