- Porsche 911 Carrera Cabriolet, 2013
The sky's the limit now for driving fun with the new Porsche 911 Carrera Cabriolet which follows the Coupé introducing the superior attributes of the new generation 911 in the open-top sports car market segment. What the Coupé began with the new aluminium-steel body, the Cabriolet continues with the all-new, unique hood: intelligent lightweight design, even including the use of magnesium in the hood, ensures less weight and more sportiness, lower fuel consumption and greater comfort.
At the same time, the new convertible top technology enables the typical 911 roof line to be retained in full for the first time: even with the top closed, the Cabriolet reveals the unmistakable 911 silhouette - never before were Cabrio and Coupé so similar.
Each of the two new Cabriolets has the same engine as its Porsche 911 Carrera Coupé equivalent:
- Porsche 911 Carrera Cabriolet - 3.4-litre boxer engine with 350 hp (257 kW); rear-wheel drive, seven-speed manual transmission, optional seven-speed Porsche-Doppelkupplungsgetriebe (PDK); acceleration zero - 100 km/h in 5.0 seconds, with PDK in 4.8 seconds (4.6 seconds with Sport Chrono Package); top speed 286 km/h, with PDK 284 km/h; fuel consumption (NEDC) 9.2 l/100 km, CO2 217 g/km; with PDK 8.4 l/100 km CO2 198 g/km.
- Porsche 911 Carrera S Cabriolet - 3.8-litre boxer engine with 400 hp (294 kW); rear-wheel drive, seven-speed manual transmission, optional seven-speed Porsche-Doppelkupplungsgetriebe (PDK); acceleration zero - 100 km/h in 4.7 seconds, with PDK in 4.5 seconds (4.3 seconds with Sport Chrono Package); top speed 301 km/h, with PDK 299 km/h; fuel consumption (NEDC) 9.7 l/100 km, CO2 229 g/km; with PDK 8.9 l/100 km CO2 210 g/km.
The new Cabriolets are the 911s with emotional appeal. With the top down, they convey a unique abundance of intense driving impressions between outstanding performance and calm comfort. This is based on the light, stiff body in conjunction with the long wheelbase. Reduced weight and a longer wheelbase compared with the predecessor generation are complemented by the wider front track and larger wheels. In terms of its performance, the new 911 Cabrio raises the bar not by an inch but by a yard. This is down to a precisely synchronised package of new and enhanced systems. Electro-mechanical power steering and, in the case of the Carrera S, Porsche Torque Vectoring with differential lock are featured as standard - in conjunction with PDK even regulated. If so desired, the new 911 Carrera ups the ante in driving dynamics terms with options such as PDCC roll stabilisation.
With the open-top 911s as well, Porsche has managed to reverse the weight spiral and make the new Cabrio models significantly lighter than their predecessors, by up to 60 kilograms depending on equipment. As a result, for the same engine output, the new 911 Carrera generation combines enhanced performance with significantly lower fuel consumption - in short "Porsche Intelligent Performance".
Innovative lightweight roof with Coupé characteristics
The attention-getter with the Porsche 911 Carrera Cabriolet is the unique and all-new panel bow top. Thanks to the innovative technology, it has been possible for the first time to achieve the previously unachievable Coupé-like roof curvature of the closed fabric top, which offers aerodynamic advantages into the bargain. Moreover, the weight of the entire top remains on a par with the predecessor model, notwithstanding the increased length and signifi cantly enhanced comfort. The top can be opened and closed in approximately 13 seconds respectively - as in the case of the predecessor up to a speed of 50 km/h. It is operated by means of a button on the centre console or, from the outside, by means of the remote control.
Porsche has traditionally set the highest standards for the 911 top. That is why the new folding roof as well - as with every previous 911 - is a completely standalone development. The first distinctive feature is apparent at a glance: the fabric roof is tensioned in an elegant arc from the front window frame to the convertible top compartment with styling that is almost identical to that of the Coupé. No roof bows are discernible under the fabric nor are there any sections that interrupt the flowing design. Even the heatable rear window is virtually flush-fitting thanks to a new technique and is integrated with the cover with only the most discreet of seams.
Porsche new development: lightweight magnesium panel bow top
Critical to this shape, previously unachievable with fabric tops, is the innovative design as a panel bow top. This entails the entire fabric top - with the exception of the side panels - being tensioned over a rigid roof surface comprising four directly abutting individual segments. The four elements are the front roof frame, two panel bows and the rear window, the frame of which is made of magnesium, like the other segments. A large proportion of the frame guides are also made of this very light material; only the lateral guides, the drive levers and the rear tension bow are of aluminium. All frame components are kinematically linked so that only one hydraulic cylinder is required on each side to move the top. When it comes to closing the top, Porsche relies on a refinement of the tried and tested, centrallylocated, electric central locking mechanism, which is supported by lateral centering pins.
The panel bows and top are not locked together so that the four magnesium segments can dovetail one on top of the other when the top is opening whereas the fabric top is stowed using the tried and tested Z-folding technique. Thanks to this unique concept, the roof package comprising the fabric top, roof frame, panel bows and rear window requires only minimal stowage space of approximately 23 centimetres in height and around 55 centimetres in length when in the open position. Whereas the front section of the top remains visible when the top is open, the sickle-shaped flap covers the rear section - as before. Unlike the predecessor model, this significantly enlarged convertible top compartment lid now extends as far as the spoiler. This does away with the need for a body joint, with the rear looking even more elegant as a consequence.
With the top closed, the occupants enjoy a level of climate and noise comfort that comes closer to that of the Coupé than ever before. For example, the exterior material is underlaid over its entire area with an insulating mat. On the inside, the roof segments are covered with dimensionally stable roof linings that convey a comfortable interior feeling. The side panels as well are entirely clad with fabric so that with the hood closed, no technical components are visible any longer. The headroom as well is also broadly the same as inside the Coupé.
New: fully integrated electric wind deflector
A further innovation in the Porsche 911 Carrera Cabriolet is the built-in electric wind deflector. That makes fitting and removal a thing of the past. The new wind deflector is attached to a U-shaped tensioning bracket, which is fully integrated into the rear area when retracted, thereby not encroaching on the available space on the rear seats. At the push of a button, this bracket deploys within two seconds, in the process unrolling a mesh that is tensioned at right angles by a second movable deflection bracket behind the front seat armrests. The wind deflector can be deployed up to a speed of 120 km/h. The effect is equivalent to that in the predecessor model, ensuring that draughts are eliminated to a very large extent and that wind noise is minimal when the top is open. A deployed wind deflector is automatically retracted when the top is closed.
Latest generation adaptive rear spoiler
The Porsche 911 Carrera Cabriolet adopted the Coupé's variable spoiler concept albeit with modified parameters. With the top closed, the spoiler settings are the same as those of the Coupé, as the new top generates an almost identical airflow. Unlike when the top is open, in which case the spoiler assumes specifically developed positions. Depending on the vehicle configuration, the spoiler also extends to different heights and at different angles. Additionally, a flow element located on the leading edge of the spoiler is controlled by means of a special pivoting kinematic mechanism, ensuring optimal airflow over the spoiler blade. The spoiler is extended automatically at 120 km/h and retracted at 80 km/h but can also be extended below these speed limits at the push of a button.
cd = 0.30: Cabriolet with exemplary aerodynamics
The basic building blocks of the aerodynamic concept for the Porsche 911 Carrera Cabriolet are the streamlined surface of the body, the new top, the variable rear spoiler and the cooling system, which requires no large air intakes on the underside of the vehicle and therefore makes possible a largely smooth vehicle floor. Optimised air intake and air outlet cross sections also improve the guidance of the cooling air so that despite the cooling system that has been upgraded to cope with the enhanced engine and braking performance, the Porsche 911 Carrera Cabriolet's exemplary cd of 0.30 - with the top closed - remains unchanged.
Open-top lightweight 911 with new design language
The Porsche 911 Carrera Cabriolet's design echoes its predecessor's styling while developing an entirely new design language: thanks to a longer wheelbase combined with shorter overhangs, the vehicle makes a compact, made to measure impression. A vehicle height reduced by a further four millimetres (three millimetres in the case of the 911 Carrera S) compared with the 911 Carrera Coupé strikes a distinctly sporty tone in outward appearance. As a result of the 52 millimetre wider front track compared with the predecessor, the Porsche 911 Carrera Cabriolet has an even more solid stance on the road. The vehicle's 61 millimetre greater width at the front creates an even more harmonious vehicle silhouette. Larger air intakes underneath the redeveloped front lights emphasise the striking appearance. Together with the new Bi-Xenon headlights, they give the Porsche 911 Carrera Cabriolet a distinctive face.
The rear end echoes the sporty looks of the car's front end. It is characterised in particular by the new wider rear spoiler below the engine lid air intakes. The outer edge of the lid is part of the continuous design edge, which cleverly emphasises the vehicle's width. The compact dimensions of the redeveloped top system when stowed enabled the space above the engine to be used to best effect. The result: an elegantly flat and harmonious rear section.
Body: even stiffer and up to 60 kilograms lighter
The innovative lightweight body of the 911 Carrera family was redesigned from the ground up for Coupé and Cabriolet alike. That means that the open-top 911 and fixed-roof model share both the weight advantages of the aluminium-steel body and the significantly improved rigidity, complemented by local reinforcement elements. A continuous side impact support strut made of square ultra high-strength steel is fitted between the B-pillars. The side panel is also reinforced with ultra high-strength components, for example in the form of door sill reinforcements and reinforcement pits as well as stabilising components in the A and B-pillars. It was possible to improve dynamic torsional rigidity, which has a critical influence on comfort, by 18 per cent in the Porsche 911 Carrera Cabriolet models.
The underlying idea of the intelligent lightweight design concept is using the right material in the right place. Notwithstanding the Porsche 911 Carrera Cabriolet's increased dimensions, all the measures as a whole were able to deliver significant weight reductions compared with the predecessor models.
New roll-over protection system also increases rigidity
Less weight and greater rigidity compared with the predecessor generation means greater safety in addition to further improvements in driving dynamics and efficiency. Here too the open top 911 Carrera continues to be exemplary. For example, the automatic roll-over protection system was completely redesigned based on the tried and tested system. Whereas previously individual roll hoops were screwed onto an aluminium subframe, the new open top 911 features a compact, self-supporting gantry made of welded and high-strength aluminium profiles. This made it possible to reduce both space and weight requirements. Because of its high component rigidity, the supporting frame is also used to strengthen the body. It contributes to torsional rigidity by means of diagonal struts extending to the B-pillar and the convertible top stowage compartment.
In the event of an impending rollover, two newly developed sections located behind the rear seats are deployed by means of a pyrotechnically actuated spring mechanism. If the top is in the closed position, a carbide metal pin on each of the two roll hoops penetrates the safety glass of the rear window. Accidental triggering is practically impossible because sensing and actuation and constant monitoring is provided by the highly accurate airbag control device with built-in rollover sensor.
High degree of passenger protection for all types of accident
In the event of a crash in a longitudinal or lateral direction, the external forces are spread across longitudinal and lateral beams in the front and rear of the car in a predefined way. Ultra high-strength steels are used to ensure high rigidity, optimal deformability and energy absorption. They surround the passenger cell like a cage and by their extreme dimensio nal stability contribute critically to preserving the interior and thus to passenger protection. It goes without saying that as a result of the coordinated deformation behaviour of the aluminium luggage compartment lid and wings and of the aluminium-steel hinges, the intelligent lightweight design also complies with the ever more stringent global requirements as regards pedestrian protection.
The exemplary passenger protection in the Porsche 911 Carrera Cabriolet is complemented on the front seats by two-stage full-size airbags, head airbags built into the door panels (POSIP) and thorax side airbags as well as Isofix/top tether anchors on the rear seats. An Isofix system for attaching child seats on the front passenger seat is available as an option.
Porsche Intelligent Performance: more power, exemplary low fuel consumption
The production models of the open-top 911 traditionally have the same engines as the Coupés. This has not changed with the new generation. But in return the differences with the predecessor models have become all the greater: developed in accordance with the principle of Porsche Intelligent Performance, fuel consumption fell and output increased. Courtesy of enhancements within the engine itself, accompanied by the new functions thermal management, on-board electrical system recuperation and auto start/stop function, the new models are up to 15 per cent more economical and up to 15 hp more powerful. In short: even as a Cabriolet, the 911 Carrera remains, by an even greater margin, the benchmark for efficient performance among premium sports cars.
The previous engines and transmissions were an outstanding starting point for these efficiency-raising concepts. Porsche's first venture into downsizing within a model range was the flat-six engine in the 911 Carrera, reducing the piston stroke by four millimetres with the total displacement falling from 3.6 to 3.4 litres. The dimensions of the 3.8-litre six-cylinder engine in the Carrera S remained unchanged.
Both engines feature direct fuel injection, variable intake valve timing and valve lift switching (VarioCam Plus) and breathe through an especially flow-optimised and thus efficiency-enhanced intake manifold. The air filter as well has been optimised to offer less flow resistance. In the 3.8-litre six-cylinder engine of the 911 Carrera S, a controlled resonance flap further improves the charge level, thus providing high torque at low revs and an even torque curve.
The transmissions: seven speeds for dynamics and efficiency
The strategy for more efficient performance is continued with two transmissions combining uncompromising sportiness with fuel-economising, long gear ratios: the world's first sevengear manual transmission in a passenger vehicle and the Porsche Doppelkupplungsgetriebe (PDK), also with seven gears. Drivers of the manual transmission 911 Carrera as well can now sample the delights of the fuel consumption benefits for which the PDK is renowned: up to 19 per cent lower revs for the same speed and thus up to ten per cent lower fuel consumption at constant speed. A peculiarity of the new manual transmission is the shift gate lock to the seventh gear. It prevents the driver from unintentionally getting into the shift gate slot for the seventh gear during sporty driving, when he fast upchanges from fourth to fifth gear.
Intelligent efficiency: electrical system recuperation, thermal management, coasting
To increase efficiency, the boxer engines feature electrical system recuperation and mapcontrolled cooling water thermal management. In terms of electrical system recuperation, the battery is primarily charged during the braking or coasting phases. Reducing the generator charging current with a full battery in turn reduces the load on the combustion engine in acceleration phases as the combustion engine does not have to sacrifice so much power for charging the battery. Thanks to the intelligently managed cooling system shared by both engine and transmission, both of them reach their operating temperatures more quickly, meaning better combustion under partial load with less friction. The aforementioned measures alone reduce fuel consumption measured by the NEDC by 0.45 l/100 km. But it doesn't stop there: Porsche is introducing the auto start/stop function for all transmission variants in the new 911 Carrera generation - including for the manual transmission. The occasional short interruptions are having a big effect: the automatic engine cut-off when the vehicle is stationary is saving 0.6 litres of fuel for each 100 kilometres driven based on the NEDC.
The principle of only drawing on engine power when it is actually needed has resulted in a new sports car function in the new 911 Carrera with PDK transmission: coasting. In principle, coasting is nothing other than the car rolling along without power, and as a result you can achieve fuel consumption for a limited distance equivalent to when the engine is idling. In practice that means fuel savings of up to one litre per 100 kilometres with a forward-thinking driving style in everyday driving. Coasting is initiated by slowly taking one's foot off the accelerator or by manually changing up if the highest gear is already engaged. Coasting is ended by accelerating, braking or by manually changing gear. Coasting is better for fuel consumption because it enables the vehicle to harness its kinetic energy and convert it into distance covered.
Sound Symposer for even more intense acoustic driving fun
The new Porsche 911 Carrera generation offers the driver even sportier driving pleasure, sound-wise as well. And that not just with the top down: the Sound Symposer, featured as standard in both models, ensures an even meatier and sportier engine sound in the interior and is controlled by means of the Sport button, featured as standard.
The Sound Symposer is a passive system, creating not an artificial engine sound but directing the new boxer engines' distinctive sound into the vehicle interior at the push of a button. This is done by an acoustic channel picking up the intake vibrations between the throttle valve and air filter. The acoustic channel incorporates a membrane that transmits the vibrations into the interior in the area of the rear window shelf. A controllable valve located in front of the membrane enables the Sound Symposer to be activated or deactivated by means of the sport button, as the driver wishes.