Porsche 918 Spyder Hybrid
The all-wheel drive concept of the 918 combines a gasoline engine with an electric motor on the rear axle and a second electric motor on the front axle. The powertrain is based on knowledge gained by Porsche during races with the 911 GT3 R Hybrid.
With a combined output of over 880 PS (868 hp), the 918 Spyder averages 3 liters/100 km (78.4 mpg) – keep in mind, that’s with the use of the electric motor. It has an unladen weight of approximately 1,640 kg (3,615 lbs) when fitted with the optional “Weissach” package. This is possible thanks to the use of lightweight materials such as CFRP (carbon fiber reinforced polymer). Also, drivetrain components weighing over 50 kg (110 lbs) are located as low and as centrally as possible within the vehicle.
The 918 Spyder has a multi-link chassis complemented by additional systems such as the PASM adaptive shock-absorber system and rear-axle steering. At low speeds, the system steers the rear wheels in a direction opposite to that of the front wheels, helping cornering and reducing the turning circle. At higher speeds, the system steers the rear wheels in the same direction as the front wheels, improving the stability of the rear end when changing lanes quickly and, consequently, handling.
To operate the three power units, there are five modes that can be activated from the steering wheel. The “E-Power” mode is the default operating mode providing a range of over 30 km (18.6 miles) on purely electric power. Even in battery mode alone, 0-100 km/h (62mph) is covered in under 7 seconds and top speed is 150 km/h (93.2 mph). When the battery level drops, the system automatically switches to hybrid mode.
In “Hybrid” mode, the electric motors and combustion engine work alternately with a focus on maximum efficiency and minimum fuel consumption. In “Sport Hybrid” mode, the combustion engine operates continuously and provides the main propulsive force. It is also aided by the electric motors in the form of electric boosting.
There’s also a “Race Hybrid” mode used for maximum performance and a very sporty driving style. The emphasis is put on the combustion engine, with support from electric motors in the form of boosting. The 7-speed PDK transmission helps with a set up for sportier driving. Drivers can also use the “Hot Lap” button that releases the final reserves of the 918 Spyder. Similar to a qualification mode, it utilizes all of the available energy in the battery.
(story from Carscoops)