Porsche takes the plug-in hybrid concept and adds an F1-style steering-wheel button for a push-to-pass power boost (when that 500-plus horsepower V-8 alone isn’t quite enough) and a pair of torque-vectoring motors on the front axle to get enthusiasts onboard with going green. Porsche claims its plug-in hybrid 918 Spyder is quicker around the Nurburgring Nordschleife than its Carrera GT forebear–just under 7:30.
And for even more extreme duty, the endurance-racing-optimized GT3 R Hybrid mounts a twin-electric-motor drive unit at the front axle, with each motor capable of delivering 80 horsepower to its wheel, with more going to the outside wheel in a turn (torque vectoring). But to enable these motors to recover a lot of braking energy very quickly–way more than it would be possible to feed into a chemical battery–the recovered energy is used to spin up a flywheel. Yes, Porsche is planning to put the flywheel energy storage device on the track. You’ll recall that Chrysler tried to power a LeMans prototype racer with a flywheel and met with disastrous results, but that was a very large flywheel storing many orders of magnitude more energy storage capacity. This one is compact (it fits on the passenger side floor), low mass, and spins at 40,000 rpm. Its mass is easily contained within its ribbed aluminum housing. And if something does go awry, the flywheel stops, and all energy is dissipated–this isn’t always the case with electric batteries. The Porsche system provides 6-8 seconds of E-Boost at a time. Porsche plans to run the car at the 24-hours of Nurburgring on May 15-16. We’ll be cheering for the flywheel.
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