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Mercedes selects BorgWarner R2S technology for S250 CDI engine

ABR Staff Writer Published 18 January 2012

German luxury carmaker Mercedes-Benz has selected BorgWarner's regulated two-stage (R2S) turbocharging technology for its four cylinder 2.2-liter diesel engine of new Mercedes S250 CDI BlueEFFICIENCY model.

The German carmaker said that the BorgWarner's R2S turbocharging technology was chosen to develop modern engine featuring low-end torque, responsiveness, high output, low emissions and improved fuel efficiency.

BorgWarner president and general manager of turbo systems passenger car products Frederic Lissalde said the company's turbocharging technology meets the demands in performance, fuel economy and emissions.

"We are pleased to collaborate with Mercedes-Benz to set new benchmarks for powerful downsized diesel engines in the luxury segment without compromising performance," Lissalde said.

The R2S system features a small KP39 high-pressure exhaust gas turbocharger which is first driven by the exhaust gas that revolves up to 215,000 rpm and one large K04 low-pressure exhaust gas turbocharger.

BorgWarner has incorporated a bypass into the high-pressure turbine casting which facilitates the turbines to be controlled depending on engine speed and generate optimum boost pressure over the entire engine speed range with enhanced torque characteristics.

According to BorgWarner, the R2S turbocharging technology meets the requirements of modern engine concepts and allows maximum exhaust gas recirculation rates during full load conditions while reducing NOx emissions.

The company said that the engine provides maximum torque from 1,600 rpm in the S 250 CDI and will achieve a fuel consumption rating of about 5.7 liters per 100km (41 mpg).