Toyota RI4AG engine

The Toyota RI4A/RI4AG is a prototype four-stroke 2.0-litre single-turbocharged inline-4 racing engine, developed and produced by Toyota, for the Super GT series and the Japanese Super Formula series. The RI4AG engine is fully custom-built.^[1][2]

Toyota RI4A/RI4AG
Overview
Manufacturer	Toyota Gazoo Racing
Production	2014-present
Layout
Configuration	Inline-4
Displacement	2.0 L (122 cu in)
Cylinder bore	86–90 mm (3.39–3.54 in)
Piston stroke	Free but typically approximately between 86–90 mm (3.39–3.54 in)
Block material	Die cast steel or aluminium alloy. Machining process from a solid is not permitted
Head material	Die cast steel or aluminium alloy
Valvetrain	DOHC 16-valve (four-valves per cylinder)
Compression ratio	15:1
Combustion
Turbocharger	Single-turbocharged by Garrett Advancing Motion with 3.5 bar (51 psi) of turbo boost pressure
Fuel system	Bosch HDEV6 350 bar (5,076 psi) central high-pressure gasoline direct fuel injection. One direct injector per cylinder fed by an engine-driven high-pressure fuel pump
Management	Bosch Motronic MS 7.4
Fuel type	Various (102 RON unleaded racing gasoline)
Oil system	Dry sump
Cooling system	Single mechanical water pump feeding a single-sided cooling system
Output
Power output	550–650 PS (542–641 hp; 405–478 kW)
Torque output	500–700 N⋅m (370–520 lbf⋅ft)
Dimensions
Length	600 mm (23.62 in)
Width	697 mm (27.44 in)
Height	693 mm (27.28 in)
Dry weight	187 lb (85 kg) including turbocharger

Applications

• Dallara SF14
• Dallara SF19
• Lexus RC-F GT500^[3][4][5]
• Toyota GR Supra GT500^[6]

References

1. "Toyota GR Supra GT500 Racecar Sounds Insane Testing for the 2020 Super GT Series". 28 December 2019.
2. "The Four-Cylinder 2020 Supra Super GT Car Sounds Bizarre". 27 September 2019.
3. "A GT500 Racer in Detail". 26 May 2015.
4. "2014 Lexus RC F GT500 | Lexus". 22 April 2016.
5. https://www.topgear.com/car-news/motorsport/dear-lord-it%E2%80%99s-lexus-rc-f-gt500^{[bare URL]}
6. "GR Supra | GR Supra".