Home News BorgWarner’s new R2S turbochargers enhance fuel economy

BorgWarner’s new R2S turbochargers enhance fuel economy

BorgWarner’s new R2S turbochargers enhance fuel economy

Michigan, USA, October 25, 2017

BorgWarner has deployed its regulated two stage (R2S) turbocharger in Daimler’s latest 2.9 litre six cylinder in-line diesel engine OM 656, initially featured in the 2017 Mercedes Benz S-Class.

“Due to its optimized design, our turbocharging solution helps automakers overcome challenging system placement demands such as a tight fit and high temperatures,” said Frédéric Lissalde, President and General Manager, BorgWarner Turbo Systems.

Meeting the requirements of state-of-the-art engine concepts in order to reduce emissions, BorgWarner’s advanced turbocharging technology contributes to enhanced fuel economy and improves torque, performance and exhaust gas recirculation rates even under full-load conditions. This is the first R2S turbocharger on the market to have a turbine housing made of robust cast steel. It also features a water-cooled e-actuator, bearing housing, and compressor housing. The R2S turbochargers are arranged in series. The first is a high-pressure exhaust gas turbocharger featuring the company’s latest variable turbine geometry technology. The second is a larger waste-gated low-pressure one with ported shroud compressor.

While running at low engine speeds, the small high-pressure turbocharger provides most of the boost and at the same time excellent response, so that the driver does not experience any turbo lag. With increasing engine speed, a bypass begins to open, so that nearly all of the gases flow directly towards the low-pressure turbocharger which takes over the main compression work to provide high boost pressures with excellent efficiency. Controlled by an electrical actuator, the turbocharger technology adapts quickly to changing situations for fast response and significantly reduced emissions.

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