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Mercedes-AMG has developed an uncompromisingly sporty SLK 55 AMG for an Asian
investor. The two-seater includes suspension, brakes and a cooling system that
have been specifically tuned for the planned “AMG Ultimate Experience Asia”
lifestyle event; plus numerous lightweight construction features which provide
exhilarating handling dynamics. The design of the 265-kW/360-hp eight-cylinder
roadster is based on the SLK 55 AMG safety car, which ensured maximum safety
throughout the 2004 and 2005 Formula 1 seasons.
The “AMG Ultimate Experience Asia” is an exclusive series of
lifestyle-oriented events, aimed specifically at sports car enthusiasts in the
Far East. Everyone from individuals enamoured with motorsport to clients of
large corporations will be able to compete at the wheel of the 35 uncompromising
AMG sports cars at ten events that are being staged by an Asian investor in
countries such as China, Indonesia and Thailand. The series of lifestyle events
is due to get underway at the Formula 1 Grand Prix in Sepang/Malaysia (March 17
- 19, 2006). Mercedes-AMG plans to launch a limited-edition road-going model
based on the SLK 55 “AMG Ultimate Experience Asia” in the near future. The
custom-designed AMG vehicles are not registered for road use so far and will
only be driven on private racing tracks. However, the sale of these vehicles has
prompted AMG to meet the numerous demands for purist-oriented high-performance
cars.
The most striking aspect of the SLK 55 “AMG Ultimate Experience Asia” is its
hardtop made from carbon-fibre composite (CFRP), a high-tech material commonly
used in Formula 1 and the German Touring Car Championship (DTM). The unpainted,
silk matt black roof with its visible carbon-fibre structure is a highly
attractive feature that appears to change colours, depending on which angle it
is viewed from and how the light strikes it. This special SLK 55 AMG also
provides visual clues to its motor racing genes with, for example, new 19-inch
AMG forged light-alloy wheels featuring multi-spoke styling.
Lightweight construction for further-enhanced handling dynamics
Around 25 kilograms have been saved simply by using the carbon-fibre roof
with its plastic rear window and dispensing with the vario-roof mechanical and
hy-draulic systems. These measures lower the vehicle's centre of gravity,
helping to improve handling dynamics thanks to reduced body pitch and roll
combined with higher cornering speeds. Additional lightweight construction
measures – includ-ing forged wheels, an optimised AMG sports exhaust system,
leaving out insulat-ing materials, fitting lighter door linings as well as a
fibreglass-reinforced plastic bucket seat – compensate for the extra weight of
the braking system, the larger 80-litre racing tank, the roll cage and the fire
extinguishing system. The kerb weight of the SLK 55 “AMG Ultimate Experience
Asia” is considerably less than 1500 kg.
Transfer from motor racing: suspension, wheels and brakes from the safety
car
The suspension, wheels and braking system on the uncompromising SLK-Class are
based on the safety car: for instance the set-up with firmer spring/damper
tuning and harder torque strut bearings at the front axle is essentially the
same as that used for the 2004/2005 official Formula 1 safety car. The
wheel/tyre combination with 235/35 R 19 (front) and 265/30 R 19 (rear) tyres was
likewise taken from this car. The ultra-light 19-inch AMG light-alloy wheels
produced using sophisticated forging technology are new. Each wheel weighs
around a third less than a conventional cast-aluminium wheel.
Another feature the “Ultimate Experience” shares with the safety car is the
braking system: 360 x 22-millimetre composite brake discs with six-piston fixed
callipers and special racing brake pads provide the deceleration at the front
axle. Thanks to the innovative composite design with a grey cast iron brake disc
connected to an aluminium bowl, peak temperatures can be avoided extremely
effectively, giving the brakes outstanding fade resistance in harsh
racing-circuit conditions. 330 x 26-millimetre steel brake discs with
four-piston brake callipers are used at the rear axle. All the discs are
internally ventilated and perforated; the front brakes, which have to deal with
particularly high stresses, have specially designed cooling ducts – yet more
technology adopted from motor racing.
AMG 5.5-litre V8 engine with an output of 265 kW/360 hp and a new sports
exhaust system
The AMG 5.5-litre V8 engine developing 265 kW/360 hp and 510 Nm has been
lifted straight from the standard-production car. Modified especially for the
racing circuit, the AMG sports exhaust system with two twin chromed tailpipes at
the rear provides a more dramatic sound experience at the racetrack. An
auxiliary engine oil cooler has been integrated in the new-look AMG front apron;
another engine oil cooler (right) and a transmission oil cooler (left) have
replaced the standard-fit fog lamps. Side openings allow the warm air to be
dissipated effectively. A more powerful cooling system for the power-steering
oil pump and an active cooling system for the rear axle differential have also
been added. These measures ensure trouble-free operating temperatures whatever
the weather conditions. The transmission control system has also been specially
configured for the racetrack: for example, the gears can be shifted entirely
using a manual mode. There are two manual modes available – “M1”, and “M2” which
allows even faster gear changes. Steering-wheel gear-shift paddles, now the norm
in motor racing, have also been fitted.
Optimised weight distribution for superlative handling on the racetrack
Optimised weight distribution is another decisive factor in producing
handling on a par with a racing car: by moving the battery from the engine
compartment to the boot and fitting an 80-litre racing tank in the boot, the
weight has been distributed almost perfectly between the front and rear axle (52
to 48 percent). The racing tank with its typical foam inserts also prevents fuel
from sloshing from one side to the other – the ideal set-up for minimum body
movements on fast S-shaped bends. The dominant note in the interior is the
practical look and feel of a racing car: the fibreglass-reinforced plastic (FRP)
bucket seat with a six-point belt and fireproof fabric cover provides optimum
lateral support whilst the roll cage and the fire extinguishing system ensure
optimum safety.
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