Porsche 911 GT3 Cup (992)

TYRES

• Compound: Slick (S)
• Optimal operating temperature: 85–95 °C (peak grip window)
• Front PSI: 26.5 cold (FL 26.5 / FR 27.0)
• Rear PSI: 26.5 cold (RL 26.5 / RR 27.0)
• Camber: FL -3.6° / FR -3.6° / RL -2.8° / RR -2.8°
• Toe: Front 0.00° (neutral for max turn-in bite) / Rear +0.20° toe-in
• Note: No tyre blankets in AC Evo. Cold pressures sit close to the recorded lap's baseline, which built to about 27.5 PSI hot. Spa is a long, high-load lap with Eau Rouge, Pouhon and Blanchimont loading the tyres, so staying near that baseline keeps hot pressures in the 27–28 PSI window.

ELECTRONICS

• TC: 2 (down from 3; aggressive exit style, with the rear-engine traction used to rotate. Go to 3 if the rear steps out on cold, green track exits)
• ABS: 3 (down from 4; allows later, deeper trail braking at La Source, Les Combes and the Bus Stop)
• Engine Braking / Brake Magic: not adjustable on this car
• Brake Bias: 58.0% front (slightly rearward of the recorded 58.6% to help rotation under hard trail braking)

SUSPENSION

• // FRONT
• Ride Height: 52 mm
• Wheel Rate FL / FR: 190,000 N/m / 190,000 N/m
• ARB: 28,000 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 58.0%
• // REAR
• Ride Height: 72 mm
• Wheel Rate RL / RR: 170,000 N/m / 170,000 N/m
• ARB: 22,000 N/m
• Diff Preload: 60 Nm
• Diff Coast: 0.4
• Diff Power: 0.5

DAMPERS

AERO

• Front wing/splitter: not adjustable on the Cup
• Rear Wing: 5 of 8 clicks (medium-low downforce; the Kemmel Straight and Blanchimont reward lower drag, but the rear must stay planted through Eau Rouge/Raidillon and Pouhon)
• Downforce Level: medium-low
• Brake Ducts: Front 2 / Rear 1 (single flying lap, so brake temperature is not a concern. Open minimally for drag)

KEY SETUP NOTE

• Spa punishes a rear that is too loose in the fast, compressed sections (Raidillon, Pouhon, Blanchimont), but the 911's rear-engine layout needs rotation help at the slow La Source and Bus Stop. Keep the rear ARB soft and the rear ride height at 72 mm for compliance and traction, and use diff preload (60 Nm) plus a lower TC to rotate, rather than stiffening the rear. Do not raise rear ARB or lower rear ride height past these values, or the pendulum effect will snap the car on exit.

TRACK GUIDE

• La Source (T1): Brake late and hard from the start/finish straight, trail the brake deep to rotate the nose, then get the power down early on the exit. Carry as much speed as possible, since it feeds the run down to Eau Rouge.
• Eau Rouge / Raidillon (T2–T4): Flat-out with a straight, committed line. Stay smooth on the inputs. The compression at the bottom loads the rear, so avoid any lift or steering correction that unsettles the 911's rear.
• Les Combes (T5–T6): Heavy braking after the Kemmel Straight. Brake late in a straight line, then trail into the right-left. Use the kerbs, but avoid over-rotating, as the rear gets light on entry.
• Pouhon (T10–T11) and Blanchimont (T17): Lift-free or minimal-lift commitment on smooth lines. Both reward a stable platform, so use the softer rear to keep traction and place the car precisely.
• Bus Stop chicane (T18–T19): The last big braking zone. Brake deep, ride the kerbs aggressively, and focus on traction out onto the main straight to protect the lap's final tenths.