BMW M4 GT3 (2021)

TYRES

• Dry compound (V7), Front pressure: 27.0 PSI, Rear pressure: 26.7 PSI (cold/box targets — race stint average)
• Optimal operating window: 80–95°C front and rear for peak grip; avoid exceeding 100°C to limit thermal degradation over stint
• Tyre blanket temp: 80°C (standard pre-heat, both axles)

ELECTRONICS

• TC1: 4, TC2: 2, ABS: 4, Engine Map: 3 (balanced power/fuel for race distance), Brake Bias: 58.5%, Brake Driver (pedal sensitivity): 80%

SUSPENSION

• // FRONT
• Ride Height: 57 mm
• Wheel Rate FL / FR: 165 N/mm / 165 N/mm
• ARB: 6
• Brake Torque Multiplier: 95%
• Brake Bias: 58.5%
• // REAR
• Ride Height: 65 mm
• Wheel Rate RL / RR: 150 N/mm / 150 N/mm
• ARB: 5
• Diff Preload: 70 Nm
• Diff Coast: 0.4
• Diff Power: 0.6

DAMPERS

AERO

• Front Splitter: 5, Rear Wing: 6, Brake Ducts F/R: 3 / 3 (balanced cooling for long-run deg management under aggressive braking)

KEY SETUP NOTE

• Indianapolis punishes cars that can't rotate cleanly through Turns 1, 7 and 16 (the technical infield) while surviving the long full-throttle oval-style front straight and Turn 9/10 kink — run slightly stiffer front ARB (6) with modest rear wing (6) to maximize front-end bite for late braking without sacrificing straight-line stability; manage rear tyre temps closely as aggressive diff power (0.6) combined with hard traction exits on the infield will accelerate rear deg faster than front.

TRACK GUIDE

• Turn 1 (hairpin after front straight): brake late but in a straight line — any trail-braking rotation here must be controlled, as overcommitting unsettles the rear for the exit onto the back section.
• Turns 7–9 (infield esses): this is where aggressive rotation pays off — trail brake deep into 7, carry rotation through 8, and prioritize a clean, early-throttle exit at 9 for the run to the oval section.
• Turn 10 (oval rejoin): minimize steering input, let the car ride the banking flat if possible — this is a time-gain zone through car stability, not bravery.
• Turn 16 (final corner): compromise entry speed slightly for a strong exit — this feeds the longest straight (front straight), so exit traction here is worth more lap time than a hero entry.
• Tyre/fuel management: short-shift out of Turn 7 and 16 by half a gear in the mid-stint to preserve rear tyre life; use lift-and-coast of 5-10m before Turn 1 every 3-4 laps to manage brake and tyre temps without losing significant pace.

THEORETICAL BEST LAP

• 1:48.300 — optimal sector composite, dry track, low fuel, fresh tyres, simulated ideal lap

REAL W