![]() ![]() Top gear in the PDK gearbox is much taller than in either the six-speed manual or the old five-speed Tiptronic for lower rpm on the highway. This is a double-clutch gearbox with seven speeds, and it can operate automatically, in a variety of modes, or manually via the shift lever or switches on the steering wheel. The bigger increases in the S engine come from larger valves, greater valve lift, and a two-stage intake manifold.īoth engines come with the current six-speed manual, but for an extra $4080, a new PDK transmission can be ordered, replacing the previous Tiptronic option. The 3800cc S engine goes from 355 to 385 ponies and from 295 to 310 pound-feet. There’s also an improved lubrication system that lowers the engine 0.4 inch, along with a more compact intake manifold, lighter tappets, and bigger bore and shorter stroke dimensions.Īs a result, horsepower in the 3614cc base engine jumps 20, to 345, and torque grows from 273 to 287 pound-feet. In addition, the construction of the water-cooled flat-six has changed to eliminate four major parts and improve cooling and stiffness. More air means more power, and higher compression aids both power and efficiency. ![]() This allows the compression ratio to be increased to 12.5:1 and for a little more air to be sucked into the engine with each intake stroke. By injecting the fuel directly into the cylinder at a pressure of up to 1740 psi, the intake charge is cooled very effectively when the fuel atomizes. ![]() The most important changes are in the engines: Both the standard 3.6-liter six and the 3.8-liter S version move from port to direct fuel injection. A perfect example is the 2009 version of the seminal 911 Carrera, known by anyone who matters as the 997. Despite Porsche’s grandiose maneuÂvering to take over Volkswagen, ÂEurope’s largest car company, the tiny Stuttgart automaker isn’t neglecting its core sports-car business. ![]()
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