Power comes from a modified 4.4-liter twin-turbo V8 engine with a 3-phase synchronous electric motor.

BMW has revealed their new 7-Series ActiveHybrid, ahead of its official unveiling at the Frankfurt Motor Show.

Scheduled to go on sale in the United States next spring, the new 7-Series Hybrid was designed to set "new standards for performance and efficiency in the premium luxury class."

Power comes from a modified version of BMW's 4.4-liter twin-turbo V8 engine which is equipped with a 3-phase synchronous electric motor. Thanks to this unique mix of performance and technology, the engine has a combined output of 455 hp and 516 lb-ft of torque. Backed up by an 8-speed automatic transmission, the 7-Series Hybrid accelerates from 0-60 mph in 4.8 seconds, while achieving a 15% improvement in fuel efficiency (compared to the 750i).

BMW also equips the 7-Series ActiveHybird with an automatic stop/start system. The system "avoids" engine idling when the car is stopped, but still allows operation of the vehicle's air conditioning and ventilation system via the lithium-ion battery. Other green technologies include Brake Energy Regeneration, two interconnected on-board power networks (a 12-volt network for the standard car battery and a 120-volt network for the lithium-ion battery), and a 400 watt-hour 35 cell lithium-ion battery which weighs 59.5 lb (27 kg) and measures 14.6 x 8.7 x 9.1 inches (37 x 22 x 23 centimeters).

Despite looking like a standard 7-Series, the ActiveHybrid is outfitted with a number of discrete styling tweaks. The exterior boasts aerodynamically-tuned ten-spoke 19-inch light-alloy Aero wheels as well as special badging on the trunk lid, C-pillars, and door cutouts. Inside, the car has various displays to inform occupants about the efficiency and current operating status of the hybrid components.

Check out press release for full details


Gallery: BMW 7-Series Active Hybrid Revealed