BMW Develops Laser Headlights for i8 Concept, Future Models Most of the good ideas described above are employed here too, only the demands of a low-slung sports car preclude the placement of a giant battery pack under the floor. Here the batteries fill a central tunnel, as in the Chevy Volt. This pack is much smaller (7.2 kW-hr), and its lithium-ion chemistry is biased toward delivering power quickly. Its energy powers an electric motor located at the front of the car, while a three-cylinder turbocharged engine drives the rear wheels through an automatic transmission. There is no electrical connection between the front and rear axles, meaning they’re only connected through the road. The front axle gets 129 horsepower and 184 pound-feet of torque routed through a single-speed gear reduction transmission. It’s said to be capable of providing 20 miles of plug-in electric range. The rear gets a 3.0-liter DOHC BMW engine cut in half that’s balance-shafted to compensate for the first- and second-order moment imbalances. With a turbocharger, direct injection, Valvetronic and all ofBMW‘s other efficient/dynamic tricks, it kicks out 220 horsepower and 221 lb-ft. We were given no details about the transmission, except that it’s “an automatic in the BMW family,” which led most to expect the 6-speed from the Mini. But by the ZF 9-speed auto will also be “in the family,” and that would seem a better match for the seamless acceleration of the single-speed front transmission. The i8’s cooling system will be complex, as the battery pack, power electronics, electric motor, engine, and turbo intercooler all like to run at different temperatures. Considerable development work is ongoing in that area. Just two large doors pivot open about the A-pillars, providing access even in tight spaces for both front and rear passengers to climb in and out of the dramatic cockpit. Once inside, the combined 349 hp and 405 lb-ft are said to whisk the 3250-pound car to 62 mph in 4.6 seconds en route to a governed 155-mph top speed (at least a few times, until that battery pack depletes, leaving the front axle limp). Combined fuel economy is said to be as high as 80 mpg — not bad for a slinky, low-slung supercar.
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