虽然最新款雷克萨斯IS由于优异的操控性而受到广泛好评,但这款运动车仍存在一个小的缺陷,那就是入门级车型搭载的引擎,IS250仍搭载一台老旧且动力不足的2.5升V6引擎。为了给那些不想要IS 350所搭载的3.5升V6引擎的消费者一个动力更强劲的引擎选择。据Motor Trend报道，雷克萨斯将为IS提供一台2.0升四缸涡轮增压引擎。这台引擎首次配备在NX跨界车上，IS搭载该引擎后将使其具备直面所有涡轮增压版竞争车型。其功率达到235马力，扭矩258磅-英尺（约合350牛米），相对于老旧的2.5升V6引擎204马力和184磅-英尺（约合250牛米）的功率和扭矩提升幅度明显。虽然该引擎几乎铁定能在2016年出现在IS的引擎盖内，但目前仍有两个因素不能确定，首先这台引擎仅仅是对于2.5升V6引擎的补充还是完全把它替换掉，而2.5升V6版本仍不失为一个性价比更高的选择。另外，搭载四缸涡轮增压引擎的车型将被命名为什么——如果该车成为入门级车型，是否会被称为IS200t或是IS 250，而如果2.5升V6仍保留，雷克萨斯可能会重新使用IS300这个名称。

Lexus IS  to get 2.0L turbo four-cylinder

While the latest Lexus IS has received almost universal praise for its engaging handling, one chink in the sport sedan's armor has been its base motor, the IS 250's antiquated and underpowered 2.5-liter V6.

To provide buyers who don't want to step up to the IS 350's 3.5-liter V6 with a more enticing engine option, Lexus will offer the IS with a turbocharged 2.0-liter four-cylinder, according to a Motor Trend report.

The engine, which first debuted in the NX compact crossover, will allow the IS to compete more directly with its rivals, nearly all of which offer forced-induction fours. It produces 235 horsepower and 258 lb-ft of torque, figures that significantly best the decade-old 2.5-liter V6's 204 ponies and 184 lb-ft of twist.

While the new mill will almost certainly make its way under the IS' hood by 2016, two uncertainties remain. It's unclear whether it will supplement or supplant the 2.5-liter V6, which could stick around as a value option. Also a mystery is what the turbo four-cylinder model will be called - if it becomes the entry-level sedan, it could be named the IS 200t or IS 250, but if the small six stays, Lexus could dust off the IS 300 nameplate.