Porsche Cayenne Turbo
With twin turbochargers boosting the output of its 4.5-liter V8, the Cayenne Turbo delivers 450 horsepower and 457 pound-feet of torque, power that propels it from a standing start to 62 mph (100 km/h) in a mere 5.6 seconds and to a top track speed of 165 mph (266 km/h).
But the Cayenne Turbo is just as capable off-pavement, thanks to its combination of Porsche Traction Management with standard air suspension that can provide nearly 11 inches of ground clearance for traversing rough terrain.
Like the Cayenne S, the Cayenne Turbo comes with such standard equipment as Porsche Stability Management; a six-speed Tiptronic S transmission; front, side and curtain airbags; full leather upholstery and automatic climate controls. The Cayenne Turbo adds such features as an aluminum-trimmed interior and the new Porsche Communications Management technology that includes a navigation system and Bose Cabin Surround Sound System.
The engine is designed to operate smoothly at an angle of 45 degrees off horizontal, thus providing optimum off-pavement abilities. This required modification of the oil circuit and crankcase-venting system, most notably separate oil re-flow ducts leading from the cylinder heads into the oil sump. Separation of the oil circuit from the vent ducts enables engine oil to flow quickly and directly back to the oil sump to maintain a sufficient oil supply at all times. On extreme gradients, an efficient supply of oil is also guaranteed by added oil extraction from the rear section of the oil sump, by the oil intake opening for the main oil pump being lowered right to the bottom point, and by a baffle wall in the oil sump.
The V8 shares much of its internal architecture with the water-cooled six-cylinder engine that was developed to power the Porsche Boxster. However, Porsche engineers developed specific components and dimensions for the Cayenne’s new V8. For example, while the 3.66-inch (93 mm) cylinder bore is the same as the Boxster’s, the V8 has a longer stroke of 3.27 inches (83 mm).
The V8 has a two-piece cylinder head similar to that developed for the powerful 911 Turbo, and the Cayenne engine’s cylinder head makes use of an aluminum/silicon alloy that can withstand very high temperatures.
As with all other Porsche models, the new V8 makes use of Porsche’s VarioCam technology. For the Cayenne’s V8, VarioCam can adjust the camshafts by as much as 25 degrees, ensuring outstanding torque characteristics as well as optimum fuel efficiency and lower emissions.
Source: Porsche press