2004 PORSCHE 911 TURBO Information Manual

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.
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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.

The new 911 Turbo is a prime
example of the ongoing evolution
of Porsche engineering. For
another step up in all-round
performance, there’s the optional
Sport Chrono Package Turbo.
This integrated system provides
simultaneous enhancement
for engine, chassis and optional
Tiptronic S transmission.
Key features include a digital and
analogue timer located centrally
on the dashboard, a ‘Sport’ select
button on the centre console,
a performance display in the
standard Porsche Communication
Management (PCM), a personal
memory function in PCM, and
a special ‘overboost’ function
unique to the new 911 Turbo.When ‘Sport’ mode is selected,
the engine management system
applies a new set of variables
creating a much more aggressive
response. A modified throttle
map relates the pedal position in
the footwell to a wider angle
of opening on the throttle. As a
result, the engine has a much
more positive reaction to every
pedal input. In the higher gears,
a hard rev-limiter helps protect
the engine under power.
Under full acceleration, the
‘overboost’ function provides a
temporary increase in available
boost pressure of approximately
0.2 bar. The overboost is applied
across the medium rev range,
raising the standard 620 Nm of
torque to as much as 680 Nm.
The modified throttle is matched
by PASM, which also switches
to ‘Sport’ mode. The dampers
become firmer, enabling fasterturn-in as well as better contact
with the road.
On vehicles with Tiptronic S,
the basic gearshift pattern is
automatically switched to high-
performance mode. The gearshift
action is virtually instantaneous,
while the shift points are timed for
maximum acceleration. Lift off
the throttle – even at high revs –
and the system automatically
shifts down to apply engine
braking. There are no unwanted
upshifts in manual mode when
approaching the engine rev limit.
Since the driver has control over
every upshift, the handling of
the car is smooth and assured,
particularly when braking for a
corner.
To minimise assistance from
PSM, the trigger threshold for
this system is raised. The result
is a more natural and involving
response to both lateral andlongitudinal forces. Mid-corner
agility is considerably enhanced,
with greater scope for oversteer
on turn-in and exit. This added
freedom is particularly apparent
in lower-speed sequences and
bends. For even greater driving
pleasure, the all-wheel drive
system applies a greater
proportion of drive torque to the
rear.
· 60 ·· 61 ·The new 911 Turbo |
Chassis
‘Sport’ button on centre console
Sport Chrono Package Turbo.
Additional power, precision timing.

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.
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Chassis

· 64 ·· 65 ·The new 911 Turbo |
Safety
What is the secret of
uncompromising performance?
Always put safety first.
Safety

The horizontal indicators in the
outer front air intakes feature high-
performance light-emitting diodes
(LEDs) for optimum visibility.
The standard front foglights on
the front apron moulding are
another distinctive design feature
on the new 911 Turbo.
At the rear of the car, the High-
Level third brake light is also
equipped with fast-response LEDs.
A pair of additional lights on the
inside of each door offer greater
convenience and safety at night.
The kerb light (white) provides
greater visibility when exiting the
car. The safety light (red) warns
traffic approaching from the rear
that the door is currently open.
The standard lighting system on
the new 911 Turbo features the
latest Bi-Xenon gas-discharge
technology offering a light quality
similar to daylight. The compact
main headlights provide a broad
swathe of light, ensuring greater
active safety in all road scenarios.Each headlight unit contains a gas-
discharge lamp featuring dynamic
range control. This automatic
adjustment of the light-beam angle
prevents hazardous dazzling of
oncoming vehicles due to small
undulations in the surface of the
road or heavy rear-end loads.The brightness of the lights is
approximately twice as great as
that of a halogen lamp. Other
standard features integral to the
system include a headlight cleaning
function.
· 66 ·· 67 ·The new 911 Turbo |
Safety
High-Level third brake lightBi-Xenon headlight
Active safety: lighting system.
Bright ideas for the darkest night.

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 new 911 Turbo is also
available with an optional high-
performance braking system:
the Porsche Ceramic Composite
Brake (PCCB). Successfully
tested in the toughest endurance
racing, this unique technology
has been further refined for even
greater road performance.The key components in PCCB
are the moulded ceramic discs
(front/rear diameter: 380 mm/
350 mm). The larger front discs
provide greater leverage and
therefore better brake performance.
Thediscsaremadefrom a
specially treated carbon-fibre
compound that is silicated in a
high-vacuum process at 1,700 ºC.
The resulting material is not
only much harder than metal, it
is also more resistant to heat.
Even at high temperatures, the
thermal resistance of the PCCB
disc ensures excellent dimensional
stability. The ceramic material is
totally resistant to corrosion and
offers excellent acoustic damping
properties.The pads are mounted in six-
piston monobloc aluminium
fixed calipers at the front, with
four-piston units at the rear.
The resulting brake forces are
not only extremely high, they are
also exceptionally consistent.
The pedal response is fast andprecise, with only moderate input
required.
The key advantage of PCCB is the
total weight saving over comparable
metal discs of approximately 50 %.
As well as enhancing performance
and fuel economy, this represents
a major reduction in both the
unsprung and rotating masses.
This, of course, produces
additional benefits in terms of
comfort and road-holding on
uneven road surfaces as well as
general handling and agility.
For more information, see thelatest PCCB brochure available
from your Porsche Centre.
· 70 ·· 71 ·The new 911 Turbo |
Safety
PCCB
Porsche Ceramic Composite Brake (PCCB).
When it comes to developing new brake technology,
nothing holds us back.

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.