The upgrade, applied to both the GT and GTS variants, increases maximum power on the turbocharged 3.0-litre straight six engine from 250kW to 285kW, delivered between 5800rpm and 6500rpm. Compression ratio has been lowered to 10.2:1 with the retune, too.
Maximum torque of 500Nm is unchanged, but now delivered across a broader rev range – 1800rpm to 5000rpm.
The result is a claimed 0.2 second improvement in the sports coupe’s 0-100km/h sprint time, now at 4.1 seconds. Fuel economy is unchanged, at 7.7lt/100km on the combined cycle.
To support the increased engine performance, dual strut braces have been added to enhance handling and prevent chassis flex during cornering.
The only other change with the upgrade is the addition of Supra branding on the brake calipers of the GTS variant.
Unchanged GR Supra features include the eight-speed automatic transmission, launch control function and selectable driver modes, as well as all the standard comfort, technology, infotainment and safety features.
The range of seven racetrack-themed colours, including the GTS-exclusive Nurburg Matte Grey, all carry over unchanged, as do GTS-specific features like 19-inch alloys, head-up display and a 12-speaker JBL audio system.
"This upgrade for GR Supra will continue our quest to deliver ever-better cars, with more power and under-bonnet bracing that will further enhance the thrilling driving experience offered by this iconic car," said Toyota Australia’s Vice President of Sales and Marketing, Sean Hanley.
Pricing for the updated GR Supra starts at $87,126 for the GT and $97,126 for the GTS (RRP, excluding on-road costs).