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Porsche AG with BorgWarner TorqTransfer Systems

The BorgWarner High Energy ITM3e AWD System

The design, engineering, and realization of an innovative AWD system means optimizing traction and driving dynamics. Porsche's objective was to replace passive viscous coupling with a low-weight, network-capable, active, electronically-controlled system to provide improved traction, increased safety, good handling, and a confident driving experience. Porsche's collaboration with BorgWarner TorqTransfer Systems resulted in Porsche Traction Management (PTM), a dynamic mechanical system, with active gerotor pump, thermal management, and new all-wheel drive control algorithms for a high-performance sports car.

The Porsche 911 Turbo AWD has unique performance requirements. The front and rear wheels turn at slightly different speeds. While providing some AWD benefits, the typical passive viscous coupling provides limited compatibility with advanced Electronic Safety Stability (ESP) systems. Porsche was searching for a system that provided outstanding AWD dynamic improvements, but compatible with its advanced stability systems. The project pushed the knowledge boundary on applied interactive torque management devices, affecting performance, power use, and energy consumption.

With over a year of modelling completed, the engineering team at Porsche knew precisely what they needed; BorgWarner understood how their own torque management technology could be adapted to meet Porsche's needs.

With weeks remaining in development time, close collaboration between Porsche and BorgWarner was essential, to share expertise and innovate. Both teams were on hand in Porsche's labs and for testing on the track.

Precise specification and open communication helped a combined team make technological leaps quickly. Through side by side collaboration, Porsche and BorgWarner engineers succeeded in building a system that had not existed before, from a hardware or controls standpoint.

BorgWarner's interactive torque management know-how, electronic controller (ECU), and control algorithms combined with Porsche's engineering expertise and precise vehicle tuning to give this vehicle racing performance and on-road drivability. The result is a truly exceptional driving experience. The new 911 Turbo is Porsche's best handling sports car to date.