Jaguar upgrades European XF diesel: 443 lb-ft and 35 MPG!

by: Sam Abuelsamid

Over in Europe, the Jaguar XF has been available with diesel power since its debut last year. However, as well regarded as the old 2.7-liter V6 oil burner was, its 207 horsepower couldn't run with the big dog twin-turbo 286 hp diesel six from BMW. So for the 2010 model year, Jaguar has developed a new dual turbo 3.0-liter that's available in 240 hp or 275 hp S trim. While 275 ponies might not seem all that special these days, the engine's 443 lb-ft of torque from as little as 1,600 rpm has what it takes to push the XF Diesel S to 60 mph in just 5.9 seconds en route to a top speed of 155 miles-per-hour. That's 0.3 seconds quicker than the normally aspirated 4.2-liter gasoline V8 that serves as the base powerplant here in the US.

Even more impressive is that the diesel offers this performance while achieving a combined fuel economy rating of 35 miles-per-gallon U.S. - a 12 percent improvement on the old 2.7. All of this is achieved through a 29,000 psi common-rail fuel system and a particulate filter. The forced-induction setup is particularly interesting: Most dual turbo configurations use a small responsive unit at low revs and a bigger unit at higher speeds. In this case, however, Jag's new XF uses a larger variable nozzle turbo at low speeds to reduce pumping losses and fuel consumption.