In a 911, engine power is not the only priority. There is always the question of how this power can be effectively and consistently delivered to the road. One solution to this is all-wheel drive. An even better one is intelligent Porsche Traction Management (PTM), comprising permanent all-wheel drive with an electronically controlled multi-plate clutch, an automatic brake differential (ABD) and anti-slip regulation (ASR).

The force between the front and rear axle is distributed actively by an electronically controlled multi-plate clutch.

In comparison with a viscous multi-plate clutch, where clutch regulation is not initiated until there is a difference in speed between the front and rear axles, the electronically controlled multi-plate clutch responds much more rapidly. Through continuous monitoring of the driving conditions, the electronics are able to respond to a variety of situations. Sensors check, among other variables, the rotation speeds of all four wheels, the longitudinal and lateral acceleration of the vehicle, and the steering angle. By evaluating the sensor data, the system can quickly adjust the distribution of drive force to the front axle in order to achieve optimum balance. If the rear wheels threaten to spin under acceleration, a greater proportion of drive force is sent forwards by a more powerful engagement of the multi-plate clutch. At the same time, ASR prevents the rear wheels from spinning. When cornering, the front wheels only ever receive as much drive force as is necessary to prevent lateral instability. On uneven surfaces, the rear differential fitted as standard to all-wheel drive models, in combination with ABD, also improves traction.

In this way, PTM, in conjunction with Porsche Stability Management, ensures that the perfect distribution of drive is achieved every time.

PTM really comes into its own in the wet or in ice and snow. In these conditions, the car’s acceleration capability is simply breathtaking.

The result: a high level of safety and outstanding performance. Put to use in the most intelligent way.