The - Porsche 911 Carrera 4 Brochure & Specs

Design icons. Engineering icons.
Yes, it sends shivers down our spine, too.
The engineering of the 911.
Two engines with direct fuel injec- combustion. For the driver, it
tion and power outputs of 345 hp means a distinct rise in power
and 385 hp. The optional Porsche and torque, and a distinct fall in
Doppelkupplung (PDK). Porsche fuel consumption and emissions.
Communication Management with It has been possible to reduce
touchscreen and, on request, a CO emissions by up to 15 % com-
2
voice control system. All progres- pared with the previous model.
sive technologies. It would be so
easy just to sum up the meaning Porsche Doppelkupplung (PDK,
of inner strength. We, however, p. 55), available as an option, is
prefer to get to the root of it. based on a development that
helped Porsche racing cars in the
All of the 911 Carrera and Targa 4 1980s to cause a sensation on
models have direct fuel injection racetracks around the world.
(DFI, p. 40). So how does this
compare with standard fuel PDK, with both a manual gearshift
injection? The fuel/air mixture and an automatic mode, has
is prepared entirely in the com- seven gears at its disposal. It is
bustion chamber after having like having two gearboxes in one
been metered and injected direct- and, as the name suggests, two
ly, with millisecond precision. clutches. Whenever a particular
gear is engaged, the next gear
From a technical perspective, is always preselected. Gearshifts
this means an accurate fuel/air therefore take place within
mixture and therefore optimum hundredths of a second, without
any interruption in the flow of
power. In comparison with con-
ventional manual transmission,
PDK achieves a considerably
faster rate of acceleration for the
same rate of fuel consumption.
When compared with the previous
automatic transmission, it pro-
vides significantly more driving
pleasure thanks to improved
responsiveness and thus greater
agility – with the same degree
of comfort at a reduced rate of
fuel consumption.
In combination with the Sport
Chrono Package Plus (p. 74), PDK
has a choice of two additional
functions: 'Launch Control' for
optimum acceleration from a
standing start, and a 'motorsport-
derived gearshift strategy'
bringing gearshift characteristics
straight from the racetrack.

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