Porsche 911 RSR 1974

TYRES

• Slick compound, front 1.63 bar / rear 1.72 bar cold set (accounting for heat build-up to match hot target ~1.66/1.73 bar). Tyre blanket temp: 80°C if blankets available, else prioritize warm-up lap weaving to reach optimal window.
• Optimal operating temperature for max grip: 85–95°C (slick compound, 1974 historic tyre model — narrower working range than modern slicks, avoid exceeding 100°C).

ELECTRONICS

• TC: N/A (no electronic aids — mechanical era car)
• ABS: N/A (non-ABS, cadence braking required)
• Engine Braking: Medium setting (if adjustable on this model) — stabilizes rear under trail-braking
• Brake Bias: F: 44.0% / R: 56.0%
• Brake Pressure: 96%

DRIVETRAIN

• Fuel Map: Map 1 — full rich, max power, no fuel saving needed for single lap
• Gear Ratios:
• 1st: 2.58
• 2nd: 1.93
• 3rd: 1.54
• 4th: 1.27
• 5th: 1.04
• Final Drive: 4.11

SUSPENSION

• // FRONT
• Ride Height: 95 mm
• Wheel Rate FL / FR: 32000 N/m / 32000 N/m
• ARB: 24 N/mm
• Brake Torque Multiplier: 100%
• Brake Bias: 44.0%
• // REAR
• Ride Height: 105 mm
• Wheel Rate RL / RR: 38000 N/m / 38000 N/m
• ARB: 18 N/mm
• Diff Preload: 60 Nm
• Diff Coast: 0.6
• Diff Power: 0.5

DAMPERS

AERO

• Front: minimal lip spoiler, fixed angle (no adjustable front wing on this model)
• Rear: ducktail spoiler, mid-range angle setting (3 of 5 clicks)
• Downforce Level: Low-medium — this car relies more on mechanical grip; Curitiba's long straights favor lower drag
• Brake Ducts: Front 2/6, Rear 3/6 (moderate cooling, short single-lap run doesn't need max cooling)

KEY SETUP NOTE

• The RSR 1974's narrow slicks and high polar moment demand a rear-biased mechanical setup (stiffer rear ARB, softer front) to tame snap oversteer on throttle application — critical through Curitiba's fast Ferradura and the tightening final corner onto the pit straight, where early, progressive throttle is the only way to carry speed onto the long straight.

TRACK GUIDE

• Turn 1 (Senna S, heavy braking): brake very late, trail into the apex using weight transfer to rotate the car — this car's narrow front tyres need a firm early bite before you can commit to throttle.
• Ferradura (fast sweeping right-hander): commit to a wide entry line, minimal mid-corner correction — a lift here costs multiple tenths due to the low-drag aero setup.
• Final corner complex before main straight: this is where the lap is won or lost — get the car rotated early, sacrifice a fraction of mid-corner speed for a clean, full-throttle exit onto the longest straight on the circuit.
• Traction zones: this engine's torque delivery means early, smooth throttle application is more valuable than outright steering precision — modulate with the right foot, not the wheel.
• Braking zones generally benefit from a slightly front-biased brake setup given the lack of ABS — threshold/cadence braking technique is essential to avoid front lockup under late braking.