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Setup Guides / iRacing / Ligier JS P320 @ Road Atlanta

Ligier JS P320

Road Atlanta · iRacing · Updated Oct 10, 2026
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// Race · Dry

TYRES

  • Slick (Dry compound), Front: 139 PSI, Rear: 137 PSI, No tyre blankets permitted (LMP3 — cold set)
  • Note: LMP3 pressures are hot-target focused; start cold at ~137/135 PSI front/rear, build to ~139/137 PSI hot stint average.

ELECTRONICS

  • TC: 3 (moderate — aggressive corner exit without excessive wheelspin)
  • ABS: 2 (low intervention for late trail-braking control)
  • Engine Braking Map: 4 (mid-high, aids rotation into T1/T10)
  • Brake Bias: 53.5% front (cockpit adjustable, +/-1% per stint as fuel burns)

SUSPENSION

  • // FRONT
  • Ride Height: 55 mm
  • Wheel Rate FL / FR: 145,000 N/m / 145,000 N/m
  • ARB: 220,000 N/m
  • Brake Torque Multiplier: 100%
  • Brake Bias: 53.5%
  • // REAR
  • Ride Height: 60 mm
  • Wheel Rate RL / RR: 130,000 N/m / 130,000 N/m
  • ARB: 160,000 N/m
  • Diff Preload: 45 Nm
  • Diff Coast: 0.5
  • Diff Power: 0.4

DAMPERS

Slow BumpSlow ReboundFast BumpFast Rebound
FL4200 Nsm5800 Nsm2100 Nsm2900 Nsm
FR4200 Nsm5800 Nsm2100 Nsm2900 Nsm
RL3600 Nsm5200 Nsm1800 Nsm2600 Nsm
RR3600 Nsm5200 Nsm1800 Nsm2600 Nsm

AERO

  • Front Wing: 3 (of 5 click range — balanced for T5 esses stability)
  • Rear Wing: 6 (of 10 — favors braking stability T10A over straight speed)
  • Downforce Level: Medium-High (circuit-specific — prioritizes T5 and T10 over back straight top speed)
  • Brake Ducts: Front 2 / Rear 3 (manage temps over stint, LMP3 brakes run hot under aggressive late braking)

KEY SETUP NOTE

  • The JS P320's weak point under aggressive driving is rear stability on trail-brake entry at T10A — slightly higher rear ride height (60mm) and softer coast diff (0.5) prevent snap oversteer on the heavy chicane braking zone while still allowing the rotation needed for late-braking into T1 and T12.

TRACK GUIDE

  • T1: Brake late but straight-line first, trail off gradually — the JS P320's front aero load builds progressively, don't ask for rotation and max brake pressure simultaneously.
  • T5 Esses: Commit fully, minimal steering correction — this car rewards a planted rear through here; any mid-corner lift upsets balance for the next three apexes.
  • T10A/10B Chicane: This is where races are won/lost — brake 3-5m later than feels comfortable, but prioritize stability over outright late braking; a missed rotation here costs the entire run to T12 and down the main straight.
  • T12: Traction is everything — get the car rotated early, get on throttle progressively, sacrifice minimal entry speed for a clean exit onto the longest ac
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