The Toyota LR engine is a V10 piston engine built by Toyota.
1LR-GUE
Announced in the Lexus LFA sports car, the 1LR-GUE is a 4,805 cc (293 cu in) DOHC engine. The engine is made from aluminium alloy, magnesium alloy and titanium alloy and is smaller than most V8s.
The oil and water pumps are located at the rear of the engine and the lubrication system uses a dry sump. Titanium is used for the valves and the rocker arms have a diamond-like coating. Each cylinder has an independent, electronically controlled throttle body.
Yamaha was contracted to co-develop the 1LR-GUE.
Maximum power output is 411.5 kW (552 hp) at 8,700 rpm. Maximum torque is 480 N·m (354 ft·lb) at 6,800 rpm. The engine will rev to 9500 rpm, with 90% of its peak torque available from 3,700 rpm to 9,000 rpm. Due to the speed at which the engine revs, an LCD tachometer was fitted to the LF-A as an analog fixture allegedly could not keep up with the engine's speed of revolution.
Bore × stroke (mm): 88.0 × 79.0
Compression ratio: 12.0:1
V angle: 72 degrees
Applications: