The 918 RSR looks to be another step forward toward making the 918 a production car reality. Its monocoque is built from carbon-reinforced plastic. The chassis is similar to that of the RS Spyder race car, and while not cheap or easy to manufacture, offers race car-level rigidity and lightness. The mid-mounted, direct-injection 3.4-liter V-8 is also derived directly from the RS Spyder race program. The 918 RSR version produces 563 horsepower at 10,300 rpm, roughly 50-horsepower more than the intake-restricted versions ever produced in the race car. The KERs system adds 204 horsepower with the push of a button through two 75 kiloWatt motors mounted in each front wheel. The electric motors not only provide up to eight seconds of additional thrust when the system is fully charged, but also act as generators under braking, providing the power to spin the flywheel energy storage device to a maximum of 36,000 rpm.
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