Mercedes-AMG GT4

TYRES

• Slick — Medium compound, F: 2.05 bar / R: 2.00 bar (hot target 2.10–2.20 bar F/R). Optimal tyre operating window: 85–95°C for peak grip. Blanket temp (if used): 80°C.

ELECTRONICS

• TC: 4 (GT4 spec, fixed range 1–6) / ABS: 5 / Engine Braking: Medium / Brake Pressure: 96% / Brake Bias: F: 56% / R: 44%

DRIVETRAIN

• Fuel Map: Map 2 — balanced mixture, slight lean for race-long consistency, preserves engine temp under Kemmel/Blanchimont full-throttle load
• Gear Ratios:
• 1st – 3.083
• 2nd – 2.294
• 3rd – 1.850
• 4th – 1.545
• 5th – 1.286
• 6th – 1.107
• Final Drive – 3.727

SUSPENSION

• // FRONT
• Ride Height: 60 mm
• Wheel Rate FL / FR: 28,500 N/m / 28,500 N/m
• ARB: 3,200 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 56%
• // REAR
• Ride Height: 63 mm
• Wheel Rate RL / RR: 25,000 N/m / 25,000 N/m
• ARB: 2,600 N/m
• Diff Preload: 40 Nm
• Diff Coast: 0.35
• Diff Power: 0.55

DAMPERS

AERO

• Front Splitter: 4 clicks (of 6) / Rear Wing: 5 clicks (of 8) / Downforce Level: Medium-High / Brake Ducts: F 2 / R 3 (moderate cooling, race-length stint management)

KEY SETUP NOTE

• The GT4 Mercedes has less aero grip than the GT3 sibling, so rear stability through Eau Rouge/Raidillon and Blanchimont depends heavily on mechanical rear grip — keep rear ARB soft relative to front and avoid overloading rear dampers on compression, or the car will step out under load exactly where confidence is critical.

TRACK GUIDE

• La Source: brake hard but progressively — GT4 has less front bite than GT3, trail brake smoothly to rotate without locking the fronts, apex late for a strong run down to Eau Rouge.
• Eau Rouge/Raidillon: commit flat only if stable in practice runs — with GT4-level downforce, a small lift may be needed early in the stint on cold tyres; keep the car straight on the compression, avoid curb abuse on entry.
• Les Combes: this is a big lap time zone — late braking rewarded, but car must be settled before turn-in; use the inside curb lightly on exit for traction onto the next section.
• Pouhon: needs a stable, planted platform — trust the