Toyota’s new 2.0-litre 8AR-FSE engine will soon debut in the Lexus IS 200t that will hit various markets across the world from September onwards. First used in the NX 200t, the highly-advanced four-cylinder turbo engine makes its third appearance in a Lexus model having also been confirmed for the RX 200t to be launched also later this year.
The IS 200t will nevertheless mark the new engine’s first appearance in a longitudinal installation driving its rear wheels – the NX and RX mount their engines transversely. In the IS 200t, the engine drives its rear wheels through an 8-speed automatic transmission trickled down from the RC F high-performance model.
Outputs are quoted at 245hp and 350Nm, a 10hp increase from what’s offered in the NX 200t and significantly up from 205hp and 252Nm available from the current IS 250 which it is meant to replace. En route to a claimed top speed of 230kph, the IS 200t is able to hit 100kph from rest in 7.0 seconds with average fuel consumption rated at 7.0 l/100km.
As detailed in previous coverage of this engine in the NX 200t as well as its 6AR naturally-aspirated sibling in the new Toyota Camry, the 200t’s 8AR mill is a confluence of some of the latest and most advanced powertrain technologies. Its water-cooled cylinder head features an integrated 4-2 exhaust manifold which the respective cylinders according to their relative combustion cycles thus preventing interference between the exhaust gases of each cylinder.
This innovative manifold design works in tandem with a twin-scroll turbocharger that is bypassed at low engine loads by a variable waste gate valve control to minimize unwanted backpressure when boost is not needed. An air-to-liquid intercooler mounted directly to the engine helps to significantly reduce the intake volume downstream of the turbocharger thus minimising turbo lag.
Feeding fuel into the cylinders is a dual injection system featuring both direct and port fuel injection allowing the engine to experience the best qualities of the respective injection systems based on engine load. The engine’s VVT-iW valvetrain control system is able to vary timing of the intake valve by a sufficiently large margin that the engine is able to alternate seamlessly between Otto and Atkinson combustion cycles – the latter cycle requires a much later closing of the intake valve well into the compression stroke.
Pictures: Official Lexus release.