clutch PORSCHE 911 2014 6.G Information Manual

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A widely held belief about motorsport is
that power is the only thing that mat ters.
From experience, we know bet ter. Extra
horsepower alone has never been enough
to win a single race. Much more important
to us are ideas – ideas that inspire more
intelligent vehicle concepts and more
efficient drive systems. The same applies
on the road. It ’s about get ting the most
out of what you’ve got.
Auto start/stop function.
The auto start/stop function is standard
in the 911 Carrera models.
In cars with the manual gearbox, the
engine switches off automatically
when, for example, you stop at traffic
lights, select neutral and release
the clutch pedal. In cars with Porsche
Doppel kupplung (PDK), the engine
switches off whenever you stop and
leave your foot on the brake pedal.
All audio and communication systems
remain switched on and the climate con -
trol continues to maintain your selected
temperature. The only differences you
will notice are the silence at the rear and
the fuel saving. As soon as you operate
the clutch or release the brake, the
engine will restart swiftly and smoothly. The auto start/stop function may remain
inactive under particular circumstances,
for example: extreme outside tempera
-
tures, when the SPORT but ton is selected
or if bat tery charge is low. It is also pos -
sible to deactivate the function manually
using a separate but ton on the centre
console.
Thermal management.
The thermal management system
regulates the temperature in the engine
and gearbox through the intelligent
manipulation of heat flow.
In this way, the engine and gearbox reach
their optimum operating temperature
sooner. As a result, fuel consumption is
reduced through increased combustion
efficiency and lubrication performance.
Electrical system recuperation.
The 911 Carrera models are also
equipped as standard with fuel-saving
electrical system recuperation tech -
nology. The vehicle bat tery is recharged
by the alternator predominantly under
braking. Under acceleration, on the other
hand, the power draw of the alternator
is limited to increase the engine output
available for driving. The electrical
systems are supplied by the electrical
energy stored during the recharging
process.
T emperament | Engine
Not as thirsty as you might think.

Efficiency-enhancing measures.
For fuel consumption, CO2 emissions and efficiency class, please refer to pages 141/143.

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7R
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Porsche Doppelkupplung (PDK).
Available as an option for all
911
Carrera models is 7-speed PDK,
featuring manual and automatic modes.
It facilitates extremely fast gear changes
with no interruption in the flow of power,
whilst at the same time improving
acceleration and fuel efficiency. The first six gears are particularly
sport y, with top speed being reached

in 6th gear. 7th gear has a long
ratio and reduces the revs – for lower
consumption.
PDK is essentially t wo gearboxes in one
and thus requires t wo clutches. This
double-clutch arrangement provides an
Porsche Doppelkupplung (PDK)
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.
The effect is instant. Driving feels even
sportier and more dynamic, and agility

is increased. Depending on the gearshift
programme (SPORT button activated
T emperament | Transmission
or deactivated), the gear change is opti -
mised for comfort or for sport y driving.
With the optional Sport Chrono Package,
PDK is enhanced by the ‘Launch Control’
and ‘motorsport-derived gearshift
strategy’ functions (pages 65– 67).
Coasting.
The ‘coasting’ function available with
Porsche Doppelkupplung (PDK) enables
you to save even more fuel where the
situation allows. The engine is decoupled
from the transmission to prevent
deceleration caused by engine braking.
In this way, optimum use is made of the
vehicle’s momentum, allowing it to coast
for longer distances.
For example, you may want to slow down
from 100 to 80 km/ h in anticipation
of the change of speed limit ahead. As
soon as you release the accelerator
pedal, PDK deselects the current gear automatically and you begin to coast
in neutral until you have reached your
desired speed. The moment you engage
the accelerator or brake pedal, PDK
selects the appropriate gear smoothly
and seamlessly within a fraction of a
second.
In short, driving in coasting mode makes
a real impact on fuel consumption without
any need for compromise on comfort or
sporty performance.
Another way to reduce fuel consumption is
to utilise the coasting function on downhill
gradients that are gentle enough for you
to maintain a constant speed. Efficient on
long journeys, such as on the motorway,
PDK remains ready to respond as swiftly
and precisely as you would expect.
For fuel consumption, CO
2 emissions and efficiency class, please refer to pages 141/143.

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It is possible to have a lot of power yet not
be able to use it. Only by using your power
intelligently will you truly progress – and
with consummate ease.
Porsche Traction
Management (PTM) is
standard on all 911 Carrera all-wheel-drive
models. It is an active all-wheel- drive
system with an electronically variable
map-controlled multi-plate clutch,
automatic brake differential (ABD) and
anti-slip regulation (ASR). Drive power is distributed bet ween the
permanently driven rear axle and the
front axle by means of the electronically
variable multi
-plate clutch.
The status 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, includ -
ing 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 begin
to lose traction under acceleration, a
greater proportion of the drive power
is automatically transmit ted to the front
axle by a more positive engagement of
the multi-
plate clutch. In addition, ASR
prevents wheel spin by adapting the
engine’s power output. During cornering,
the optimal level of drive power is
dis
tributed to the front wheels to ensure
excellent lateral stability. In conjunction with Porsche Stability
Management (PSM), PTM helps to ensure
the perfect distribution of drive power for
optimum traction in most road scenarios,
whether on long straights, through tight
corners, or on surfaces with different
friction coefficients.
Far better than a power struggle
is power interplay.

Porsche Traction Management (PTM).
T
emperament | Transmission

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Responsibility
|
Motorsport
It’s hard to say what has been our most emotional moment on the racetrack.
We have more than 60 years’ worth of them.

Porsche Motorsport.
To be able to call upon more than 60
years of experience as you bat tle for
every hundredth of a second out on the
track – that ’s what Porsche Motorsport is
all about. Our driving force is our teams
– all those people, from driver to
engineer, who work tirelessly on major
racetracks throughout the world to take
us forward. They have been realising and
living one shared dream for generations:
Ferry Porsche’s dream of a car that
could be both victorious on the track and
practical on the road. And from that
dream, more than 30,000 victories have
ensued to date. Victories achieved, for example, with
the Porsche 956 – one of the most
successful race cars of all time. And

with those that continue to show that
same potential, such as the 911 RSR

and the 911 GT3 Cup.
Two race cars that have proven a
success in circuit and endurance events.
As successful as the entire brand,
Porsche Motorsport has so far built more
than 3,000 race cars, over 1,000 of
which are still in use today. They appear
at the lowest amateur levels and line up
at the very pinnacle of the sport, competing in US GT races and in 20 one-
make championships, including the
Porsche Carrera Cup Germany and the
Porsche Mobil 1 Supercup. New goals
are forever being set, not least for the
reappearance among the international
motorsport elite: in the FIA World
Endurance Championship and its
highpoint, the 24 Hours of Le Mans.

An LMP1 race car conceived from the
ground up is set to take to the grid
in the highest class there is with a
view to extending the run of 16 outright
wins at the Sarthe circuit.

For Porsche, however, what mat ters
even more than a place on the winners’
podium is how much experience is
gained, as well as the ideas that the race
inspires. Important findings from the
racetrack are transferred into series
production as design and test principles.
Our exhaust turbocharging or double-
clutch transmission technologies are two
examples. This proximit y bet ween the
racetrack and the road is unique. It lets
every Porsche customer take part in the
race – directly or indirectly. It lets the
customer feel what drives us. Yesterday,
today and tomorrow: Spirit. Vision.
Principle.