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.
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