2004 PORSCHE 911 TURBO fuel consumption

To apply these benefits efficiently
to the road, we required another
innovation in sportscar design: all-
wheel drive with Porsche Traction
Management (PTM). Using an
electronically controlled multi-plate
clutch, this intelligent technology
provides variable drive to each
axle. The front/rear split is con-
tin
uously adjusted based on current
road conditions and driver inputs.
Although biased towards the rear,
the front receives more power
whenever the situation requires.
Porsche Traction Management
is specifically designed to
optimise driving dynamics. The
additional traction provided by
both the all-wheel drive system
and PTM represents a major
improvement in active safety,
especially in the wet or on snow.
Another benchmark technology
on the new 911 Turbo is the
standard braking system. The
front and rear discs have a
generous diameter of 350 mm.On the optional Porsche Ceramic
Composite Brake (PCCB), the
front diameter is increased to
380 mm.
Other standard features on the
new 911 Turbo include a new
evolution of Porsche Stability
Management (PSM) as well as
Porsche Active Suspension
Management (PASM) featuring
electronic damper control.
A
limited-slip differential is available
for the rear axle as an option.
For even greater performance, the
car can be equipped with the
optional Sport Chrono Package
Turbo. Key features include
an ‘overboost’ function which
provides as much as 60 Nm
of additional torque under
acceleration. When the throttle
is fully open, the boost pressure
is increased temporarily by
approximately 0.2 bar. The
electronic throttle map is
also adjusted to give a more
dynamic response to pedal
inputs.
Other modifications when ‘Sport’
mode is selected include a major
rise in the trigger threshold used
by Porsche Stability Management
(PSM). The all-wheel drive system
featuring PTM provides a similar
increase in driver involvement
by sending a greater proportion
of drive torque directly to the
rear wheels. PASM provides a
stiffer suspension setup enabling
faster turn-in and better road
contact.
Another major development
on the new 911 Turbo is the
car’s lightweight design and
construction. The doors and front
lid are made from aluminium
which offers a range of benefits
in terms of both performance
and economy. Every gram of
weight on every component
is there for a specific reason.
As a result, the standard model (with six-speed manual gearbox)
weighs just 1,585 kg. Even more
impressive are the power-to-
weight ratio of 302.8 bhp per
tonne and surprisingly low fuel
consumption.This powerful potential is, of
course, matched by exemplary
ride quality on every type of
road. This rare combination of
performance and comfort is one of the distinguishing features
of the 911 Turbo.
· 18 ·· 19 ·The new 911 Turbo |
The new 911 Turbo

· 36 · · 35 ·· 37 ·The new 911 Turbo |
Drive
Guide vanes open Guide vanes closedGuide vanes open Guide vanes closed
The capability of the engine can
be further enhanced by selecting
‘Sport’ mode on the optional Sport
Chrono Package Turbo (see page
60). Under full acceleration, the
boost is temporarily increased by
approximately 0.2 bar. During this
phase, the engine develops as
much as 60 Nm of additional
torque.
Matching the superlative
performance of the car is the
efficiency with which it is
generated. In spite of the increase
in power and torque, the new
911 Turbo offers a further
reduction in fuel consumption.
1
2
3
4
5
6
7
8
9
10
1. Turbine casing
2. Movable guide vanes
3. Turbine wheel4. Electric motor for guide
vane adjustment
5. Guide vane adjuster
6. Compressor casing7. Compressor wheel
8. Excess-pressure valve
9. Oil inlet
10. Coolant inlet340 500 540
580
620 660 700
220 240
260
280
300
1500
7500 2000 2500 3000 3500 4000 4500 5000 5500 6000 6500 7000
380 420
460
1000
Power (kW)
Engine speed (rpm)
620 Nm
120 140
160
180
200
Torque (Nm)
680 Nm
740 320
340 360380780 820860
353 kW (480 bhp)
911 Turbo
911 Turbo overboost

locked, the outermost ring –
which is driven by two large
profile cams – is in direct contact
with the valve. When the pin is
removed, the innermost lifter –
operated by a smaller cam
lobe – has sole influence over the
amount of valve lift. The timing of
each valve is steplessly controlled
by means of an electro-hydraulic
rotary vane adjuster at the head
of the corresponding camshaft.To improve responsiveness
during warm-up in cold weather,
VarioCam Plus will select the
higher valve lift setting and retard
valve timing.
At medium revs and low engine
loads, the lower valve lift setting
is selected and timing advanced in
order to reduce fuel consumption
and emissions. The economy of
the engine is particularly
enhanced at lower engine speeds.
For maximum power and torque,
the higher lift setting is selected
and the timing of the valves is
advanced.
From the driver’s perspective, the
results are clear: copious torque
with exceptional fuel economy,
particularly in comparison with
much larger yet similarly rated
engines.
· 39 ·The new 911 Turbo |
Drive
VarioCam Plus combines variable
valve timing with two-stage valve
lift on each inlet camshaft. The
resulting benefits include greater
power and torque at all engine
speeds, as well as smoother
running, better fuel economy and
fewer exhaust emissions.Essentially, VarioCam Plus offers
two engines in one. The first is
designed for normal road driving,
the second for high-performance
use. The system switches
seamlessly between the two
as driver inputs change. All
operations are centrally controlled
by the engine management
system. The result: emphaticacceleration and smoother
running.
The two-stage lift mechanism on
each inlet valve consists of an
electro-hydraulically switchable
tappet. Each of the 12 tappets
has two concentric lifters which
can be locked together by means
of a pin. When the tappets are
· 38 ·
VarioCam Plus.
Optimum valve timing, optimum valve lift, in all load conditions.

Engine cooling.
The 911 Turbo engine features
cross-flow water cooling with fully
integrated coolant management.
This technology ensures a
consistent flow of coolant to each
of the engine’s cylinders. All
coolant passages are integral to
the block, thus eliminating the
need for external hoses. Each
cylinder receives a fresh supply
of coolant which has not been
pre-warmed by the engine. As well
as improving reliability, this
helps to minimise maintenance
requirements. Waste heat from
the oil is transferred to the
coolant via two oil/water heat
exchangers. The coolant is routed
through twin radiator modules
ahead of the front wheels and a
centrally placed unit in the nose.
Engine management.
Optimum performance is assured
at all times with the aid of
the Motronic ME7.8.1 engine
management system. On the new
911 Turbo, this powerful ECU is
responsible for all engine-related
functions and assemblies (see
diagram). Key among these are
the Variable Turbine Geometry
(VTG), VarioCam Plus and
electronic throttle system – one
of the essential prerequisites
for the standard Porsche Stability
Management (PSM). The results:
optimum economy, emissions
and performance, regardless of
driving style.Another important task performed
by the engine management
system is cylinder-specific knock
control. By preventing pre-ignition
at high engine speeds, this
function can avert costly damage
to the pistons and cylinders. Since
temperatures tend to vary in
different parts of the engine, each
cylinder is monitored separately.
If a risk is detected, the individual
ignition timing is adjusted.
The EU-compliant on-board
diagnostics system provides
continuous fault detection and
early warning for the exhaust
and fuel supply systems. The
resulting benefits are active
prevention of harmful emissions
as well as consistent rates of
fuel consumption.
· 40 ·· 41 ·The new 911 Turbo |
Drive
Input data Used to regulate /control
Engine management system
(Motronic ME7.8.1)
Engine load
Pressure upstream from throttle
Throttle-valve angle
Engine speed (from crankshaft)
Camshaft phase angles
Throttle-pedal position
Lambda signal
Knock sensor signal
Ignition
Fuel injection
Throttle valve
Heating elements in lambda sensors
Fuel pump
Fuel-tank venting
CAN interface to
all-wheel drive control unit CAN interface to transmissionMoment interface to Porsche
Stability Management (PSM)
VarioCam Plus
– camshaft phase angle
– valve lift control
Electronic controller for
Variable Turbine Geometry (VTG)
Bypass valve
Secondary air injection
Engine-bay fan
Starter
On-board diagnostics
Air-conditioning compressor
Interface to instrument cluster
Radiator fans
Vehicle speed
Air-conditioning settings
Engine immobiliser status
Clutch pedal switch
Ambient air pressure
Temperatures
– coolant
– airflow upstream from throttle
– engine oil
– air in engine compartment
– ambient air
Exhaust-gas temperature

Fuel injection.
Fuel is supplied to each of the six
cylinders by means of sequential
fuel injection. The timing of each
injection and the volume supplied
to each bank of cylinders are
controlled by the Motronic ME7.8.1
engine management system.
Adjustments are based on a range
of variables, such as throttle
position, engine speed, boost
pressure, coolant temperature
and exhaust gas composition. Theresults are optimised combustion
and fuel consumption. A hot-film
air mass sensor monitors the
density of the incoming air to
ensure the optimum air/fuel
mixture, regardless of weather
and altitude.
Ignition system.
The 911 Turbo is equipped with
a static high-voltage ignition
system. Each individual plug has
a separate ignition coil, ensuring
perfect combustion every time.
The role of distributor is performed
by the engine management
system, which operates the coils
directly. The result: optimum
performance with minimal fuel
consumption.
· 42 ·· 43 ·The new 911 Turbo |
Drive

Porsche Communication
Management (PCM). This
comprehensive system features
satellite navigation with a
separate DVD drive in the
luggage compartment for
the single navigation disc.
The one-touch switches on the
centre console are logically
positioned for optimum ease of
use. All instruments are perfectly
placed within the driver’s field of
vision. The air-conditioning system
is fully automatic and features a
highly effective active carbon filter.
This added convenience gives
you greater freedom to enjoy the
driving experience.
The tinted front glass and generous
rear screen offer excellent fore-
and-aft visibility. The front side
windows have a water-repellent
finish, which automatically
disperses moisture and dirt.
The result: optimum visibility in
poor weather conditions.
Instruments.
The classic arrangement of five
round instruments provides a
clear overview of all key information.
The digital display in the centre-left
dial (speedometer) provides main
and trip odometer readings. The
central rev counter, featuring the
‘turbo’ logo, includes the standard
on-board computer display.
This multi-purpose field contains a
permanent digital speedometer
as well as the following optional
information: boost pressure,
average speed, average fuel
consumption, tyre pressure,
current radio station, navigation
instructions and remaining range
till empty. When ‘Sport’ mode
is selected on the optional Sport
Chrono Package Turbo, the
temporary increase in torque is
clearly indicated using an arrow
symbol in the boost pressure
display. The third display, in the
centre-right dial, contains a
clock and external temperature.
The dot-matrix technology used in
each of these displays provides
a high resolution for icons and
text. Design and legibility are
further enhanced with brilliant
white backlight illumination.
· 78 ·· 79 ·The new 911 Turbo |
Comfort
Interior.
For the pure enjoyment of performance.
The passenger compartment in the
new 911 Turbo is another example
of uncompromising design. As you
would expect, it offers the highest
standards of ergonomics, comfort
and quality. The seats, dashboard,
doors and rear side panels are
finished in leather as standard. Atthe centre of the cockpit is a new
gear lever design that’s exclusive
to the new 911 Turbo.
Other standard features include
a three-spoke sports steering
wheel offering 40 mm of
adjustment for both height and
reach. A three-spoke multi-function
steering wheel – available as
optional equipment – provides
direct access to audio, navigation
and (if fitted) telephone functions.
The standard audio package
is the latest evolution of

Antenna diversity.
The PCM package includes four
separate antennae which are
discreetly incorporated within the
windscreen glass. This simple
solution enables the twin-tuner
radio system to find the strongest
possible signal, thereby enhancing
FM reception.
On-board computer.
The PCM computer offers a wide
range of information, including
average fuel consumption, average
speed, range till empty, journey
time and external temperature.
It can also be used to view data
from the optional Tyre PressureMonitoring (TPM). The computer
is operated using a separate
control stalk, displaying key infor-
mation in the central instrument
dial. The same control stalk
is used to operate the timing
functions in the optional Sport
Chrono Package Turbo.
Electronic logbook.
This optional addition to PCM
enables automatic logging on
every journey of mileage, route
distance, date and time as well as
starting location and destination.
Data can be downloaded from
PCM via an infrared port and
processed on a computer using
software included with the
package. This easy-to-use option
fulfils all the requirements for
automatic logbooks as specified
by the German revenue authorities.
Telephone module.
The optional GSM telephone has
a 12-digit keypad and a hands-
free facility offering excellent callquality. The hands-free microphone
is located next to the steering
column and is ideally positioned
for the driver. The telephone
system supports SMS (text)
messaging as well as card-free
calls to emergency services. An
optional passive (keyless) handset
with leather-trimmed console
enables clearer communication
as well as greater privacy when
making a call.
CDC-4 CD autochanger.
This optional CD autochanger has
a total capacity of six audio
CDs and installs beneath a panel
in the luggage compartment.
An autochanger preparation is
included as standard.
· 88 ·· 89 ·The new 911 Turbo |
Comfort
Passive (keyless) handset

At Porsche, we’re exploring every
possibility to improve the environ-
mental compatibility of our cars:
modern materials, reduced fuel
consumption, cleaner emissions,
fewer pollutants and better
recyclability. This commitment is a
Porsche tradition that began in
the 1960s. With the latest evolutionof the 911 Turbo, the rewards are
even greater than ever.
Exhaust emission control.
Combine engineering expertise
with a commitment to the
environment and the resulting
benefits are twofold: exceptional
performance and lower emissions.
One of the cleanest sportscars
in the world today, the new
911 Turbo easily complies with
both the stringent Euro 4 standard
in the European Union as well
as LEV II regulations in the United
States.The technologies used to achieve
this compliance include twin
‘lambda’ or oxygen sensors for
each of the two cylinder banks.
One pair of sensors is used to
measure the levels of oxygen in
each of the twin exhaust tracts.
An additional pair of sensors –
again, one in each tract – enablethe engine management system
to monitor the efficiency of the
catalytic converters.*
Recycling.
Lightweight construction, long-
term durability, exceptional
recyclability: just three of the
techniques employed by Porsche
to improve the environmental
compatibility of our cars.
On the new 911 Turbo, we’ve
used weight-saving design and
lightweight materials to achieve
excellent fuel economy.
All materials and manufacturing
processes have been carefully
selected and specifically refined
to reduce any impact on the
environment. A prime example is
the twin exhaust system, which is
made entirely from stainless steel.
All lightweight materials are easily
recyclable, while the variety ofsynthetics has been significantly
reduced. Recycled plastics are
used in every area of the car
where our exacting specifications
allow. To simplify processing, all
materials are labelled for separate
recycling. Approximately 85 % of
today’s 911 Turbo is compatible
with current recycling techniques.
Water-based paints are used
throughout the car, thus reducing
the need for chemical solvents in
both production and subsequent
servicing. Other harmful materials
omitted from the vehicle include
asbestos, CFCs, and components
manufactured using CFCs.
The result is a car in which
environmental protection is an
integral part of the overall design.
· 94 ·· 95 ·The new 911 Turbo |
Environment
* Not in markets with leaded fuel.
The 911 Turbo is dedicated to performance.
Also with respect to the environment.