(from Audi Press Release) A
high-performance sports car, a roadgoing vehicle that could be said to
have inherited the genes of the Audi R8, three-times winner of the Le
Mans 24-Hours race: Audi reveals its ‘Le Mans quattro’ concept study.
This fascinating driving machine is a synthesis of the experience gained
from numerous racing triumphs, allied to advanced design and Audi’s
technical competence - which has in turn become synonymous for Audi’s
technological leadership (Vorsprung durch Technik) on the racetrack and
the road alike.
Audi has scored innumerable wins on racing circuits all over the world.
After the successes achieved in rallying in the 1980s and many triumphs
with touring cars bearing the four-ring emblem, Audi’s commitment to
sports-car racing represented undoubtedly the greatest challenge faced
by its motor-sport engineers so far.
But here too the engineers mastered their task brilliantly: three times
in succession - in 2000, 2001 and 2002 (and indeed taking first, second
and third places in 2000 and 2002) - the Audi R8 cars were the first
across the finishing line of the Le Mans 24-Hours race.
Le Mans - without doubt the toughest task that the Audi Sport Team’s
engineers have ever tackled. For this particular event all the car’s
systems have to be laid out to survive a distance far greater than in a
short sprint event. This technological challenge includes - in addition
to the essentials of top performance and optimum driving dynamics -
endurance, reliability and perfect ergonomics.
These are virtues - and technologies - that can be translated with great
effect into a roadgoing sports car and which make the Audi Le Mans
quattro as unique as its thrilling design: the genes of a winner.
Even the first glimpse of the car gives
the observer a clear picture of its calibre. The Audi Le Mans quattro,
with its Jet Blue paint finish, has a wide stance and a bullish
appearance on the road. Its powerful rear end seems to be bracing its
muscles in order to jump, like a sprinter on the starting line.
The body makes a compact impression. The car’s front and the flat curve
of the roof outline seem to have been sketched with a single sweeping
stroke: a line that identifies the two-seater instantly as an Audi,
since together with the front curve of the front wings it recalls the
Audi TT and the Nuvolari quattro GT study.
Familiar contours at the sides too: both the dynamic, waisted line above
the sill and the shoulder line link the car’s front, sides and tail end
together; the doors and the transition to the side air inlet are
particularly well sculpted and emphasise the typical round Audi wheel
arches with large 20-inch wheels in an even more intensive way.
The windscreen seems to grow directly out of the short front section.
Its glass has been given a hydrophobic (water-repellent) coating - an
achievement derived from nano-technology - which is also highly
resistant to dirt. A similar micro-coating helps to reduce the
penetration of ultraviolet and infrared rays and prevent the interior
from heating up.
The Audi Le Mans quattro is a markedly ‘cab forward’ design, typical of
a mid-engined sports car and with visible echoes of the Audi R8. Behind
the occupant area but ahead of the rear axle is the V10 engine with its
twin turbochargers: a technical sculpture that is visible from the
inside of the car and also through a large, transparent rear flap.
1.90 metres wide but only 4.37 metres long and 1.25 metres high: those
are the proportions of a supersport model. The 2.65 m long wheelbase
accommodates a remarkably spacious occupant area and the longitudinally
installed engine behind it. To the rear of the doors, between the sill
and the roof, there is a large outward-curving intake that supplies the
V10 engine, the oil cooler, the charge-air intercooler and the brakes
with sufficient air.
The trapezoidal shape of the Audi ‘single-frame’ grille is a distinctive
feature of the front end, flanked on the right and left by additional
large air inlets. Their upper ends are flush with the flat-strip LED
headlights, which have clear-glass covers. The centre of the bonnet,
carrying the four-ring badge, continues the dynamic line of the low
central radiator grille typical of a sports car such as this.
It curves up above the line of the front wings, which spread out at the
sides over the large round wheel arches typical of an Audi.
LED - these three letters stand for “light-emitting diode” - a
technology with confirmed advantages, such as a tenfold reduction in
power consumption compared with conventional bulbs, but with a very much
longer operating life.
Nor is that all - the LED principle has even more potential for future
uses. In a later development stage, LED headlights will enable dynamic
cornering beams to be provided by a system that does not use any moving
parts. By switching additional LED elements on and off electronically,
the light beam can be varied in width and direction.
Another LED advantage is that the lighting elements take up less room
than conventional ones, so that the designers have more scope for
exercising their talent. The 17 cooled light sources on each side are
much closer to the transparent cover than is normally the case, and the
covers too are of reduced size, so that the entire front end of the car
looks more compact and tauter in its styling. The light-emitting diodes
for the flashing turn indicators separate the two LED blocks used for
the dipped and full headlight beams. The side turn indicator repeaters,
housed in the base of the outside mirrors, also use this new technology.
Seen from the side, the rear-end contours consists of an interplay of
concave and convex lines. Below the clearly defined spoiler lip is a
shallow, vertical surface framed at the sides by the rear light
assemblies, which also use LEDs. The light strip for the third brake
light runs across the entire width of the roof at the read end of the
transparent engine cover.
The base of the rear end in particular exposes certain technical
features of the Audi Le Mans quattro, among them the two central exhaust
tailpipes and two large diffuser openings that reveal the intensive
influence of aerodynamics on the car’s design.
Body aerodynamics were developed in Audi’s modern wind tunnel, in close
cooperation between Audi Design and Audi Sport. These two sections of
the Audi organisation have already worked on three generations of the
Audi R8 competition car, preparing it for road speeds of well over 300
km/h and optimising its aerodynamic downforce for fast, safe cornering -
technology transfer at the very highest level.
When the Audi Le Mans quattro is driven at a speed above 120 km/h, its
rear spoiler is extended automatically into the slipstream, to add to
the ‘negative lift’ generated by the aerodynamic design of the floor pan
and the diffusers. If the driver wishes to leave the spoiler extended
all the time, for instance when lapping a racing circuit, it can be
prevented from retracting at a button on the multifunctional steering
wheel. Otherwise it moves back in again flush with the body when the
Audi Le Mans quattro’s speed drops below 80 km/h. Incidentally, the
spoiler is also extended when the car is reversed, since it contains the
strip-pattern reversing lights.
This concept car is based on aluminium Audi Space Frame (ASF) structure
- the perfect blend of minimum weight and maximum rigidity as a
foundation for the highest standards of road dynamics.
The outer skin of the body and various add-on parts are of mixed
weight-saving construction, using aluminium and carbon-fibre reinforced
plastics. This is a precondition for the car’s low gross weight of only
1,530 kilograms and therefore for its outstandingly good power-to-weight
ratio of only 2.5 kg/bhp.
When the large covers are electrically released and opened, the
elaborate suspension elements and the wide tyres with their precision
tread pattern are revealed.
The systematically driver-oriented
architecture dominates the car’s interior. The driver can be regarded as
an integral element of a cockpit bordered by the fascia, a high centre
console and the instrument panel above it, which is angled towards the
Form follows function: the Audi Le Mans quattro pursues this approach
with great determination. In addition to the driver-oriented interior
architecture, which continues in the design of the door cappings, it is
the choice of materials that creates the functional atmosphere. A
critical look from the driving seat confirms that in this ‘driving
machine’ the design and positioning of all the elements have been
concentrated on essentials.
Even the contribution made by the colour scheme to the overall ambience
pursues the same aesthetic and ergonomic purpose: dark, ‘technical’
shades also create a visual link with motor sport, and the impression of
professional functionality and ergonomic efficiency is borne out by the
prominent use of top-quality materials and workmanship.
The footwells and footrests are fully painted to yield a surface finish
that is repeated inside the boot and the engine compartment as well.
Individual areas are clearly distinguished by the use of different
materials: the fascia, for instance, uses a high-grade semi-transparent
woven material with a network structure; this is also to be found on the
outside of the seat shells. For precision operation and to make them
pleasant to the touch, the controls are of rubber and aluminium.
A non-slip material with the appearance of Neoprene is used for the
shoulder area of the seat shells. These are hinged in the lumbar region
and have the seat cushions upholstered with a sporty and futuristic
high-tech weave. Four-point automatic-reel seat belts restrain the
wearer’s body effectively even at the high rates of retardation
encountered on the racing circuit.
The amount of space provided ensures a high standard of ride comfort for
the occupants - easily superior to what is normally available in a
high-performance sports car.
There are well-positioned storage shelves in the cockpit and removable
pouches behind the seat shells, which can be folded forwards. The front
luggage compartment has a volume of 100 litres, enough to accommodate
the weekend baggage of the car’s two occupants.
All the main sources of information are directly in front of the driver,
in the area behind the multifunctional sports steering wheel, the rim of
which is flattened at the bottom. The instrument cluster is divided into
three sections: the rectangular centre section flows in a droplet
pattern into the information units at the left and right.
Whereas the revolution counter at the left, although operated digitally,
has a classic circular dial, the interior designers have pursued an
entirely new path for the right section of the instrument cluster. The
large-format digital display uses the TFT technique and can be switched
between three modes - analogue, track and MMI - by the driver.
When cruising, and in the analogue mode, the surface becomes a digital
speedometer with an analogue display and an additional clock display.
Those who take the Le Mans quattro out on to the racing circuit can use
the track mode to display a plan of the circuit. Information obtained by
GPS is used to show the next bend and to compute the lap time. In
parallel with this, the almost square central section displays
information on the selected suspension settings and the gear in use.
The principal data on the engine’s operating condition, for instance oil
pressure and temperature, can be obtained in the MMI mode. For road use,
this is where the route guidance pictograms supplied by the navigation
system in the TFT display are shown.
The system is controlled from the MMI terminal, which is conveniently
located on the centre console - an operating concept that has already
proved convincing in the Audi A8 production car, thanks to its logically
Another well-proven feature is operation of the sequential-shift sports
gearbox by paddles behind the steering wheel. This ergonomic concept has
long since proved successful in motor sport - the best example of this
being the threefold Le Mans winner, the Audi R8.
The small-diameter sports steering wheel also resembles a racing-car
design. There are four switches below the central impact-absorbing hub:
one operates the spoiler, the next activates a ‘pit stop’ function. This
makes it much easier for the driver to comply with speed-limited zones.
The third of these easily reached and operated buttons adjusts the shock
absorber settings of the Audi magnetic ride system extremely rapidly.
The fourth and last steering wheel button activates the track mode in
A flow of power as if from a turbine, a
high maximum torque curve and a fascinating sound: the basic features of
a perfect sports-car engine. This 5.0-litre V10 engine with its twin
turbochargers is just as fascinating in the potential it offers as in
its suitability for day-to-day use. Its ‘bite’ in every operating range
and its unrivalled willingness to rev up to high speeds are truly
An included angle of 90 degrees between the engine’s cylinder banks
helps to keep the entire car’s centre of gravity low. It makes sensible
use of the available space and does not obstruct the driver’s view to
the rear. A crankshaft with offset crankpins is used to ensure supreme
refinement and a sporty sound.
This ten-cylinder engine has 40 valves, operated by four overhead
camshafts. Both the inlet and exhaust valves have continuously variable
opening periods to ensure optimum gas flow in all engine-speed ranges.
Two turbochargers driven from the exhaust and located behind the engine
boost the pressure of the combustion air to a maximum of 2.0 bar before
it is forced into the engine. The charge-air intercoolers are mounted
above the engine. They are fed with air through an inlet on the body
side and have an additional low-temperature cooling water circuit. The
two oil coolers are at the side of the engine, well positioned in the
airflow behind the side inlets.
As a result of these careful design measures, the engine can develop an
impressive 449 kW (610 bhp). A big contribution to this formidable
output is made by the direct petrol injection (FSI) system, which set
new standards in the cars that won such historic victories in the 2001
and 2002 Le Mans races and in the American Le Mans Series. FSI combines
outstandingly efficient power output with highly efficient combustion of
In the Audi Le Mans quattro the ten-cylinder biturbo FSI engine is
particularly pleasant on account of its willingness to rev freely and
its lusty pulling power at all engine speeds. The maximum torque of 750
Newton-metres is available within an exceptionally broad engine-speed
range from 1,750 to 5,800 rpm, so that unnecessarily frequent gear
changes are avoided. With these basic output and torque data, the five-litre
engine can catapult this two-seater car from a standstill to 100 km/h in
only 3.7 seconds and continues to accelerate it until the speedometer
needle reaches 200 km/h, which it does after a mere 10.8 seconds. The
theoretical top speed is 345 km/h, but this is electronically governed
to 250 km/h.
Despite this abundant flow of power, it is quite probable that the
driver of the Audi Le Mans quattro will choose to change gear quite
often at the manual selector paddles behind the steering wheel, since
gear changes take only a fraction of a second and there is no clutch
pedal to be operated. A short gear lever is mounted on the centre
tunnel, next to the electronic parking brake control, but is used only
to preselect the automatic, normal and sport modes and also to engage
Thanks to an electro-hydraulic system, the car can be driven away from a
standstill without a clutch pedal having to be operated. In this way,
the sequential-shift 6-speed gearbox offers the highest level of driver
convenience as well as the dynamic gear changes expected of a sports
car. The gear ratios are widely spaced, so that the driver always has
the ideal gear available to make controlled use of the engine’s
Such a powerful Audi car naturally features the quattro permanent
four-wheel drive system. The Le Mans quattro, as a leading-edge
technology carrier, has a version of this legendary driveline that has
been adapted to suit the car’s mid-engined layout and the associated
For optimal traction and dynamic road behaviour, the power from this
mid-engined sports car’s ten-cylinder engine is normally distributed in
a ratio of 40:60 between the front and rear axles. This achieves maximum
agility together with optimal traction - essentials for supreme road
dynamics in all conditions and on corners of varying radii.
This version of the quattro driveline, with Torsen C inter-axle
differential, is of course capable of diverting engine torque to the
axle at which there is more tyre grip available, in order to suppress
wheelspin. Depending on the amount of grip detected, torque distribution
between the front and rear axles can be varied continuously from 20 : 80
to 70 : 30 percent.
The suspension uses double wishbones at
front and rear; the upper and lower front wishbones are both
triangulated. At the rear, the upper wishbone is triangulated and the
lower one is of a trapezoidal pattern for optimal wheel location - a
geometry that has proved ideal for maximum steering precision and
precisely defined self-steering effects in motor sport.
Direct-action rack and pinion steering with the degree of power
assistance dependent on road speed reduces steering wheel effort while
ensuring an optimal level of feedback from the road.
The spring and shock absorber settings are firm, to ensure the highest
possible level of road dynamics, but the level of ride comfort that they
offer is none the less most remarkable. This is because the shock
absorbers feature an innovative technology known as ‘Audi magnetic
ride’. Instead of the conventional hydraulic fluid in the shock
absorber, it contains a ‘magneto-rheological’ fluid, the viscosity of
which can be varied by applying a magnetic field. The electronic control
system energises an electromagnet which can be used at any time to
influence the shock absorber’s operating characteristic.
In this way the most suitable level of damping can be provided in every
driving situation, for optimum ride quality and dynamic road behaviour.
A computer uses signals from sensors to detect the actual driving
situation within a few thousandths of a second. A switch is provided at
the steering wheel for the driver to choose between two driving
programmes, either an emphatically sporty one using the magneto-rheological
shock absorber fluid at low viscosity, or the alternative setting for
greater ride comfort.
The Audi Le Mans quattro has large-diameter, suitably impressive 20-inch
wheels with seven double-arm styling. Front tyres of size 255/30 , with
295/30 tyres at the rear, keep this potent car anchored firmly to the
road surface. These sizes also ensure that the dynamic talents of the
powertrain and running gear are translated into optimal grip and the
maximum possible lateral dynamic levels. And of course the design and
dimensions of these wheels add even more to the characteristically
sporty looks of the Audi Le Mans quattro.
The wheels are of the centre-lock type, with an absolute zero-play
connection between wheel hub and stub axle to ensure accurate wheel
location in all three dimensions and perfect dynamic balance. The wheel
retaining nut has a built-in freewheel to prevent it from unscrewing
accidentally - here too, technologies that had their origins in motor
Yet another high-tech feature adopted from motor sport: the brake discs
are made from a ceramic material. With diameters of 380 mm at the front
and 356 mm at the rear, they slow and stop the car in a manner that
matches its immense performance. Braking pressure is transmitted to
these discs by eight-piston fixed calipers at the front and fist-type
calipers at the rear.
The ceramic material used for the brake discs conducts heat away
excellently, withstands high temperatures very well and is therefore
exceptionally resistant to fading: a most desirable feature that will
enable the Audi Le Mans quattro to achieve the fast lap times of which
it is capable on the world’s racing circuits.