As expected, Porsche unveiled today the 918 RSR, a new two-seater mid-engine coupe which uses the technology fitted in the 911 GT3 R hybrid and the design of the 918 Spyder. The new car shows muscular wheel arches, dynamic air intakes and a pulpit-like cockpit as well as a new "liquid metal chrome blue" colour created in order to underscore the sculptured curves of the forms.
The car is powered by the same V8 engine found in the 918 Spyder Concept, capable to deliver 563 hp at 10,300/rpm in the 918 RSR.
Furthermore, the V8 engine is helped by the electric motors on the two front wheels each contribute 75 kW, which means a total of 150 kW. The total output delivered by the car is 767 hp.
This additional power, which is generated during braking, is stored in an optimised flywheel accumulator. The engine is mated to a six-speed constant-mesh transmission with longitudinally mounted shafts and straight-toothed spur gears, operated via two shift paddles behind the racing steering wheel.
Inside, we find an unadorned racing atmosphere with a brown leather sport bucket, a new leather wrapped steering wheel as well as a recuperation display on the steering column in front of the display screen which supplies the pilot with information.
As you can see from the photos, the car doesn’t have a second seat, as its place is taken by the flywheel accumulator. For those who don’t know, the flywheel accumulator is an electric motor whose rotor rotates at up to 36,000 rpm to store rotation energy.
At the push of a button, the pilot is able to call up the energy stored in the charged flywheel accumulator and use it during acceleration or overtaking manoeuvres.
The interior of the Porsche 918 RSR is dominated by a plain racing atmosphere, which is unlike that of the 918 Spyder concept car. The bucket seat has a figure-hugging feature and is covered in brown leather, which is reminiscent of the history of a gentleman driver.
Giving the driver the necessary information is the racing steering wheel with its gear that flashes as well as the recuperation display found on the steering column located in the front of its display screen. The 918 Spyder concept car has an ergonomic and advanced center console that offers a touch-sensitive user interface. For the 918 RSR however, the cockpit is instead split with a minimalistic console with rocker switches.
In addition, rather than have a second seat, to the right of the console is the flywheel accumulator. This is an electric motor that has a rotor that can rotate up to 36,000 rpm in order to be able to store any rotation energy. During the braking process, the two electric motors located on the front axle reverse their action and thus start operating as a generator in order for the charging to start.
By simply pushing a button, the driver can get the energy that has been stored in the charged flywheel accumulator and can be utilized when overtaking or accelerating. Since the flywheel brakes electromagnetically, it can give an extra 2 x 75 kW, or a total 150 kW, using kinetic energy from the two electric motors located on its front axle.
When the system has been fully charged, the extra amount of power is present for an estimated 8 seconds. In the 911 GT3 R Hybrid, this extra power can be applied as a consumption aid based on the racing situation. Examples include delay in pit stops or a reduction in the volume of the fuel tank and therefore the vehicle’s overall weight.