The full specifications of the Lexus IS-F and the 5.0 litre V8 engine has finally been announced, and the new performance Lexus sedan is now on sale in Japan, coming from Toyota Motor Corporation’s Tahara Plant in Aichi. Lexus reveals that the F in IS-F comes from the F in Fuji Speedway, at which the Lexus IS-F was extensively tested at.
The new Lexus IS-F uses the 2UR-GSE, a variant of the 5.0 litre V8 2UR-FSXE that goes into the Lexus LS600h without the Lexus Hybrid Drive, and has different tuning. The 2UR-GSE makes 423 PS at 6,600rpm and 505Nm of torque at 5,200rpm. It is a high compression engine with a compression ratio of 11.8:1. It has the same 94mm bore as the 4.6 litre unit in the LS460 but is stroked up from 83mm to 89.5mm to enlarge it’s displacement to 5.0 litres.
Fuel is delivered via a D-4S fuel injection system which incorporates both direct injection and conventional port injection. Dual VVT-i provides variable valve timing on both the intake and exhaust cams, and the intake cams use VVT-iE, which varies the cam using an electric motor instead of conventional mechanical methods.
A dual-intake system provides good torque at low to medium engine speeds, with additional air inlets opening at high revs. Lexus has managed to get the engine to produce three different intensities of engine roar as the needle moves up the rev range.
This engine is mated to an 8-Speed Sport Direct Shift transmission which is based on the 8-speed unit in the LS460, but tuned for more sporty intentions. In gears 2 to 8, the engine and transmission has a direct lock-up connection while the first gear uses a conventional torque converter to transmit power so that the car can launch smoothly. The transmission also automatically blips the throttle to smoothen downshifts.
The entry level IS250 is already in Malaysia thanks to Lexus Malaysia – will they introduce the IS-F here for those who feel adventurous and want to try out the Japanese luxury automaker’s first high performance model?
Check out more photos of the Lexus IS-F in my previous post.
2007 Lexus IS-F: a performance Lexus sedan!