BMW M4 GT3 (2021)

TYRES

• Compound: Dry (slick) — Optimal operating window: 90–100°C (peak grip 92–96°C core temp)
• Front pressure: 26.8 PSI (cold/static, hot target ~27.5–28.0 PSI)
• Rear pressure: 26.5 PSI (cold/static, hot target ~27.2–27.7 PSI)
• Tyre blanket temp: 80°C (max allowed in ACC, applied both axles)

ELECTRONICS

• TC1: 3
• TC2: 1
• ABS: 4
• Engine Map: 1 (max power, qualifying attack)
• Brake Bias: 56.5%
• Brake Driver (pedal sensitivity): 80%

SUSPENSION

• // FRONT
• Ride Height: 53 mm
• Wheel Rate FL / FR: 185000 N/m / 185000 N/m
• ARB: 6 (front scale 1–10)
• Brake Torque Multiplier: 100%
• Brake Bias: 56.5%
• // REAR
• Ride Height: 60 mm
• Wheel Rate RL / RR: 165000 N/m / 165000 N/m
• ARB: 4 (rear scale 1–10)
• Diff Preload: 60 Nm
• Diff Coast: 0.4
• Diff Power: 0.6

DAMPERS

AERO

• Front Splitter: 6
• Rear Wing: 7
• Brake Ducts Front: 2
• Brake Ducts Rear: 3
• (Moderate-high downforce bias for Pouhon/Blanchimont stability, splitter trimmed for Kemmel top speed)

KEY SETUP NOTE

• Spa demands a rear-biased stiffness compromise: too much rear ARB/spring snaps the car loose on Eau Rouge compression and Blanchimont, but too soft kills traction at Rivage and Bus Stop exit — the 6F/4R ARB split with slightly softer rear slow-bump damping keeps the rear planted through the compression without sacrificing exit traction, which is the single biggest lap-time differentiator on this track.

TRACK GUIDE

• La Source: brake very late from ~130m, trail-brake deep to rotate the nose, get on power early even if it means a wider exit — the run to Eau Rouge rewards exit speed far more than apex precision.
• Eau Rouge/Raidillon: full commitment flat in quali trim; stay dead-center on the curbs, any steering input mid-compression unsettles the rear — trust the setup, minimal correction.
• Kemmel Straight: use DRS-style slipstream positioning if in traffic; this is pure aero efficiency — the wing/splitter trim above balances drag loss vs Pouhon downforce need.
• Les Combes: brake in a straight line, late and hard (ABS 4 helps stability), rotate on entry, sacrifice a fraction of min-speed for a clean early-exit line into the Rivage approach.
• Pouhon: this is where lap time is won — carry maximum entry speed on a stable platform; the double apex rewards confidence in front grip, trust the 6-click front ARB for sharp direction change without understeer.
• Blanchimont into Bus Stop: near-flat commitment, car must stay planted — any instability here costs the entire Bus Stop entry; brake late, ride the curbs aggressively per aggressive style, but keep it symmetrical to avoid unsettling the diff.