2009 PORSCHE 911 mileage

Expansion intake manifold.
More power for less fuel. What
sounds absurd is sometimes
quite simple. You just have to
have the nerve to question
prin ciples that are seemingly
writ ten in stone.
The 911 Turbo and 911 Turbo S
models have an innovative expan -
sion intake manifold that was
used for the first time on the latest
911 GT2. Its unique operating
principle is unlike any thing ever
featured on existing induction
systems. Our ‘expansion’ intake
manifold is a radical development
that is the polar opposite of the
resonance principle used on con -
ventional turbocharged engines.
A resonance manifold increases
engine output by forcing addi
tional
air into the combustion chambers.
To do this, the manifold is designed
in such a way that the air – which
vibrates due to the action of the
valves – is in a compression phase
as it passes through the inlet ports.
Unfortunately, compression not
only increases air volume, it
also increases air temperature
and this has a negative effect
on ignition.
Our expansion manifold simply
turns that principle around. The
internal geometry is radically
different from that on a resonance
intake system. Key modifications
include a longer distributor pipe,
with a smaller diameter, and
shorter intake pipes. As a result,
the air is in the expansion phase
as it enters the combustion

chambers. Since expansion always
cools, the air/fuel temperature is
lower and ignition is significantly
improved – thereby increasing
performance.
Of course, the amount of air that
enters the engine under expan -
sion is less than it would be under
compression. To compensate
for this, we’ve simply increased
the boost pressure. The resulting
increase in temperature – again
through compression – is immedi -
ately offset by the uprated inter -
coolers. Instead of hot compressed air
entering the combustion

chambers, we now have cooler

air generating more power and
torque. As a consequence, there
is a major improvement in engine
efficiency and therefore lower fuel
consumption even under heav y
loads and at high revs.
As we said, sometimes you just
have to question established
ideas.
Exhaust system.
The exhaust system is made
from stainless steel. Its cataly tic
converters are extremely heat-
resistant, yet quick to reach
temperature – and thus optimum
performance – when the engine
is started from cold.
Advanced exhaust gas technology
ensures compliance with stringent
emissions standards, e.g. Euro 5
in EU markets, LEV II/ LEV in the
USA.
Servicing.
The 911 Turbo and 911 Turbo S
models are designed for a long
life. A self-adjusting belt drives
the generator, power-steering
pump and air-conditioning com -
pressor. Valve clearances are
adjusted hydraulically, thus avoid -
ing the need for any adjustment
work. The camshafts are driven
by timing chains that require
no maintenance and the ignition
system, with the exception of
the spark plugs, is also mainte -
nance-free. The cars come with
a t wo -year unlimited mileage
w a r ra n t y.
The long service intervals (see
separate price list) keep costs
and labour times down and save
resources, since fewer service
products and consumable parts
are used.
Performance | Engine
911 Turbo engine and exhaust system
· 40 ·· 41 ·

Porsche Communication
Management (PCM).
Fit ted as standard, PCM is the
central information and commu -
nications system. It is both
multifunctional and very easy to
operate.
The main feature is the 6.5-inch
touchscreen for intuitive control.
For radio listeners, there is an
FM t win tuner with RDS, which
constantly scans for the best signal for the selected station,
and up to four radio aerials for
optimum reception.
The integrated single CD/ DVD
drive of the 911 Turbo models
can, in combination with the
standard BOSE
® Surround Sound
System, replay music from audio
and video DVDs in 5.1 Discrete
Surround Format. As an option,
a six-disc CD/ DVD autochanger
can also be integrated in PCM
(standard on 911 Turbo S
models). The standard GPS navigation
module has a hard drive with

map data for most European
countries. When viewing a map,
it is possible to select either a
3D perspective or a 2D display.
Electronic logbook.
The optional electronic logbook
enables automatic recording
of mileage, route distance, date
and time, starting point and
destination for each journey.
TV tuner.
A T V tuner, available as an option,
receives unencoded analogue
and digital television broadcasts
(DVB-T) to provide entertainment
bet ween journeys. For your
safet y, the T V picture cannot be
displayed while the vehicle is in
motion.
Voice control system.
Almost all of the functions of PCM
can be controlled via the optional
voice control system. The main
menu item is read aloud exactly
as it is displayed on the screen
and the voice control system
recognises commands or number
sequences, irrespective of the
speaker. It gives audible feedback
and guides you through the
functions. There is no need to
‘train’
the system. Phone book
entries can be retrieved, a radio
station selected or the navigation
destination entered directly by
speaking whole words.
Telephone module for PCM.*
The standard GSM telephone
module offers convenience and
excellent reception. By inserting
a SIM card directly into PCM’s
integral SIM card reader, calls
can be made using the hands-free
facilit y. For even more conven -
ience, the Bluetooth
® capabilit y
of a mobile phone can be used
to make calls via the SIM Access
Profile (SAP). Once automatic
pairing is complete, the mobile
phone’s aerial is switched of f to
conserve bat tery charge and the
phone operates via the car aerial.
Depending on the mobile phone
model, this gives access not only
to the numbers on the SIM card,
but also to the phone’s internal
memory. Depending on the phone,
it can also be controlled using
PCM, the optional multifunction
steering wheel or the optional
voice control system, without it
ever leaving your pocket.
In addition, the telephone module
enables you to establish a
Bluetooth
® link with those mobile
phones that only support the
Handsfree Profile (HFP). In this
case, the GSM connection is
always established through the
aerial of the mobile phone.
PCM acts as a hands-free system
and you can leave the mobile
phone tucked away. On request,
a cordless handset for the tele -
phone module is also available.
However, the handset cannot be
used for Bluetooth
® links estab -
lished using the Handsfree Profile
(HFP).
Porsche Communication Management (PCM) Cordless handset
* Note: see page 104.
Personality | Comfort
· 86 ·· 87 ·