2009 Porsche 911 Carrera 4 and 4S

The second generation all-wheel-drive 911 is here, featuring a raft of new technologies on its key components: power unit, gearbox, and power distribution system. First on the list is a pair of brand-new engines retooled from the ground up. The standard C4 still uses a 3.6-liter flat six and the C4S a 3.8, but thanks to new direct fuel injection each offers improved power, torque, and fuel economy. The 3.6 is up 20 hp over its predecessor with a maximum output of 345, while the 3.8 in the S iteration has been improved by 30 hp, peaking at 385 hp.

As with the standard rear-drive Carrera, the all-wheel models both feature the new optional twin-clutch PDK transmission with seven forward gears. Even in this, its first generation, the new twin-clutch gearbox is an incredible piece of work with effortless, lightning-fast actuation in either direction. Gear changes can be actuated by either pulling or pushing on the central gear lever, or by pushing or pulling paddles mounted on either side of the steering wheel. Alternatively, the driver can enjoy an amazingly smooth, fully automatic "drive" mode, if he or she decides a leisurely cruise through town is in order. PDK also features a built-in "launch" mode that can shave up to four-tenths of a second off of the 0-to-100 km/h (0-to-62 mph) elapsed time.

The Carrera 4 and 4S traction control system, Porsche Traction Management, is derived from the current-generation 911 Turbo. It actively analyzes driving conditions and inputs and adjusts the system accordingly, sending torque to either the front or the rear wheels, depending on where it is best applied. The variable split can direct up to 100 percent of the current output to the front or rear axle, and naturally, any combination of percentages in between, depending on the situation.Both the 911 Carrera 4 and Carrera 4S are available in either coupe or cabriolet configurations. Look for a complete review and driving impression in an upcoming issue of european car.