You might first want to see all the modifications of the 911 991

Porsche 911 991.2 RSR

Date of unveil by Porsche AG: November 16, 2016 (prototype May 12, 2016)
Premiere: 2017 January 28-29, Daytona 24h
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Engine: 4.0 B6 normally aspirated, up to 375 kW depending on the air restrictor
Gearbox: Sequential, 6-speed with 3-disc clutch, magnesium casing
Weight: 1243 kg/2740 lb by regulations

Two decades after the different 911 GT1 cars - 993 GT1 '96, 993 GT1 Street, 996 GT1 '97, 996 GT1 Street, 996 GT1 Evo '98 - the mid-engined 911 is back! In order to install a proper diffuser under the rear end of the 991, the engine had to make room for it and the engine/transmission unit was rotated 180 degrees. The 911 was Caymanished, so to speak. Now you probably remember when the Cayman came out in 2005, it was said to handle better than the 911. The wheelbase of the 991.2 RSR was extended to 2516 mm. In comparison Cayman GT4 has 2484 mm, 991.2 GT3 Cup has 2456 mm and 991.2 Carrera/Turbo have 2450 mm. So, the rear wheels were moved back 1.3-2.6"/32-66 mm depending on how you look. The extended rear diffuser, a top-suspended rear wing and the new side mirrors help to increase downforce with reduced drag. While the 911 GT1 cars were the ultimate mid-engined 911s with their turbocharged engines, the FIA rules restrict the engine power and there was no reason to equip the 991.2 RSR with a turbo engine. The normally aspirated 4-litre flat-6 was taken from the 991 GT3 R (used also in the 991 GT3 Cup 4.0).

The 991.2 RSR features a radar-supported Collision Avoid System which means now the faster LMP prototypes are detected early enough and misunderstandings can be avoided. For the driver safety, the seat is now closer to the center of the car and is rigidly mounted (a new FIA rule). The movable pedal box (as well as brakes), come from AP Racing.

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Mirror base contributes to the overall aerodynamics of the car© Porsche
Flat underbody extended to the sides © Porsche
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The brake discs are 390 mm front and 355 mm rear. And they are of steel, naturally. Racing is business and there's no room for solutions with flaws. With ceramic brakes you can pose to your neighbour.© Porsche
12.5" wide wheels with 300 mm tyres at the front and 13" wheels with 310 mm tyres at the back. © Porsche
The mirrors are electrically adjustable and have a memory function for each pilot© Porsche
Diffuser is the main reason the rear engine had to go, to make room for the rear end underbody aerodynamics © Porsche
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100% business © Porsche
At 80.6"/2048 mm, the body is 6.6"/168 mm wider than that of the 991.2 Turbo© Porsche
The top access panel for the engine mimics the rear window © Porsche
For better aerodynamics under the rear wing. it is hang from top© Porsche
The wheels are in the optimal size, which is 18", not 19, 20 or 21" which posers prefer© Porsche
Rear wing is mounted in "swan neck" style© Porsche
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Safecraft net release © Porsche
2016 Los Angeles Auto Show, Patrick Dempsey© Porsche
 © Porsche

2016 prototype

Prototype in May 2016 - note the regular 911 mirrors© Porsche

Between March and November 2016, the prototypes were tested for a total of around 22.000 miles/35.000 km which is more than with any previous Porsche GT racing car.

© James Herne /

Jan, 30 – 66th death anniversary of Ferdinand Porsche (1951)
Feb, 03 – 33rd birthday of the 962 (1984)
Mar, 05 – 14th birthday of the Carrera GT (2003)
Mar, 06 – 5th birthday of the Boxster 981 (2012)
Mar, 12 – 48th birthday of the 917 (1969)