2004 PORSCHE 911 TURBO ABS

using the automatic brake
differential (ABD) function. For
optimum traction, manual gearbox
cars can also be equipped with
an optional mechanical limited-slip
rear differential (see page 56).
Assisting PTM is a new and
specially uprated version of
Porsche Stability Management
(PSM – see page 58). Combined,
these systems ensure optimum
torque distribution – and thus
optimum drive – in every type of
road scenario, including high-
speed straights, hairpin bends and
challenging, variable-grip surfaces.
Under heavy braking where ABS
is required, the multi-plate clutch
severs all front drive so that
each front wheel can be controlled
separately
by the ABS without
being influenced by the rear wheel
dynamics.
The traction benefits of the new
electronically controlled system
are particularly apparent in
the wet or on snow. In these
conditions, the new 911 Turbo
offers breathtaking acceleration.
In short, PTM offers greater
active safety, greater performance,
and even more of the positive
handling and agility you’d expect
from a 911 Turbo.
· 49 ·The new 911 Turbo |
Drive
differential (ABD) and anti-slip
regulation (ASR).
The electronically controlled clutch
is used to vary the drive torque
transmitted to the front axle. The
previous 911 Turbo had a multi-
plate clutch filled with a viscous
fluid, which ‘passively’ determined
the front/rear torque split. On
this latest evolution, the fluid is
replaced by active, electronic
control.While the viscous-fluid system
responds to relative differences in
front/rear axle speed, the new
electronic clutch offers a more
direct response to changing road
scenarios. The status of the car
is continuously monitored with the
aid of on-board sensors. These
are used to measure a range of
values, including the rotational
speed of all four wheels, the lateral
and longitudinal acceleration of
the car, and the current steering
angle. The sensor data is analysed
in ‘real time’ by PTM, enabling
immediate adjustments in front-end
drive torque as and when required.
If, for example, the rear wheels
lose traction under acceleration, a
greater proportion of drive torque
is automatically transmitted to
the front axle. The integral ASR
function is also used to minimise
wheel-spin. When
cornering,
the system controls drive to the
front wheels in order to maintain
optimum lateral grip. On variable-
grip surfaces, traction is enhanced
· 48 · Electronically controlled multi-plate clutchAll-wheel drive system
Genuine high performance calls for
more than just a powerful engine.
It also requires an effective means
of applying that power to the road.
On the 911 Turbo, this is achieved
by means of permanent all-wheel
drive and an all-new version of
Porsche Traction Management
(PTM). The key mechanical feature
within the AWD system is the
electronically controlled multi-plate
clutch. Integral functions within
PTM include an automatic brake
Electronically controlled all-wheel drive with Porsche Traction Management (PTM).
The intelligent application of power and torque.

This latest evolution of Porsche
Stability Management (PSM)
provides automatic assistance in
critical road scenarios. A powerful
driver aid, it uses a range of
sensors to monitor the direction,
speed, yaw velocity (speed of
rotation around the vertical axis)
and lateral acceleration of the car.
With this information, it can
then calculate the actual direction
of travel. If the car begins to
oversteer or understeer, PSM
applies selective braking onindividual wheels to bring it safely
back into line. Whenever PSM is
required to intervene, an indicator
light in the cockpit is illuminated.
Another scenario in which PSM is
invaluable is when applying the
throttle on wet or other low-grip
surfaces. Here, PSM uses the ABD
(automatic brake differential) and
ASR (anti-slip regulation) functions
in PTM to maintain traction and
stability.Standard equipment on the
911 Turbo, PSM assists with high-
precision inputs that enhance the
athleticism and agility of the car.
When ‘Sport’ mode is selected
on the optional Sport Chrono
Package Turbo (see page 60),
the PSM threshold is raised
higher still enabling greater driver
involvement – particularly
at speeds of up to 70 km / h
(44 mph).
The integral ABS ensures shorter
braking distances in critical road
scenarios. System inputs are
smooth and precise fo r greater
driver comfort. Active safety is
further enhanced with the aid of
two additional brake functions:
electronic brake prefill and brake
assist.
The prefill function is automatically
enabled whenever the throttle
pedal is suddenly released. The
pressure in the brake lines is
marginally increased, bringingeach of the pads into light contact
with the corresponding disc. If
the driver then decides to use the
brakes, the system can apply
the maximum force with virtually
no delay.
The brake assist function is
specifically designed for use in
emergency stops. When the
pressure on the brake pedal
exceeds a predefined threshold,the brake assist function uses
the PSM hydraulics to apply the
pressure required for maximum
deceleration. The result: shorter
braking distances.
For a more natural drive, PSM can
be manually disabled leaving only
the automatic brake differential
(ABD) in place. Although essentially
inactive, PSM remains present in
the background and can intervene
immediately under heavy braking
where at least one front wheel
requires ABS assistance. In ‘Sport’
mode, PSM will only respond
when ABS is active on both front
wheels.
In short, PSM provides the ideal
balance between electronically
assisted active safety and
freedom to enjoy the car’s
potential.
· 58 ·· 59 ·
Oversteer without PSM Oversteer with PSM
Car steers off line
Car steers off line PSM corrects
steering and
stabilises car
PSM corrects
steering and
stabilises car
Understeer without PSM Understeer with PSM
The new 911 Turbo |Chassis
Porsche Stability Management (PSM).
Enhanced stability control for the new 911 Turbo.

For maximum manoeuvrability,
PSM can be partially disabled
while the car is still in ‘Sport’
mode. PSM simply monitors the
forces acting on the car and
will only intervene in the most
critical of situations, e.g., when
ABS assistance is required on
both front wheels.
To help you quantify this
increased performance, the
Sport Chrono Package Turbo
includes a swivel-mounted timer
on the dashboard. Functions
are accessed via the control
stalk for the on-board computer.
Analogue dials measure hours,
minutes and seconds, while aseparate digital field displays
whole seconds, tenths and one
hundredths of a second. The
digital field runs in parallel with
a second display which is
conveniently located in the
instrument cluster.
Individual lap times can be
viewed, stored and analysed using
a special ‘performance display’
added to Porsche Communication
Management (see page 86).
Available information includes the
time and distance travelled on
the current lap, as well as the
number of laps completed and
the respective times. The system
can also display the current
fastest lap and remaining range
till empty. Driving times can be
recorded for any stretch of road
and benchmark times can be
defined. Other useful features
include a memory function
accessible via PCM. This can beused to store a range of personal
preferences, such as daytime
driving lights, ‘Welcome Home’
light function, air conditioning,
rain sensor activation and door-
lock mode.
· 62 ·· 63 ·The new 911 Turbo |
Chassis

Power, torque, acceleration,
and flexibility: in every respect,
thenew911Turboismore
accomplished than ever before.
The logical adjunct to all these
improvements is a corresponding
increase in brake performance.
To achieve that capability, the
standard braking system combines
six-piston fixed calipers at the
front of the car with newly devised
four-piston units at the rear.The red-painted calipers have a
monobloc (one-piece) aluminium
construction offering greater
stability, better ‘bite’ character-
istics under heavy braking, and
a further reduction in unsprung
weight. The brakes are quick
to apply and release, while the
pedal travel is short and the
bite point precise and consistent.
The front and rear discs have a
generous diameter of 350 mm.
All four discs are cross-drilled for
better performance in the wet.
The distinctive drill-hole pattern
enables a faster response by
allowing rapid dispersa l of the
water vapour generated under
braking. The discs are also
internally vented for better heat
dispersal. The result: excellent
stability in all conditions.
Other features include four-
channel ABS offering a smoother,
low-pulse action. Brake spoiler
elements provide effectivecooling for all key brake
components. A powerful tandem
brake booster unit enables easier
pedal inputs.Braking distances are further
reduced with the aid of two new
functions in the latest evolution
of the standard Porsche StabilityManagement (PSM): electronic
brake prefill and brake assist
(see page 58).
· 68 ·· 69 ·The new 911 Turbo |
Safety
Standard brake unit
(front axle)
Active safety: braking system.
Always quick when you have to be slow.

The 911 Turbo easily complies
with all statutory requirements in
all markets worldwide in respect
of frontal, side, diagonal and rear
impact protection.
The reinforced bodyshell contains
a highly resilient passenger
cell offering exceptional crash
protection. At the front of the
car, the cell is protected by apatented system of longitudinal
and transverse members (1). In
the event of an accident, energy
is absorbed by three separate
load paths, one above the other,
which disperse the force of
impact and minimise deformation
of the passenger cell.The upper section of each door
features additional reinforcements
(4) which enhance the rigidity of
the car. An additional load path
(5) is used to channel energy
through the upper part of the shell
and protect the passenger cell.
In 1985, Porsche began using
super high-strength steel elements
in its door design to provide
greater occupant protection. On
the new 911 Turbo, this integral
reinforcement is made from
robust yet lightweight aluminium.
By increasing the proportion ofaluminium alloys and high-strength
steel, we’ve also increased the
car’s power-to-weight ratio. No less
than 20 % of the new 911 Turbo
is made from aluminium.
As you would expect, the entire
bodyshell structure receives
a highly effective anti-corrosion
treatment. Thirty years ago,
Porsche became the first manu-
facturer in the world to use
a hot-dip galvanised steel shell.
This exacting proces s is
absolutely fundamental to the
legendary durability of our cars.It also
ensures a consistently
high standard of crash protection,
even after many years on the
road. To underline our confidence
in this exceptional build quality,
the 911 Turbo comes with a
ten-year anti-corrosion warranty,
three-year paint warranty and
two-year warranty on the car as
a whole.
· 72 ·· 73 ·The new 911 Turbo |
Safety
1
1
1
5
4
3
3
12
Sheet steel
Tailored blanks
High-strength steel
Super high-strength steel
Aluminium Passive safety: bodyshell structure.
Adding strength, reducing weight.
Additional features include an
ultra-rigid bulkhead cross-member
(2) made from super high-strength
steel. This element is designed
to absorb impact forces from the
longitudinal members and thus
protect the front footwells. In a
minor collision, a system of easily
replaceable impact absorbers
(3) prevents costly damage to the
underlying bodyshell structure.

Complementing the front airbags
is the latest generation of Porsche
Side Impact Protection (POSIP).
This comprehensive package
includes two additional airbags for
each front seat: a thorax airbag
in the side of each backrest,
and a head airbag located in each
door. Each side airbag has anapproximate volume of 8 litres,
ensuring maximum protection
over the entire seat adjustment
range. Also incorporated within
the POSIP package are side-
impact protection beams in the
doors.Other standard features include
integral head restraints, an
energy-absorbing steering column,
height-adjustable three-point seat
belts with pre-tensioners and
force limiters, energy-absorbing
structures in the dashboard area
and flame-retardant materials
throughout the interior. The new 911 Turbo has a unique
passive protection system
featuring six separate airbags.
The full-size front airbags for
driver and front passenger have
a two-stage inflation capability.
With this technology, the
deployment of each airbag is
dependent on the force and
nature of the accident (e.g.,
frontal or diagonal impact). In
a low-speed crash, the airbag
is only partially inflated, thereby
minimising discomfort to the
occupants.
The airbag control unit is located
in the centre tunnel where it
receives additional information
from a pair of impact sensors near
the headlights. This arrangement
enables faster and more accurate
evaluation of impact forces in the
event of a crash.
· 74 ·· 75 ·The new 911 Turbo |
Safety
Passive safety: airbags.
Added side protection with intelligent deployment.

· 120 ·· 121 ·
Factory
collection 911
From our hands to yours.
Where better to experience the
first moments with your Porsche
than at the home of Porsche
engineering.
Almost 60 years ago, our first
large-scale production models
were crafted by hand in a modest
red-brick building, here in
Zuffenhausen. From those humble
beginnings, the factory has
evolved into one of the most
advanced production facilities in
the world. Today, it’s home to anew generation of legends: the
911, the Boxster, the Cayman S
and, of course, your Porsche.
Our factory collection programme
offers a unique insight into
the origins and making of your
Porsche. Like your car, a visit to
Zuffenhausen is an absorbing mix
of past and future, history and
innovation, heritage and creativity.
To take advantage of this exclusive
opportunity, please inform your
Porsche Centre when you place
your specification. A collection
date can then be arranged when
final information regarding the
build of your car has been
confirmed. Your Porsche can be
Make the most of your journey.
And discover more about your
Porsche.
Our factory tour offers a detailed
insight into the latest production
processes. These range from
engine assembly and the prep-
aration of upholstery, to the
‘marriage’ of powertrain and body.
The factory tour is one of our
oldest traditions, and is usually
conducted by a retired member
of staff. Each of our guides is
a genuine Porsche enthusiast
with a genuine passion for the
marque. On average, the tour
takes around one-and-a-half
hours to complete, and follows
delivery of your Porsche. The keys
will be presented by a member
of the Factory Collection Team
who will explain everything you
need to know about the car.
You can now take your place
behind the wheel, and experience
what it means to drive your
own Porsche. For the perfect
introduction to the pleasure
of Porsche ownership,* you may
wish to combine your visit with
one of the exclusive offerings
from the Porsche Travel Club.
Each one offers a fascinating
blend of culture, adventure and
first-class hospitality.
every stage in the building of
a Porsche.
Next, you can visit the Porsche
Museum, where you’ll find a
fascinating cross-section of
legendary Porsche models from
every era of our history.
If there’s time, you can relax with
a refreshment in the customer
lounge or browse in the Porsche
Design Driver’s Selection shop.
You can also enjoy a three-course
lunch at our exclusive guest
restaurant.
The highlight of your visit,
however, will undoubtedly be
the moment when you finally take
Porsche factory in ZuffenhausenPorsche Design Driver’s Selection shopPorsche Museum
collected on any working day*
(Monday to Friday) at a time that
suits your requirements.
The easiest way to travel from
outside Germany is to fly to either
Stuttgart or Frankfurt and then
continue by train, taxi or hire car.
Please note that there are a
number of formalities that must be
completed when you take delivery
of your car. For full details, please
consult your Porsche Centre, who
will also be happy to assist when it
comes to planning your trip.
* Please note that collection is not possible
during the factory shutdown periods.* Depending on insurance regulations
for your market.

· 126 ·· 127 ·
Technical data911 Turbo
WeightsManual/ Tiptronic S
Unladen weight (DIN)1,585 kg/1,620 kg
Unladen weight (EC)*1,660 kg/1,695 kg
Permissible gross weight1,950 kg/1,980 kg
PerformanceManual/ Tiptronic S
Top speed310 km / h/310 km / h (193 mph/193 mph)
0 –100 km / h (0 – 62 mph)3.9 secs/3.7 secs
0 –160 km / h (0 – 99 mph)8.4 secs/7.8 secs
0 – 200 km / h (0 –124 mph)12.8 secs/12.2 secs
Flexibility 80 –120 km / h 3.8 secs/3.5 secs
(50 –75 mph) in second highest gear
Fuel consumption/emissionsManual/ Tiptronic S
In accordance with 80 / 1268 /EC as valid at time of going to press**
Urban18.8/19.8 l/100 km (15.0/14.3 mpg)
Extra urban9.5/9.6 l/100 km (29.7/29.4 mpg)
Combined12.8/13.6 l/100 km (22.1/20.8 mpg)
CO2emissions307/326 g/km
Dimensions /aerodynamics
Length4,450 mm
Width1,852 mm
Height1,300 mm
Wheelbase2,350 mm
Luggage compartment volume105 litres
Tank capacity 67 litres
(refill volume)
Drag coefficient
0.31
911 Turbo
Engine
Cylinders6
Displacement3,600 cm3
Max. power (DIN)353 kW (480 bhp)
at6,000 rpm
Max. torque620 Nm (with overboost: 680 Nm)
at1,950 – 5,000 rpm (with overboost: 2,100 – 4,000 rpm)
Compression ratio9.0 :1
Transmission
LayoutAll-wheel drive with electronically controlled multi-plate clutch
Manual gearbox6-speed
Tiptronic S (optional)5-speed
Chassis
Front axleMcPherson-strut suspension
Rear axleLSA multi-link suspension
SteeringVariable steering ratio, power-assisted (hydraulic)
Turning circle10.9 m
Brakes6-piston monobloc aluminium fixed calipers at front, `
4-piston monobloc aluminium fixed calipers at rear,
discs internally vented and cross-drilled
Vehicle stability systemPSM (updated version)
Anti-lock braking systemABS 8.0
WheelsFront: 8.5J x 19 ET 56
Rear: 11J x 19 ET 51
Ty r e sFront: 235/35 ZR 19
Rear: 305/30 ZR 19* Weight is calculated in accordance with the relevant EC Directives and is valid for standard specification vehicles only.
Optional equipment means greater weight. The figure given includes 68 kg for the driver and 7 kg for luggage.
** Provisional data only. Final data unavailable at the time of going to press.