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The Porsche 918 Spyder is a mid-engined plug-in hybrid sports car designed by Porsche. The Spyder is powered by a naturally-aspirated 4.6 litre V8 engine, developing , with two electric motors delivering an additional for a combined output of . The 918 Spyder's 6.8 kWh lithium-ion battery pack delivers an all-electric range of under EPA's five-cycle tests.〔 The car has a top speed of around .〔 The 918 Spyder is a limited edition sports car, with 918 units manufactured and sold as a 2014 model year. Production began on September 18, 2013, with deliveries initially scheduled to begin in December 2013.〔 The starting price was . The 918 Spyder was the second plug-in hybrid car from Porsche, after the 2014 Panamera S E-Hybrid. The 918 Spyder was sold out in December 2014. The country with the most orders was the United States with 297 units.〔 Production ended in June 2015.〔 The 918 Spyder was first shown as a concept at the 80th Geneva Motor Show in March 2010.〔 The production version was unveiled at the September 2013 Frankfurt Motor Show.〔 Porsche also 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. ==Specifications== 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 135 kg according to Porsche and delivers at 8,500 rpm and of maximum torque.〔 This is supplemented by two electric motors delivering an additional . One 〔 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 〔 electric motor directly drives the front axle; an electric clutch decouples the motor when not in use.〔 The total system delivers and of torque.〔 By October 2012 the engineering design was not finalized,〔 but Porsche provided performance figures of 0– in 2.5 seconds, 0- in 7.2 seconds, in 19.9 seconds and a tested top speed of .〔 In Car and Driver's independent test of the Porsche 918, C/D achieved 0-60 mph in 2.2 seconds (making it the fastest car C/D has ever tested), 0-100 mph in 4.9 seconds, 0-180 mph in 17.5 seconds, and the 1/4 mile in 9.8 seconds. In Motor Trend's independent test of the Porsche 918, they also claimed it was the fastest car to 60 mph that they had ever tested. It stopped from 60-0 mph in 94 feet, and broke Motor Trend's figure 8 record at 22.2 seconds.〔 The energy storage system is a 312-cell, liquid-cooled 6.8 kW·h lithium-ion battery positioned behind the passenger cell. In addition to a plug-in charge port at the passenger-side B-pillar, 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 3.0 L/100 km (94 imperial mpg/78 us mpg) under the New European Driving Cycle (NEDC). The U.S. Environmental Protection Agency (EPA) under its five-cycle tests rated the 2015 model year Porsche 918 Spyder energy consumption in all-electric mode at 50 kWh per 100 miles, which translates into a combined city/highway fuel economy of 67 miles per gallon gasoline equivalent (MPG-e) (3.5 L/100 km; 80 mpg-imp gasoline equivalent).〔 When powered only by the gasoline engine, EPA's official combined city/highway fuel economy is . The 4.6 litre V-8 petrol engine can recharge an empty battery on about two litres of fuel. The supplied Porsche Universal Charger requires seven hours to charge the battery on a typical 110 volt household AC socket or two hours on a dedicated Charging Dock installed with a 240 volt industrial supply. An optional DC Speed Charging Station can restore the battery to full capacity in 25 minutes. 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 for the concept model.〔 The official U.S. EPA all-electric range is . The total range with a full tank of gasoline and a fully charged battery is according to EPA tests.〔 Under the E-Drive mode the car can reach .〔 Two hybrid modes (Hybrid, and Race) 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. The 918 has electromechanical brakes. 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 918 Spyder. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Porsche 918」の詳細全文を読む スポンサード リンク
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