BMW Vision EfficientDynamics concept

The speculation about the concept’s powertrain has gone in several directions, almost all of which were correct. The new concept is a plug-in hybrid with a three-cylinder turbo-diesel engine. Conceived with the idea of melding the performance of a M3 with exceptionally low fuel consumption, BMW claims a 0-62 mph time of 4.8 seconds while scoring 62.6 mpg (U.S.) on the E.U. combined test cycle.

There has been considerable speculation that future BMWs will go to smaller engines including a three-cylinder. The concept uses a 1.5-liter turbodiesel that is essentially half of the fabulous 3.0-liter found in the 335d. The triple is rated at a hefty 163 hp with peak torque of 214 lb-ft. The engine is paired with a six-speed DCT derived from the unit used in the M3 and Z4.

Adding fuel to recent reports that BMW would not continue developing the two-mode hybrid system that will debut soon in the X6, the concept uses a new strong hybrid system. The new system is a further development of the mild hybrid that is debuting in the ActiveHybrid 7. As in the 7, a more powerful 33-hp electric motor is sandwiched between the engine and transmission. A second 80-hp motor provides drive to the front axle. The total net output of the drive system is 356 hp and 590 lb-ft of torque.

Making use of electric motors requires some electrical energy system. Here BMW’s new concept has an arrangement similar to the Chevrolet Volt using a lithium–polymer battery pack running down the center tunnel of the car. Also similar to the Volt, the pack has a usable capacity of 8.6 kWh. However, the total capacity is just 10.8 kWh. BMW claims the pack used in the concept can use 80% of its capacity, considerably more than the 50% that the Volt uses. The upside is that the pack weighs just 187 pounds. When plugged into a standard European 220 V / 16 A outlet, the battery can be charged in just 2.5 hours.