Porsche 991/2 was developed under the leadership of Thomas Krickelberg and his engineering team at Weissach. They started their work on the Porsche 991/2 at the end of 2012 when the Porsche marketing department was unveiling the Porsche 991/1.
One of the major problems faced by Porsche was the ever-strict emission regulations and demand for more fuel-efficient automobiles. The key markets like the US, China, and Europe now had strict regulations regarding carbon dioxide emissions and fuel consumption. It was only a matter of time to experience even stricter regulations.
Porsche engineers soon realized that the most logical approach was to get rid of naturally aspirated engines and replacing those with turbocharged lower displacement engines. Porsche enthusiasts and traditionalists considered this as blasphemous.
However, this approach also meant that now the carbon dioxide emissions were lower and the fuel consumption was lower.
Porsche unveiled the Porsche 991/2 at the 2015 Frankfurt Motor Show.
With the introduction of the Porsche 930 Turbo back in 1975, Porsche quickly established itself as on of the pioneers in turbocharging. Porsche 930 Turbo packed a maximum power output of 260hp. The fuel consumption was averaged at 13mpg according to the modern German fuel economy testes.
Porsche 991 Turbo developed 520hp, double the amount of maximum power output of Porsche 930 Turbo. It also has a combined fuel consumption of 20 mpg, 25 mpg on the highway, and 17 mpg in the city.
The advantages of turbocharging were clear as daylight and Porsche soon decided to turbocharge engines instead of increasing the engine displacement. The engines were all-new and carried over only a handful of parts from the previous engines. The turbocharging system included a conventional turbocharger with a wastegate.
RPM redlined at 7500rpm when compared to the 7800rpm of the previous naturally aspirated engines.
The base Porsche Carrera 991/1 variant came with a 3.4-liter engine delivering a maximum power output of 350hp. The base Porsche Carrera 991/2 is equipped with a 3.0-liter twin-turbocharged and inter-cooled engine. The maximum power output is rated at 360hp. According to the Porsche insider’s Porsche, engineers could have easily tuned the engine further to deliver 400hp. Thomas Krickelberg stated that they wanted to keep the power output at a sensible level for the base variant.
A normally aspirated 3.8-liter in Porsche 991/1 S engine delivered 400hp. The Porsche 991/2 Carrera is equipped with a twin-turbocharged 3.0-liter engine, delivering 370hp.
The Porsche 991 Carrera S variant also had a large turbocharger unit and the bore and stroke measured 99×74 mm, effectively limiting the displacement to 3.0-liter. This also helps Porsche and its customers to avoid higher taxes in several key markets. Power output was measured at 420hp.
However, the official acceleration figures for the Porsche 991 Carrera and Porsche 991 Carrera S dropped by 0.1 seconds each, but fuel efficiency improved a lot.
Official German Fuel Economy tests show that the average fuel consumption of Porsche 991/1 Carrera was measured at 25.4 mpg while Pothe all-new Porsche 991 Carrera achieved 29.7mpg. New Porsche 991 Carrera S achieved 28.4mpg when compared to the 23.7 mpg achieved by Porsche 991/1 Carrera S.
Porsche 991/1 Turbo variants had air inlets to provide efficient engine cooling, but the Porsche 991/2 Carrera and Porsche 991 Carrera S doesn’t feature many stylist changes when compared to their predecessors. Porsche 991 Carrera and Porsche 991 Carrera S both featured subtle air intakes and vents for the turbocharged and inter-cooled engine. Porsche design team decided to keep things civilized for the Porsche 991/2 Carrera and Porsche 991/2 Carrera S. The main reason for this was to retain the iconic turbo treatment for the Porsche 991/2 Turbo and Porsche 991/2 Turbo S variants.
Porsche 991/2 Turbo is equipped with a twin-turbocharged twin-intercooled 3.8-liter engine, packing 540hp.
Porsche engineers tested the Porsche 991 Carrera, Porsche 991 Carrera S, and Porsche 991/2 Turbo variants on the Nardo test track in Italy, and the Nurburgring Nordschleife race track.
It is said that the test mules completed nearly 180,000 miles on public roads, Nardo, Nurburgring, and on a chassis dyno to improve their reliability.
Porsche 991/2 model lineup was unveiled at the 2015 Frankfurt Auto Show for the 2016 model year and the success of the cars convinced Porsche to use turbocharging technology to power up the Type 718 Porsche Cayman and Boxter variants. The inline-four engines were turbocharged to deliver more power with improved fuel economy and emissions.