New 2026 Toyota GR GT - All Colors & Engine Sounds | Monster V8 Hybrid Supercar
The GR GT’s 4.0-liter, V8 twin-turbo engine, which is TMC’s first to be fitted in a production vehicle, was developed based on a “thoroughly compact and light” design concept toward achieving the GR GT’s “packaging of low overall height and a low center of gravity”. With a bore and stroke of 87.5 x 83.1, the engine’s short stroke reduces overall engine height, while its hot V configuration positions one of its two turbos in each engine bank. The engine also features dry-sump lubrication and an oil pan that has been made thinner than usual.
The engine’s power is transmitted to the rear transaxle via a CFRP torque tube. In addition to a motor-generator, the transaxle integrates a newly developed 8-speed automatic transmission, which uses a wet-start clutch in place of a torque converter, and a mechanical limited-slip differential. The motor-generator, which is positioned in front of the transmission, is used to help make up for the momentary lag in torque response that occurs during acceleration and gear changes. While providing a direct feel that surpasses that of the GAZOO Racing Direct Automatic Transmission used in the GR Yaris and GR Corolla, the 8-speed automatic transmission of the GR GT is being developed toward achieving world-class shift speed, as well as shift control that allows shift manipulation at will, even when in D-range automatic shift mode. To minimize the wheelbase in consideration of overall vehicle packaging, the rear transaxle, after relaying to its far end the power that has been conveyed from the engine and through the electric motor and automatic transmission, uses a conical gear to reverse the direction of that power, which then turns the driveshaft through the mechanical limited-slip differential. This structure is unique among front-engine, rear-wheel-drive vehicles and represents the optimization for use in the GR GT of the mechanism used in all-wheel-drive vehicles.
With performance in mind, the development target for maximum system output is 641 hp or greater, and the development target for maximum system torque is 627 lb-ft or greater. Also, the adoption of a rear transaxle and the optimal placement of the drive battery, fuel tank, and other heavy components have resulted in a 45:55 front-to-rear weight distribution, contributing to ease of vehicle handling.
Development of the powertrain involved advancing studies through the use of race development driving simulators and system benches onto which entire powertrain systems could be mounted, while consideration was also given to thermal management, mounting position, and serviceability. To ensure continued sales, development is being undertaken to comply with increasingly stringent emissions regulations. The GR GT3 also features a 4.0-liter, V8 twin-turbo engine—many of the structural components of which are shared with those of the engine in the GR GT.
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