BMW M4 GT3

TYRES

• Slick (Dry) — Front: 27.5 PSI, Rear: 27.3 PSI cold. Tyre blanket temp: 80°C. Optimal operating window for max grip: 85–100°C (front and rear) — race stint management should target sustained tread temps in this band; avoid exceeding 110°C on rears through Mulsanne braking zones as this accelerates thermal degradation over the long straights.

ELECTRONICS

• TC1: 5 (race, aggressive but stable off Mulsanne/Indianapolis)
• TC2: 3
• ABS: 4
• Engine Braking / Brake Magic: Medium (setting 3 of 5) — reduces rear instability under hard trail-braking into Mulsanne Corner and Arnage
• Brake Bias: 54.0% front (adjustable +/-2% in-cockpit for fuel load changes)

SUSPENSION

• // FRONT
• Ride Height: 65 mm
• Wheel Rate FL / FR: 190000 N/m / 190000 N/m
• ARB: 120 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 54.0%
• // REAR
• Ride Height: 70 mm
• Wheel Rate RL / RR: 175000 N/m / 175000 N/m
• ARB: 95 N/m
• Diff Preload: 40 Nm
• Diff Coast: 0.35
• Diff Power: 0.60

DAMPERS

AERO

• Front Splitter: 3 clicks (low-medium, minimize drag for Mulsanne)
• Rear Wing: 4 (of 10 — low downforce config for top speed on straights)
• Downforce Level: Low — Le Mans specific low-drag trim
• Brake Ducts: Front 4 / Rear 3 (moderate cooling, long braking zones at Mulsanne/Indianapolis/Arnage but huge straights to cool)

KEY SETUP NOTE

• Le Mans without chicanes demands the lowest-drag setup the M4 GT3 can run while still surviving Porsche Curves and the Ford Chicanes-turned-flat-out kinks — prioritize straight-line speed over cornering grip since roughly 70% of the lap is spent at or near full throttle; sacrificing some esses stability for reduced rear wing angle is the correct trade.

TRACK GUIDE

• Mulsanne Straight braking zones (into Mulsanne Corner): brake as late as possible but in a straight line — the M4's stability under trail braking is good, but with low rear downforce trim, avoid trail-braking too deep or the rear will step out; get brake pressure down early, rotate mid-corner.
• Porsche Curves: this is where lap time is won — carry maximum minimum speed, trust the aero platform, use curbs on entry to Porsche 1 aggressively but stay smooth on exit curbs to protect rear tyres over a race stint.
• Arnage: a tight, technical hairpin-like right — get all braking done early, prioritize a clean rotation over apex speed, since exit acceleration onto the Porsche Curves approach matters more.
• Indianapolis: fast, sweeping downhill right-hander — trust the