BMW M4 GT3

TYRES

• Slick (Dry), Front 27.5 PSI, Rear 27.0 PSI cold — race trim slightly above min to manage long-run deg with aggressive driving and COTA's high-energy Turns 1, 11, and 19-20.
• Optimal tyre operating window: 85–95°C for peak grip; avoid exceeding 105°C to prevent thermal degradation over stint length.

ELECTRONICS

• TC1: 4
• TC2: 3
• ABS: 4
• Engine Braking / Brake Magic: Medium (-2 from max, to stabilize rear under late braking)
• Brake Bias: 54.0% front (base), adjustable -1.0% as fuel burns off

SUSPENSION

• // FRONT
• Ride Height: 58 mm
• Wheel Rate FL / FR: 175000 N/m / 175000 N/m
• ARB: 145 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 54.0%
• // REAR
• Ride Height: 62 mm
• Wheel Rate RL / RR: 165000 N/m / 165000 N/m
• ARB: 110 N/m
• Diff Preload: 60 Nm
• Diff Coast: 0.5
• Diff Power: 0.6

DAMPERS

AERO

• Front Splitter: 4 clicks (medium-aggressive)
• Rear Wing: 6 clicks (high downforce bias for COTA's mix of fast sweepers and heavy braking zones)
• Downforce Level: Balanced-High, slight rear bias for stability under power out of Turn 11/12 and through Esses
• Brake Ducts: Front 5 / Rear 4 (manage temps given heavy braking zones T1, T12, T20)

KEY SETUP NOTE

• COTA punishes both front-left tyre life (high-speed Esses, Turns 2-9) and rear traction (Turn 11, 19-20 exits) — run slightly stiffer front ARB with rear-biased diff power lock to protect rear tyres on exit while keeping front rotation sharp for late-braking into Turn 1 and Turn 12.

TRACK GUIDE

• Turn 1: Committed late-braking zone from 320+ km/h — trail brake deep but respect front-left tyre load; early release rewards mid-corner rotation.
• Esses (Turns 2-9): Minimal steering correction, let the car flow — stiffer front ARB holds line without scrubbing tyre life.
• Turn 11 (hairpin): Classic overtaking spot — brake late, rotate hard, but be progressive on throttle to protect rear tyres for the final sector.
• Turn 12-15 (back section): Traction out of 12 sets up the run to the Esses-like complex — prioritize exit speed over entry aggression here.
• Turn 19-20 (final corners): Last chance to gain time onto the front straight — aggressive but controlled throttle application critical for lap time and tyre preservation into next lap.