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Jaguar XFR
The XFR receives a new, direct-injected 5.0L V-8 (also available for the 2010 XF). But the XFR's mill receives pressurization from a Roots-type, twin-intercooled supercharger. Despite a mighty output of 510 hp and 461 lb-ft of torque, the new engine comes sans weight or fuel mileage penalty -- its 15/23-mpg rating is the same as the outgoing supercharged 4.2L. Jaguar attributes this to a variety of new and altered components, including a direct-injection system, a variable-length intake manifold, and variable camshaft timing.
The new cam timing system relies on forces generated by the valves, rather than by oil pressure. The oil pump has been decreased in size and relocated as a result, reducing engine length by 0.94-in. These new technologies allow Jaguar to raise the compression of the engine to 9.5:1 (up from 9.1:1 on the 4.2L). Service intervals have been lengthened to 15,000 miles as well.