Porsche 991 had many changes when compared to the previous iteration of the Porsche 911.
Porsche 991 was a fresh start and even the engines used in the model lineup were almost brand new. Only a few mechanical components of the previous generation models were carried over other than the engine used to power the Porsche 991 Carrera.
The Porsche 991 was also the first Porsche 911 variant to come with electronic steering instead of the previous hydraulic units. This was a controversial decision as many felt that the electronic steering wasn’t delicate enough. Porsche engineers spent weeks in test mules to test the electric system and to identify what they didn’t like and what they liked about the new change. Eventually, they came up with their own parameters and systems.
This also allowed the engineers to add the rear-wheel steering system derived from the Porsche 918 Spyder to higher-end Porsche 991 variants.
When developing the next iteration of the Porsche 911 series, the Porsche engineers wanted to make the new generation faster, better handling, and better in every imaginable way.
To get more power and torque outputs, a large capacity engine is necessary. But when the engine is larger it becomes heavier. Since the Porsche 991 is a performance-oriented sports car, it has to become lightweight as as it can.
Porsche engineers consider developing an all-aluminum car, but it was more costly to produce. So, they decided to build a multi-metal concept bodywork. This multi-metal bodywork featured body panels made out of aluminum alloy. The structure was made out of high-strength steel to make it more rigid and stiff. Die-cast magnesium was used to assemble the body panels to the structure.
The Porsche 991 design was completely paying homage to the previous Porsche 911 variants but was adopted to suit the longer wheelbase as well as to provide as optimal weight distribution as possible. Engineers moved the base of the windshield forward nearly three inches and with this, they were able to shift the weight point a little further back.
When comparing the Porsche 911 series, since the introduction of the first prototype Porsche 901 in 1963, Porsche engineers did many modifications and upgrades to improve the ride quality, its overall handling, and performance.
Porsche engineers increased the wheelbase and front-wheel track of the Porsche 911 for the 1969 model year. The wheelbase was lengthened 2.24 inches and the front wheel track was increased 3.66 inches when compared to the original car released in 1965.
In 1998, the Porsche 996 series was unveiled with a 3.19-inch longer wheelbase, and the front wheel track was now 3.66 inches wider.
When the Porsche 991 series was unveiled in 2012, it featured a 3.98-inch longer wheelbase and 3.03-inch wider front wheel track.
According to the Porsche engineers, the wider front track allows them to use a slightly thinner stabilizer to make it less stiff and this eventually results in reduced understeering.
Porsche Dynamic Chassis Control (PDCC) system was first introduced for the Porsche Cayenne SUV and Porsche Panamera sedan. What PDCC does is keeping the tires perpendicular to the road in all situations to ensure steering precision and optimal transfer of acceleration. This system is completely capable of eliminating body roll.
The 20-inch alloy wheels were now standard on the Porsche 991 Carrera S while the Porsche 991 Carrera was equipped with 19-inch alloy wheels.
The previous Porsche 911 iteration, the Porsche 997 was criticized by the customers, engineers, and many others for its inability to block tire noise, wind noise, and road noise.
To offer a more refined ride quality for the Porsche 991 series, better sound insulation techniques were used when the car was designed. This also meant that the customers are in need of something extra in terms of the noise department. To address this, a new Sound Symposer was developed.
The Sound Symposer system was jointly developed by Porsche and Mann and Hummel Group. This is a multi-chamber module transferring acoustic pulses from the air intake through a funnel-like opening that housed a tuned membrane.
This system, therefore, allows the driver to hear the intake and engine noises while someone outside could hear the exhaust noise.
The Porsche 991 featured an all-new interior and many other improvements and upgrades. The seats were all new and the center console was influenced by the Porsche Carrera GT. A seven-inch touch screen was added as standard with satellite navigation, entertainment, and a car phone system.
Seven-speed manual gearbox or a Porsche Dopplekupplungstreibe (PDK) were available to choose from.
The Porsche 991 Carrera base variant was now equipped with a new 3.4-liter inline-six engine derived from the Porsche 997’s 3.6-liter inline-six unit but with reduced piston stroke. Power delivery was measured at 350hp. This engine also resulted in better fuel economy.
The Porsche 991 Carrera S variant was equipped with an improved 3.8-liter S engine. Power delivery was measured at 400hp. Fuel economy was also improved significantly.
Porsche 991 Carrera S equipped with a PDK transmission unit could reach 0-60mph in 3.9 seconds.
Porsche’s engines also come with automatically stopping and starting the system to reduce fuel consumption.
More than twenty variants of the Porsche 991 were unveiled during its lifespan.
The final evolution of the Porsche 991 series was the Porsche 911 R variant. This car packed 500hp. This car was a modern-day interpretation of the original Porsche 911 R released in 1968.
Porsche 911 R had two red stripes similar to the ones featured in the original Porsche 911 R cars, which went on to accomplish a new World record run of 20,000 km around the Monza banked track in over 96 hours.
According to the Porsche engineers, they started working on the next generation of the Porsche 911 even before the Porsche 991 reached the market.