Toyota Supra GT4 Cup 2019

TYRES

• Slick (GT4 spec, single compound), Front 27.0 PSI cold (target ~30 PSI hot), Rear 27.5 PSI cold (target ~30.5 PSI hot). No tyre blankets assumed — first lap is a warm-up lap, pressures chosen to reach window quickly on in-lap/out-lap sequence for qualifying.

ELECTRONICS

• TC: 2 (low, allows rotation on corner exit under aggressive throttle)
• ABS: 3 (moderate, supports late braking stability into Turn 1 and Turn 5)
• Engine Braking: Medium (3/5 if car exposes a scale — stabilizes rear on trail-braking)
• Brake Bias: 56.5% front (quoted in BRAKES section below also)

SUSPENSION

• // FRONT
• Ride Height: 58 mm
• Wheel Rate FL / FR: 95,000 N/m / 95,000 N/m
• ARB: 14,000 N/m
• Brake Torque Multiplier: 100%
• Brake Bias: 56.5%
• // REAR
• Ride Height: 62 mm
• Wheel Rate RL / RR: 88,000 N/m / 88,000 N/m
• ARB: 10,000 N/m
• Diff Preload: 40 Nm
• Diff Coast: 0.4
• Diff Power: 0.6

DAMPERS

AERO

• Front splitter: 2 (fixed low-drag GT4 setting), Rear wing: 4 (of typical 0–6 range), Downforce bias slightly rearward for high-speed stability through Turns 1, 5, and 8. No adjustable brake ducts on this model.

KEY SETUP NOTE

• Portimao's elevation changes (especially the blind crest at Turn 1 and the downhill compression into Turn 5) unload the front tyres mid-corner — running slightly stiffer front ARB and lower front ride height than default sharpens turn-in without triggering snap oversteer on the crest, critical for one-lap confidence at maximum commitment.

TRACK GUIDE

• Turn 1 (Turn Uno): Blind, uphill-to-crest braking zone — brake slightly earlier than feels natural since the car goes light at the apex; trail-brake to rotate, don't commit full lock until you see the exit.
• Turn 5 (Curva do Boneco, downhill compression): Carry momentum, let the chassis settle through the compression before applying throttle — early throttle here unsettles the rear on GT4 power delivery.
• Turns 7-9 (uphill esses): Minimize steering input, use curbs aggressively on exit of 8 to carry speed into the short straight — this sector rewards smoothness over late braking.
• Turn 13-14 (final corners onto main straight): This is where lap time is won — late apex, get the power down early even if it costs a tenth on rotation, since the following straight is long and exit speed compounds.
• Overall: Portimao's elevation changes mean visual reference points are deceptive — commit to braking markers from memory/data rather than visual cues on blind crests.