BMW Z4 GT3

TYRES

• Slick (Soft compound), Front 22.5 PSI cold / Rear 22.0 PSI cold — settling to ~27°C optimum window (hot target ~26–28 PSI). Optimal tyre operating temperature: 85–95°C, peak grip centered ~90°C. No blankets assumed — expect first-lap warm-up if session starts cold.

ELECTRONICS

• TC: 2 (minimal, quali attack, rear still needs some safety net over Eau Rouge kerbs)
• ABS: 1 (low intervention, maximize late braking feel)
• Engine Braking: 4 (mid setting, stability into Les Combes/La Source without killing rotation)
• Brake Bias: 55.5% front

SUSPENSION

• // FRONT
• Ride Height: 55 mm
• Wheel Rate FL / FR: 145000 / 145000 N/m
• ARB: 70000 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 55.5%
• // REAR
• Ride Height: 60 mm
• Wheel Rate RL / RR: 130000 / 130000 N/m
• ARB: 45000 N/m
• Diff Preload: 80 Nm
• Diff Coast: 0.45
• Diff Power: 0.60

DAMPERS

AERO

• Front Splitter: 4 (of typical 0–5 range)
• Rear Wing: 6 (of typical 0–10 range — aggressive but Kemmel/Blanchimont still need stability, not max drag)
• Brake Ducts: not adjustable on this car (fixed)

KEY SETUP NOTE

• The Z4 GT3's front-engine weight bias makes rear stability through Eau Rouge/Raidillon and Blanchimont the true lap-time limiter — this setup runs slightly stiffer front ARB and reduced rear ARB versus default to force rotation at La Source and Les Combes without sacrificing the flat-out compression sections; do not chase more front camber for one-lap pace at the cost of a nervous rear on the Raidillon crest.

TRACK GUIDE

• La Source: brake as late as possible in a straight line, trail-brake to rotate — this car's strong front turn-in under trail braking is your biggest overtaking/time weapon here.
• Eau Rouge/Raidillon: commit flat if exit speed from La Source is good; keep the car dead straight over the crest — any steering input here with a loose rear will snap on the compression.
• Kemmel Straight: stay full throttle, tuck in — this is where rear wing setting (6) costs you top speed vs the downforce gained elsewhere; accept it for stability.
• Les Combes: heavy braking zone, brake in a straight line before turn-in, use the stiffer front end to rotate hard into the chicane — trail brake to the apex.
• Pouhon: commit early with confidence in the front aero platform — a lifted or hesitant entry here costs more time than anywhere else on track.
• Bus Stop: sacrifice a fraction of entry speed for a clean, stable exit onto the pit straight — this is where the lap is banked, not lost.

THEORETICAL BEST LAP

• 2:16.500 — the