BMW has released full details on the xDrive-equipped versions of the 2-Series Active Tourer, the 220d xDrive AT and 225i xDrive AT.
This is the first application of xDrive on a front-wheel drive concept with transversally installed engines, with the BMW 225i xDrive Active Tourer and 220d xDrive Active Tourer benefitting from improved traction and stability.
Available only for the 2-Series Active Tourer’s top-of-the-range power units, the intelligent four-wheel drive system is offered in combination with the 8-speed Steptronic automatic transmission. BMW says the four-wheel drive system adds around 61 kg (134.5 lbs) to the models’ curb weight, which has a minimum impact on fuel efficiency.
Depending on the size of the tires, the BMW 225i xDrive Active Tourer has a combined fuel consumption as low as 6.4 l/100 km (36.7 mpg US), while CO2 emissions are rated at 148 g/km. The BMW 220d xDrive Active Tourer is obviously more economical, averaging as low as 4.6 l/100km (51.1 mpg US) and 122 g/km of CO2.
The xDrive system transfers power from the front drive to the rear axle by means of an angular gear (Power Take-Off) on the front differential and a two-part cardan shaft. The central component of the four-wheel drive system is an electro-hydraulically controlled multiple-disk clutch (Hang-On) inside the rear axle drive, which allows infinitely variable distribution of torque to the front and rear wheels.
When needed, the multiple-disk clutch (Hang-On) can direct up to 100 percent of torque to the rear wheels – for example when the front wheels are standing on ice. Under normal driving conditions when AWD is not required, the BMW 2 Series Active Tourer works in front-wheel drive mode.