Genuine high performance calls for more than just a powerful engine. It also requires an effective means of delivering that power to the road. One solution to this is all-wheel drive. An even better one is the further-enhanced Porsche Traction Management (PTM), consisting of active all-wheel drive with electronically controlled multi-plate clutch and including an automatic brake differential (ABD) and anti-slip regulation (ASR).
PTM improves vehicle dynamics even further whilst ensuring that none of the customary traction and driving safety is lost. The result is an even more enjoyable sporty ride combined with exceptional stability.
Torque is distributed actively – and exceptionally quickly – via an electronically controlled multi-plate clutch. The advantage is that, through continuous monitoring of the driving conditions, a more immediate response to changing scenarios can be achieved. The status is monitored with the aid of on-board sensors. These are used to measure a range of values, including the rotational speed of all four wheels, the lateral and longitudinal acceleration of the car, and the current steering angle. The sensor data is analyzed in ‘real time’, enabling immediate adjustments in front-end drive torque as and when required. If, for example, the rear wheels lose traction under acceleration, a greater proportion of drive torque is automatically transmitted to the front axle. At the same time, ASR prevents the rear wheels from spinning by adapting the engine power. When cornering, the system controls drive to the front wheels in order to maintain optimum lateral grip. On variable-grip surfaces, traction is enhanced using the automatic brake differential (ABD). If a wheel threatens to spin, PTM brakes it via ABD and in doing so transfers more drive torque to the other wheel on the same axle.
Assisting PTM is Porsche Stability Management (PSM). Combined, these systems provide excellent torque distribution – and therefore outstanding performance – in all driving conditions.
The benefits of PTM are most evident in wet and snowy conditions. In these conditions, the 911 Turbo models offer breathtaking acceleration.
In short, PTM provides greater active safety and greater performance, combined with exemplary balance.