Geneva 2010: Porsche 918 Spyder Hybrid Concept

01 March, 2010 05:57:00

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On the eve of the Geneva Motor Show, Porsche unveiled an ultra-efficient, low-emission, 918 Spyder Concept super sports car featuring hybrid and electric drive technology.

The 918 Spyder concept combines high-tech racing features with electric-mobility to offer a fascinating range of qualities. For example, it is planned to provide an emission level of just 70 grams of CO2 per kilometer on fuel consumption of only three liters/100 kilometers (equal to approximately 78 mpg U.S.), which is truly outstanding, even for an ultra-compact city car.

This car, however, is intended to offer the performance of a super sports car with acceleration from a standstill to 100 km/h in just under 3.2 seconds, top speed of 320 km/h (198 mph), and a lap time on the Nordschleife of Nirburgring in less than 7:30 minutes, faster than even the Porsche Carrera GT.

The 918 Spyder is one of three Porsche models with hybrid drive making their world debut at the 2010 Geneva Motor Show. This trio nÌƒ made up of PorscheiÌs new Cayenne S Hybrid SUV with parallel full-hybrid drive, the 911 GT3 R Hybrid race car with electric drive on the front axle and a flywheel mass battery, and the two-seater high-performance 918 Spyder mid-engined sports car with plug-in hybrid technology nÌƒ clearly demonstrates not only the great bandwidth of this new drive technology, but also the innovative power of Porsche as a genuine pioneer in hybrid drive.

The highly-innovative 918 Spyder concept car combines PorscheiÌs Intelligent Performance philosophy with the high-technology from motorsport, with classic but modern design to make a truly convincing statement.

This open two-seater is powered by a high-revving V8 developing more than 500 horsepower and a maximum engine speed of 9,200 rpm nÌƒ as well as electric motors on the front and rear axle with overall mechanical output of 218 horsepower (160 kW).

The V8 combustion engine is the next step in the evolution of the highly successful 3.4- liter power unit already featured in the RS Spyder racing car and positioned mid-ship, in front of the rear axle, giving the car excellent balance and the right set-up for supreme performance on the race track.

Power is transmitted to the wheels by a seven-speed Porsche-Doppelkupplungsgetriebe (PDK) transmission that feeds the power of the electric drive system to the rear axle. The front-wheel electric drive powers the wheels through a fixed transmission ratio.

The energy reservoir is a fluid-cooled lithium-ion battery positioned behind the passenger cell. The big advantage of a plug-in hybrid is that the battery can be charged on the regular electrical network. A further point is that the cariÌs kinetic energy is converted into electrical energy fed into the battery when applying the brakes, thus providing additional energy for fast and dynamic acceleration.

A button on the steering wheel allows the driver to choose among four different running modes: The E-Drive mode is for running the car under electric power alone, with a range of up to 25 km or 16 miles. In the Hybrid mode, the 918 Spyder uses both the electric motors and the combustion engine as a function of driving conditions and requirements, offering a range from particularly fuel-efficient all the way to extra-powerful.

The Sport Hybrid mode uses both drive systems, but with the focus on performance. Most of the drive power goes to the rear wheels, with Torque Vectoring serving to additionally improve the car iÌs driving dynamics.

In the Race Hybrid mode the drive systems are focused on pure performance with the highest standard of driving dynamics on the track, running at the limit to their power and dynamic output. With the battery sufficiently charged, a push-to-pass button feeds in additional electrical power (E-Boost), when overtaking or for even better performance.

With the hybrid drive system offering this wide range of individual modes and applications, the 918 Spyder is able either to achieve lap times comparable to those of a thoroughbred racing car, or the extremely low emissions and high fuel economy figures of a plug-in hybrid.

Check out the rest of our Geneva Motor Show coverage.

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