Porsche 911 RSR
The Porsche 911 RSR is a winner: In 2015, Porsche celebrated victories with the racer from Weissach in the world’s most important sports car championships. In both the Sports Car World Endurance Championship WEC and the North American IMSA SportsCar Championship, all three GT titles went to Porsche.
For the 2016 season, the 911 RSR, which is based on the seventh generation of the iconic 911 sports car, underwent modifications for the new season, particularly to the aerodynamics, to comply with the new regulations. The position of the rear wing was moved further to the back. The rear diffuser is now considerably larger. Moreover, the 911 RSR fielded in the Sports Car World Endurance Championship WEC and the IMSA SportsCar Championship received a modified front spoiler lip as well as wider side sills.
An enlarged escape hatch in the roof further improves the already high safety standards of the 470 hp winning racer from Weissach. The regulations also stipulate a new driver’s seat, which better supports the pilots and withstands a higher impact. New in the WEC is the safety net in front of the side window, which was introduced in the car in the USA in 2015.
Balanced weight distribution
The 911 RSR made its debut in 2013 as the successor to the successful 911 GT3 RSR. As with the production vehicle, the wheelbase grew by about ten centimetres. A new wishbone front suspension replaces the previously used McPherson struts. Another new development from Porsche Motorsport is the particularly lightweight racing gearbox. The six gears are selected via paddles on the steering wheel. The four-litre flat-six engine was taken from the predecessor and extensively optimised.
One of the priorities in the development of the 911 RSR was an evenly balanced weight distribution. The centre of gravity is also significantly lower than that of its predecessor. Carbon fibre played a crucial role in the new design. The front and rear mudguards, front and rear lids, doors, underbody, wheel arches, rear wing, dashboard and centre console are made of the very light and strong material. Moreover, all windows are made of particularly thin and light polycarbonate. Also contributing to the weight reduction is the lightweight lithium-ion battery known from the GT road-legal models.
Porsche works drivers involved in the development
Aside from the modified front spoiler lip, the widened sills and the larger rear diffuser, the look of the 911 RSR is dominated by the flared mudguards and the deep cooling air intakes at the front. The quick-change concept of the body parts was specially adapted for endurance racing, allowing for easier maintenance and shorter repair times. The front end, front lid and rear panel are fitted with quick release systems and can be replaced within seconds.
Low positioned static cornering lights provide improved vision and enhanced safety during night driving. The reflective labelling and anti-glare lighting of the control elements in the cockpit ensure optimal legibility in the dark. The arrangement of the switches on the new steering wheel was designed in co-operation with the Porsche works drivers. From the outset, all works drivers took part in the design of the 911 RSR, contributing their vast experience in GT racing. Single Point Refuelling ensures better safety in the pit lane: one hose is used for both refilling and venting, leaving only one refueller to work on the car.
Body: Self-supporting body in steel aluminium hybrid design (basis 911 Carrera 4, type 991); welded-in safety cage; removable roof hatch; body widened and aerodynamically optimised with carbon parts; front underbody aerodynamically optimised; PC side and rear windows; adjustable rear wing; steering wheel with shift paddles; six-point safety belt; racing bucket seat; FT3-safety tank with fast filling function; air jack; fire extinguisher.
Engine: Six-cylinder aluminium boxer engine in the rear; bore 102.7 mm; stroke 80.4 mm; capacity 3,996 cm³; power output approx. 345 KW (470 hp) with restrictor; four valve technology; water cooling; dry sump lubrication; multi-point fuel injection; weight optimised modular race exhaust system, twin-branched muffler with centred exhaust pipes.
Transmission: Porsche six-speed sequential dog-type gearbox with pneumatic shift mechanism; oil/water heat exchanger; hydraulic disengagement lever; single mass flywheel; three-plate carbon clutch.
Suspension: Front axle: Fully adjustable double wishbone; 4-way gas pressure shock absorber; double coil springs (main and helper); adjustable blade-type anti roll bar; power steering.
Rear axle: Multi-link axle with rigidly mounted cross member, adjustable ride height, camber, track; 4-way gas pressure shock absorber; double coil springs (main and helper); adjustable blade-type anti roll bar.
Brake system: Brake system with balance bar control and optimised cooling air ducting.
Front: Monobloc six-piston aluminium fixed callipers; steel brake discs internally-vented, 380 mm diameter; racing brake pads.
Rear: Monobloc four-piston aluminium fixed callipers; steel brake discs internally-vented, 355 mm diameter; racing brake pads.
Wheels and tyres: Front axle: 12.5J x 18, central bolt, Michelin racing 30/68-18. Rear axle: 14J x 18, central bolt; Michelin racing 31/71-18.
Electrics: Cosworth colour display with integrated data recording and gear shift point display; Cosworth electrical system control; lightweight lithium-ion battery 12 V, 18 Ah; 140 A alternator; air conditioning.
Weight: 1,245 kg (minimum weight in compliance with regulations).