2013 IAA: Porsche debuts the 911 (991) Turbo and Turbo S models [Live Photos]

Article by Christian A., on September 13, 2013

Porsche has presented the all-new 991 (911) Turbo and 991 (911) Turbo S models at the 2013 Frankfurt Motor Show (IAA). The two cars feature the turbocharged 3.8-liter six-cylinder engine with direct petrol injection, with an output of 520 hp in the Turbo and 560 hp in the Turbo S. Porsche remains to be the lone automaker to have two turbochargers with variable turbine geometry for a petrol engine.

The 911 Turbo and Turbo S models make use of the new thermal management system for the turbo engine and the PDK transmission, resulting to a fuel efficiency rating of only 9.7 l/100 km.

Porsche had developed a new all-wheel drive system (PTM) with electronically controlled and activated multi-plate coupling specifically for these new models. This system boasts of a new water cooling function. If the optional Sport Chrono Package is used, the 991 Turbo is able to do the 0-100 km/h (62 mph) sprint in 3.2 seconds, while the 991 Turbo S can do the same in 3.1 seconds.

The models can achieve a limited top speed of 318 km/h or 197.5 mph. The performance levels of the 991 (911) Turbo models are improved due to their use of rear axle steering. The system features two electro-mechanical actuators rather than the conventional control arms on the left and right of the rear axle. Depending on the car’s speed, the steering angle of the rear wheels may be varied by as much as 2.8 degrees.

When the vehicle is moving at speeds up to 50 km/h and the front wheels are turned, the system steers the rear wheels in the opposite direction. The 911 Turbo is able to perform this well during bends because of the virtual shortening of the wheelbase by 250 mm.

This system also makes maneuvering and parking simpler. When the car is driven at speeds above 80 km/h, the system steers the rear wheels parallel to the turned front wheels.

This corresponds to a virtual lengthening of the wheelbase by a considerable 500 mm, making the sports car very stable, particularly at high speeds. Another highlight for the 991 Turbo and Turbo S is that they offer active aerodynamics for the first time. The Porsche active aerodynamics (PAA) is comprised of a sturdy, retractable three-stage front spoiler, which has segments that could be pneumatically extended, and a deployable rear wing with three adjustable wing positions.

As a result, the aerodynamics of the 911 Turbo can be tuned to achieve either optimal efficiency (speed position) or top dynamic performance. All segments of the front spoiler are fully extended in the performance position, resulting to significant downforce at the front axle. When it comes to design, the two new models are wider than the 911 Carrera 4 models by 28 mm. They have an almost level surface, approximately the width of a hand, between the C-pillar and the outer edge of the car body.

Another feature that differentiates these models is the two-tone forged 20-inch wheels. The same wheels can be fitted on the 911 Turbo S but the difference is the presence of hub wheel locks. Furthermore, the 911 Turbo S offers new full-LED headlights that come with four-point daytime running lights and dynamic, camera-based main beam control – available as an option for the 911 Turbo.

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