2009 BMW X5 xDrive35d - Car and Driver (blog)
With this diesel BMW X5 , it was the latter, since that’s the amount of time required to overcome the lag of the twin-turbo setup and for the big ute to go from a standstill to full-bore acceleration. But the turbo lag we mention might be more specifically described as big -turbo lag. Unlike the equal-size twin turbos on BMW’s gas six- and eight-cylinder engines, the inline-six diesel—a newly available engine option for 2009—uses two differently sized turbos in an attempt to minimize lag. The smaller turbo spools up first, when exhaust flow is minimal, and the larger one takes over once exhaust flow is sufficient to spin it. Once the turbos do their thing, the 3. 0-liter inline-six produces the same 265 hp and 425 lb-ft of torque... Compared with its gas-burning siblings, it’s closer to the time of the V-8 X5 xDrive48i (6. 1 seconds) than the inline-six X5 xDrive30i (7. 8). As you’d expect, fuel economy was improved. we got 20 mpg in the diesel versus 18 in the gas six-cylinder and 14 in the V-8. And unlike the last time we tested an oil-burning BMW, diesel fuel is cheaper than gas, at least for now. Source: www.caranddriver.com
