Porsche Cayman GT4

TYRES

• Semislick compound, front 29.0 PSI cold (target ~32 PSI hot), rear 28.5 PSI cold (target ~31.5 PSI hot). No tyre blankets in AC — expect a cold out-lap; build temp through Abbey/Village before pushing.

ELECTRONICS

• TC: 2 (minimum usable for traction out of Vale/Club/Luffield on a slick-adjacent compound)
• ABS: 4
• Engine Braking: N/A (fixed on GT4 road-based drivetrain, not adjustable)
• Brake Bias: 68% front (set in Brakes section below, repeated here per car's cockpit-adjustable bias)

SUSPENSION

• // FRONT
• Ride Height: 65 mm
• Wheel Rate FL / FR: 68000 N/m / 68000 N/m
• ARB: 14000 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 68%
• // REAR
• Ride Height: 68 mm
• Wheel Rate RL / RR: 72000 N/m / 72000 N/m
• ARB: 12000 N/m
• Diff Preload: 40 Nm
• Diff Coast: 0.4
• Diff Power: 0.6

DAMPERS

AERO

• Front splitter: fixed (no adjustable front wing on GT4 Cayman)
• Rear wing: 4 (of available range, car-dependent max usually 6) — biased toward stability through Maggotts-Becketts over outright Hangar Straight speed
• Brake ducts: 2 front / 2 rear (minimal, cold-tyre single-lap compromise)

KEY SETUP NOTE

• The GT4 Cayman has soft, narrow-range suspension and a locked/limited diff compared to GT3 — stability through Maggotts-Becketts is won with ride height and ARB balance, not aero, so keep rear ARB soft relative to front to let the rear rotate slightly into Becketts without snapping on exit.

TRACK GUIDE

• Abbey/Village/Loop: brake in a straight line, trail into Village — this low-grip, mid-engine car rotates easily on trail-brake, don't overslow it or you lose the Loop exit onto the Wellington straight run.
• Maggotts-Becketts: commit flat-ish in top gear if the setup holds — any front-end push here costs 3-4 tenths; use the inside kerb lightly at Becketts, the chassis handles sausage kerbs better than most GT cars but don't fully unload the outside tyre.
• Stowe braking zone: heaviest stop on track — brake later than instinct says, the GT4's light weight and strong front bias (68%) let you out-brake GT3s here, but trail off smoothly to rotate for Vale.
• Club/Luffield traction: both are slow corners feeding a straight — get on power early and straight-line the exit, TC at 2 keeps wheelspin in check without killing drive.
• Lap time is won in Maggotts-Becketts commitment and in minimizing time lost on the Village/Loop chicane — the Cayman's low grip ceiling means smoothness through the infield matters more than outright braking bravery.

THEOR