2015 PORSCHE 911 CARRERA 4S clutch

1
3
Drive 47
Efficiency-enhancing technologies.
Auto start /stop switches off the engine
when the driving speed falls below 4 mph
under moderate deceleration, such as
when you are approaching a red light. As
soon as you release the clutch or, with
PDK, depress the accelerator pedal, the
engine restarts – swiftly and smoothly.
In conjunction with Porsche Doppelkupplung
(PDK), a coasting function becomes
available where the situation allows.
The engine is decoupled from the
transmission to avoid deceleration
caused by engine braking. In this way,
optimum use is made of the vehicle’s
momentum, enabling it to coast for
longer distances.
Sports exhaust system.
It ’s a first for any Porsche turbocharged
boxer engines, and it ’s a technical
innovation. Available as an option for the
new 911, the sports exhaust system
features t wo cataly tic converters and a
rear silencer, which lead into two centrally
positioned tailpipes. For a look otherwise
more likely to be seen on the racetrack.
For impressive resonance and an intense
sports car sound – typical of the 911.
For 100 % Porsche. And for goose bumps
at the push of a but ton.
1 Spor ts exhaust system
2 Single-tube tailpipes of the 911 base models
3 Twin tailpipes of the 911 S models

Drive 49
7-speed manual transmission.
Pure, direct, precise. Short shift
movements and an optimum transition
from one gear to the next. The 7-speed
manual transmission combines a high
level of sport y performance with fast
gear changes. In conjunction with the
optional Sport Chrono Package, selecting
SPORT or SPORT PLUS mode activates
the dynamic
throttle-blip function, which
ensures the optimum engine speed for
every downshift, a more emotional
driving experience and an impressive
sound.
A gear indicator in the rev counter
reminds you which gear has been
selected. The upshift indicator in the
instrument cluster helps you actively to
conserve fuel.
Porsche Doppelkupplung (PDK).
The optimised 7-speed PDK, featuring
both a manual and an automatic mode, is
available as an option and offers extremely
fast gear changes with no interruption in
the flow of power. And that ’s with even
faster acceleration performance and a
further reduction in fuel consumption.
A first for the 911
models: in manual
mode, the shift direction simulates that
of racing cars and the 911
GT3 models –
to the rear to shift up, forwards to shift
down. For a racetrack driving experience
wherever you are. Gears one to six have a sports ratio, with
top speed being reached in sixth gear.
Seventh gear is ratioed primarily for fuel
economy.
PDK is essentially t wo gearboxes in one.
This double-clutch arrangement provides
an alternating, non-positive connection
bet ween the t wo half gearboxes and the
engine by means of t wo separate input
shafts. The flow of power from the
engine is transmit ted through one half
gearbox and one clutch at a time, while
the next gear is preselected in the
second half gearbox. During a gear
change, therefore, one clutch simply
opens and the other closes at the same
time, enabling gear changes to take
place within milliseconds.
Always a few milliseconds ahead of time.
Transmission.
1
7-speed manual transmission
2 Porsche Doppelkupplung (PDK)

Drive 51
The essential feature of all 911 all-wheel
drive models: enhanced Porsche Traction
Management (PTM).
Derived from the 911
 Turbo, the
electronically controlled and fully variable
multi-plate clutch distributes drive force
between the permanently driven rear
axle and the front axle even faster and
more precisely than ever before.
The driving state of the vehicle is
continuously monitored so that it is
possible to respond to different driving
situations. Sensors are used to collect a
range of data, including the rotational speed of all four wheels, the lateral and
longitudinal acceleration of the car and
the current steering angle.
If, for example, the rear wheels threaten
to spin under acceleration, a greater
proportion of drive force is transmit ted
to the front by a more powerful
engagement of the multi-plate clutch.
In this way, PTM, working in conjunction
with Porsche Stabilit y Management
(PSM), always ensures the appropriate
distribution of force necessary for
excellent driving performance and
particularly well-balanced handling at

the limit.
Drizzle, snow, leaves, sun.
Perfect weather for some sports action.
Porsche Traction Management (PTM).