Porsche 911 Carrera RSR 3.0

• Important context note: the Porsche 911 Carrera RSR 3.0 is a 1974 classic air-cooled, narrow-bodied, low-downforce touring/GT car with a mechanical (non-adjustable-in-cockpit) setup, cross-ply-era geometry, no TC/ABS, and no ERS. It shares nothing with the 992 GT3 R apart from the rear-engine layout — the GT3 R parameter ranges do NOT apply here. Values below are scaled correctly for this classic car's much narrower adjustment ranges in AC.

TYRES

• Compound: Slick (period Semislick in some AC versions — use Slick if offered)
• Front: 24.5 PSI cold → target ~28 PSI hot
• Rear: 26.0 PSI cold → target ~29–30 PSI hot
• Optimal operating window: 75–85°C for this era slick/semislick compound — narrower and lower than modern slicks; overheating the rears under power is the main limiter.
• Blankets: not applicable to this car in AC — expect a genuine warm-up lap before tyres reach window.

ELECTRONICS

• TC: none fitted
• ABS: none fitted
• Engine braking: fixed (mechanical, non-adjustable)
• Brake bias: adjustable via front brake bias slider only — see below

SUSPENSION

• // FRONT
• Ride Height: 110 mm
• Wheel Rate FL / FR: 48,000 N/m / 48,000 N/m
• ARB: 12,000 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 54%
• // REAR
• Ride Height: 115 mm
• Wheel Rate RL / RR: 58,000 N/m / 58,000 N/m
• ARB: 8,000 N/m
• Diff Preload: 60 Nm
• Diff Coast: 0.5
• Diff Power: 0.3

DAMPERS

AERO

• Front: fixed lip/no adjustable splitter (0 clicks — stock ducktail-era aero)
• Rear: ducktail spoiler fixed, no adjustable wing on this model
• Downforce: minimal by design — Monza favours this car's low drag, straight-line strength
• Brake ducts: fully open (max cooling, no tyre-temp downside relevant to single lap)

KEY SETUP NOTE

• This car has almost no aero grip and a pendulum rear-engine weight bias — at Monza the lap is won by carrying minimum front-end scrub through Lesmo and Ascari rather than fighting for outright mechanical grip; keep the front end planted with slightly higher front ARB stiffness relative to a stock road setup, and use the diff's low power lock to let the rear squat and hook up early out of Parabolica without snapping into oversteer.

TRACK GUIDE

• T1/2 Rettifilo: brake very late but progressively — this car has no ABS, so trail brake smoothly, not stab-and-release, to avoid rear lockup and a spin on the chicane kerb.
• Curva Grande: taken near-flat but respect the RSR's narrow rear track — small steering inputs only, mid-corner throttle lift will unsettle the rear at this speed.
• Ro