The Porsche 918 Spyder is a mid-engined sports plug-in hybrid designed by Porsche and first shown as a concept at the 80th Geneva Motor Show in March 2010. The Spyder is powered by a 4.6 litre V8 engine, developing 608 horsepower, with two electric motors delivering an additional 279 horsepower for a combined output of 887 horsepower. It is the second plug-in hybrid car from Porsche, after the 2014 Porsche Panamera S E-Hybrid. The production version was unveiled at the September 2013 Frankfurt Motor Show.
The plug-in hybrid is a limited edition supercar, and Porsche plans to manufacture 918 units as a 2014 model year. Production began on September 18, 2013, with deliveries scheduled to begin in December 2013.The starting price is US$845,000.
Porsche unveiled the RSR racing variant of the 918 at the 2011 North American International Auto Show, which combines hybrid technology first used in the 997 GT3 R Hybrid, with styling from the 918 Spyder.
The 918 Spyder is a mid-engined two-seater sports car designed by Michael Mauer. It is powered by a 4.6 litre V8 engine. The engine is built on the same architecture as the one used in the RS Spyder Le Mans Prototype racing car without any engine belts.
The engine weighs 140 kg according to Porsche and it delivers 608 horsepower at 8,500 rpm and 528 N·m of maximum torque. This is supplemented by two electric motors delivering an additional 279 hp. One 154 hp electric motor drives the rear wheels in parallel with the engine and also serves as the main generator. This motor and engine deliver power to the rear axle via a 7-speed gearbox coupled to Porsche's own PDK double-clutch system. The front 125 hp electric motor directly drives the front axle; an electric clutch decouples the motor when not in use. The total system delivers 887 hp and 1,275 N·m of torque. As of October 2012 the engineering design is not finalized, but Porsche has given performance figures of 0–100 km/h in 2.8 seconds, 0-200 km/h in 7.9 seconds and a top speed of more than 340 kilometres per hour. The energy storage system is a 6.8 kW·h liquid-cooled lithium-ion battery positioned behind the passenger cell. In addition to plugging in to recharge, the batteries are also charged by regenerative braking and by excess output from the engine when the car is coasting. CO2 emissions are 79 g/km and fuel consumption is 3.3 L/100 km.
The 918 Spyder offers five different running modes: E-Drive allows the car to run under battery power alone, using the rear electric motor and front motor, giving a range of 20 miles; the car can reach 93 mph in this mode. Three hybrid modes use both the engine and electric motors to provide the desired levels of economy and performance. In Race mode a push-to-pass button initiates the Hot Lap setting, which delivers additional electrical power. The chassis is a carbon-fibre-reinforced plastic monocoque. Magnesium and aluminium are extensively used in the construction of the car which helps keep the 918 Spyder's weight down to 1,640 kilograms.
On July 28, 2010, after 2000 declarations of interest, the Supervisory Board of Dr. Ing. h.c. F. Porsche AG, Stuttgart, gave the green light for series development of the Porsche 918 Spyder.
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