BorgWarner R2S Turbocharger Image

BorgWarner has developed a new integrated 2-stage turbocharger called the R2S system, which uses two differently sized turbochargers in a sequential arrangement.

The smaller of the two turbochargers is a smaller conventional unit that provides quick boost response at low engine speeds, while the larger turbocharger is of the Variable Turbine Geometry type, which uses variable vanes to suit a wider range of engine operating states.

The first mass production petrol car that used VTG turbocharging was the 997 Porsche 911 Turbo, which also used BorgWarner turbochargers.

The first application of this new R2S turbocharger is the Ford PowerStroke 6.4 litre V8 diesel engine, which will go into the F-series of heavy duty pickups – the F250, F350, F450 and F550. The same engine will also be used by Navistar International, which will use the engine under the MaxForce7 brand in its light trucks.