While BMW spent last year adding upgraded engines to its lineup, the X5 sat untouched, forced to enjoy only the 3.0-liter diesel found in the xDrive35d. A potent mill, yes, but the other Bimmers received a more efficient, single turbo inline-six; if they didn't, more power came to their twin-turbo setup. A 400-hp twin-turbo V-8 headlined the X6, while the M versions of it and the X5 boasted a silly 555-hp. Now, the standard X5 gets its turn: Along with an exterior refresh, the 2011 BMW X5 receives two new powertrains.
At the top of the hierarchy is the X5 xDrive50i, which features BMW's all-aluminum, twin-turbo V-8. With direct injection, variable valve timing, and its "reverse flow" setup (the turbochargers rest in the valley between the cylinders), the engine makes 400-hp and 450 lb-ft of torque, the latter from 1750 rpm to 4500 rpm. Like the X6, BMW claims acceleration to 60 mph in the X5 xDrive50i takes 5.3 seconds. Yet the X5 undercuts the current Sports Activity Coupe by $8800 by starting at $59,275.
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