BorgWarner’s R2S turbo tech boosts engine per­for­mance

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BorgWarner pro­vides its lead­ing reg­u­lated two-stage (R2S) tur­bocharger for Daim­ler’s lat­est 2.9-litre six-cylin­der in­line diesel engine OM 656, which is ini­tially fea­tured in the up­dated Mercedes Benz S-Class launched in 2017. Meet­ing the re­quire­ments of sta­teof-the-art engine con­cepts, BorgWarner’s ad­vanced tur­bocharg­ing tech­nol­ogy con­trib­utes to en­hanced fuel econ­omy and im­proves torque, per­for­mance and ex­haust gas re­cir­cu­la­tion rates even un­der full-load con­di­tions while sig­nif­i­cantly re­duc­ing emis­sions.

“Due to its op­ti­mised de­sign, our tur­bocharg­ing so­lu­tion helps au­tomak­ers over­come chal­leng­ing sys­tem place­ment de­mands such as a tight fit and high tem­per­a­tures,” Frédéric Lissalde, Pres­i­dent and Gen­eral Man­ager, BorgWarner Turbo Sys­tems, said. “We are pleased to sup­port our cus­tomers by de­liv­er­ing our highly ef­fi­cient R2S tur­bocharg­ing tech­nol­ogy to meet the high­est pos­si­ble stan­dards.”

The first R2S tur­bocharger on the mar­ket to have a tur­bine hous­ing made of very ro­bust cast steel also fea­tures a wa­ter-cooled e-ac­tu­a­tor, bear­ing hous­ing and com­pres­sor hous­ing. BorgWarner’s R2S tur­bocharg­ing so­lu­tion con­sists of 2 tur­bocharg­ers ar­ranged in se­ries – a com­pact high- pres­sure ex­haust gas tur­bocharger fea­tur­ing the com­pany’s lat­est vari­able tur­bine ge­om­e­try tech­nol­ogy and 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 low­pres­sure tur­bocharger which takes over the main com­pres­sion work to pro­vide high boost pres­sures with ex­cel­lent ef­fi­ciency. Con­trolled by an elec­tri­cal ac­tu­a­tor, BorgWarner’s R2S tur­bocharg­ing tech­nol­ogy adapts quickly to chang­ing sit­u­a­tions for fast re­sponse and sig­nif­i­cantly re­duced emis­sions.

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