Aston Martin Vantage GT4

TYRES

• Compound: Dry
• Front: 29.0 PSI cold set
• Rear: 27.5 PSI cold set
• Tyre blanket: N/A (not used on this car in iRacing)

ELECTRONICS

• TC: 3 (lower than reference for max attack, single hot lap, cold-ish track reduces slip risk)
• ABS: 5
• Engine Braking / Brake Magic: N/A (fixed on this car)
• Brake Bias: 57.5% front (slightly forward of reference to support late braking stability into T1/T5)

SUSPENSION

• // FRONT
• Ride Height: 55 mm
• Wheel Rate FL / FR: 145000 N/m / 145000 N/m
• ARB: 28 N/m (max firm setting available)
• Brake Torque Multiplier: 100%
• Brake Bias: 57.5%
• // REAR
• Ride Height: 58 mm
• Wheel Rate RL / RR: 125000 N/m / 125000 N/m
• ARB: 18 N/m
• Diff Preload: 30 Nm
• Diff Coast: 0.45
• Diff Power: 0.60

DAMPERS

AERO

• Front splitter: fixed (no adjustment on GT4 Vantage)
• Rear wing: 2nd highest hole position (second from max angle) for Summit Point's high-speed flowing nature while still needing front-rear balance under heavy braking
• Downforce level: max mechanical grip bias, wing angle moderate-high
• Brake ducts: Front 2 / Rear 1 (cool enough for single lap, minimal drag cost)

KEY SETUP NOTE

• Summit Point Raceway rewards front-end bite into the fast, off-camber Turn 1 and the uphill Turn 5 complex — running slightly stiffer front ARB and forward brake bias vs. the reference lap sharpens turn-in without sacrificing rear stability on the bumpy exit kerbs, which is the main limiting factor for one-lap pace in the GT4 Vantage here.

TRACK GUIDE

• Turn 1: Late, trail-braked entry — car wants to understeer here cold; carry slight rotation off brake release, don't lift early.
• Turn 5/6 Uphill esses: Commit flat or near-flat if rotation is clean from Turn 4; this is the biggest lap time swing zone — a tidy exit here carries speed down the back straight.
• Turn 8 (Karussell-style sweeper): Trail brake deep, let the car rotate on entry, get back to throttle progressively to avoid snap oversteer on exit kerb.
• Final corner onto front straight: Traction is king — slightly earlier, smoother throttle application beats an aggressive late apex that unsettles the rear.
• Kerb usage: Attack entry kerbs lightly, but respect exit kerbs at Turns 6 and 9 — the GT4 Vantage's rear can step out quickly if unsettled mid-corner.