The 991 introduced in 2012 is an entirely new platform, only the third since the original 911. Porsche revealed basic information on the new Carrera and Carrera S models on 23 August 2011.The Carrera is powered by a 355 PS (261 kW; 350 hp) 3.4-litre engine. The Carrera S features a 3.8-litre engine rated at 406 PS (299 kW; 400 hp). A Power Kit (option X51) is available for the Carrera S, increasing power output to 436 PS (321 kW; 430 hp). The new 991’s overall length grows by 56 mm (2.2 in) and wheelbase grows by 99 mm (3.9 in) (now 96.5 in.) Overhangs are trimmed and the rear axle moves rearward at roughly 76 mm (3 in) towards the engine (made possible by new 3-shaft transmissions whose output flanges are moved closer to the engine). There is a wider front track (51 mm (2 in) wider for the Carrera S). The design team for the 991 was headed by Michael Mauer.
At the front, the new 991 has wide-set headlights that are more three-dimensional. The front fender peaks are a bit more prominent, and wedgy directionals now appear to float above the intakes for the twin coolant radiators. The stretched rear 3/4 view has changed the most, with a slightly more voluminous form and thin taillights capped with the protruding lip of the bodywork. The biggest and main change in the interior is the center console, inspired by the Carrera GT and adopted by the Panamera.
The 991 is the first 911 to use a predominantly aluminium construction. This means that even though the car is larger than the outgoing model, it is still up to 50 kilograms (110 lb) lighter. The reduced weight and increased power means that both the Carrera and Carrera S are appreciably faster than the outgoing models. The 0–97 km/h (60 mph) acceleration time for the manual transmission cars are 4.6 seconds for the Carrera and 4.3 seconds for the Carrera S. When equipped with the PDK transmission, the two 991 models can accelerate from 0–97 km/h in 4.4 seconds and 4.1 seconds. With the optional sports chrono package, available for the cars with the PDK transmission, the 991 Carrera can accelerate from 0–97 km/h in as little as 4.2 seconds and the Carrera S can do the same in 3.9 seconds.
Apart from the reworked PDK transmission, the new 991 is also equipped with an industry-first 7-speed manual transmission. On vehicles produced in late 2012 (2013 model year) Rev Matching is available on the 7 speed manual transmission when equipped with the Sport Chrono package. Rev-Matching is a new feature with the manual transmission that blips the throttle during downshifts (if in Sport Plus mode). Also, the 7th gear cannot be engaged unless the car is already in 5th or 6th gear.
One of Porsche’s primary objectives with the new model was to improve fuel economy as well as increase performance. In order to meet these objectives, Porsche introduced a number of new technologies in the 911. One of the most controversial of these is the introduction of electro-mechanical power steering instead of the previous hydraulic steering. This steering helps reduce fuel consumption, but some enthusiasts feel that the precise steering feedback for which the 911 is famous is reduced with the new system. The cars also feature an engine stop/start system which turns the engine off at red lights, as well as a coasting system which allows the engine to idle while maintaining speed on downhill gradients on highways. This allows for up to 16% reduction in fuel consumption and emissions over the outgoing models.
The new cars also have a number of technologies aimed at improving handling. The cars include a torque vectoring system (standard on the Carrera S and optional on the Carrera) which brakes the inner wheel of the car when going into turns. This helps the car to turn in quicker and with more precision. The cars also feature hydraulic engine mounts (which help reduce the inertia of the engine when going into turns) as part of the optional sports chrono package. Active suspension management is standard on the Carrera S and optional on the Carrera. This helps improve ride quality on straights, while stiffening the suspension during aggressive driving. The new 991 is also equipped with a new feature called Porsche Dynamic Chassis Control (PDCC). Porsche claims that this new feature alone has shaved 4 seconds off the standard car’s lap time around the Nürburgring. PDCC helps the car corner flat and is said to improve high-speed directional stability and outright lateral body control, but according to several reviews, the car is more prone to understeer when equipped with this new technology.
In January 2013, Porsche introduced the all-wheel-drive variants of the Carrera models. The ‘4’ and ‘4S’ models are distinguishable by wider tyres, marginally wider rear body-work and a red-reflector strip that sits in between the tail-lights. In terms of technology, the 4 and 4S models are equipped with an all-new variable all-wheel-drive system that sends power to the front wheels only when needed, giving the driver a sense of being in a rear-wheel-drive 911….
