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| PORSCHE WINS TWO PACE AWARDS FOR 911 TURBO |
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A large turbocharger, on the other hand, responds poorly at low engine speeds due to its larger cross-section and higher turbine mass while offering the advantage of lower exhaust gas counter-pressure under high air throughput.
Variable turbine geometry serves to alter the cross-sections by way of rotor blades directly in the flow of exhaust gases, providing exactly the right turbocharger size and effect in each situation: At low engine speeds the blades are closed to form small air gaps. Exhaust gases flowing through these small openings are accelerated and hit the turbine wheel with a high level of energy in a radial direction, like on a small turbocharger. When the exhaust gas flow increases as a function of engine speed, the rotor blades progressively open increasing the turbocharger pressure accordingly.
The engine's Motronic brain" along with the electrically driven adjuster mechanism, allow the rotor blades to open and close within about 100 milliseconds. This technology renders the here-to-fore mandatory bypass valve, superfluous; allows for more efficient intercooling thus providing higher power and torque.
--PACE Collaborator Award, for Porsche Traction Management (PTM), with BorgWarner TorqTransfer Systems
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 system has unique performance requirements. The front and rear wheels turn at slightly different speeds. While providing some AWD benefits, the typical passive viscous coupling system provides limited compatibility with today's advanced electronic stability systems. Porsche was searching for a system that provided outstanding AWD dynamic improvements, but compatible with its advanced stability systems, while not negatively affecting performance, power use or energy consumption.
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