The Mercedes-Benz SLR McLaren is a grand tourer car jointly developed
When it was developed, German manufacturer Mercedes-Benz
owned 40 percent of the McLaren Group.
Due to the automatic gear box, front mid-engined arrangement,
and its driving characteristics, some commentators classify the SLR McLaren as a GT,
whose rivals would be vehicles such as the Aston Martin DBS V12 and Ferrari 599 GTB Fiorano.
SLR stands for "Sport Leicht Rennsport" (Sport Light Racing). Mercedes-Benz stated that they would build 3,500 SLRs over seven years, with an annual production of 500 cars.
History
The Mercedes-Benz SLR McLaren was inspired by the
which was a modified Mercedes-Benz W196 F1 race car.
It was introduced on 17 November 2003. On 4 April 2008,
Mercedes announced that they would cease production of the SLR.
The last of the coupes rolled off the production line at the end of 2009
and the roadster version was discontinued in early 2010.
Technical highlights
Brakes
The brake discs are carbon-ceramic and provide better stopping
power and fade resistance than steel discs when operating under
ideal working temperature.
Mercedes-Benz claims these discs are fade resistant to 1,200 °C (2,200 °F).
The front discs are internally vented and 370 mm (15 in)
diameter eight-piston callipers are used.
Rear discs are 360 mm (14 in) in diameter with four-piston callipers.
During wet conditions the callipers automatically skim
the surface of the discs to keep them dry.
Aerodynamics
The SLR features active aerodynamics; there is a spoiler mounted
on the rear integral air brake flap.
The spoiler increases downforce depending on
its angle of elevation (angle of attack).
At a set speed, the spoiler/brake automatically raises
to 10 degrees (15 degrees in the 722 edition),
when demanded via the driver's switch, the elevation
can be increased to 30 degrees (35 degrees in the 722 version)
for increased rear downforce, at the cost of increased steady state drag.
Engine
The SLR sports a 232 kg (511 lb) hand-built 5,439 cc (5.439 L; 331.9 cu in),
The cylinders are angled at 90 degrees with three valves per cylinder
and lubricated via a dry sump system.
The compression ratio is 8.8:1 and the bore and
stroke is 97 mm × 92 mm (3.8 in × 3.6 in).
The Lysholm-type twin-screw supercharger rotates
at 23,000 rpm and produces 0.9 bar (13 psi) of boost.
The compressed air is then cooled via two intercoolers.
The engine generates a maximum power of 626 PS (460 kW; 617 hp)
at 6,500 rpm and maximum torque of 780 N·m (580 lb·ft) at 3,250 to 5,000 rpm.
The engine is front-mid mounted. McLaren took the original concept
car designed by Mercedes and moved the engine 1 metre (39.4 in)
behind the front bumper, and around 50 centimetres (19.7 in)
behind the front axle. They also optimised the design of the centre firewall.
Transmission
The SLR uses AMG SPEEDSHIFT R five-speed automatic
transmission with three manual modes.
For durability Mercedes selected a five-speed transmission
rather than their seven-speed gearbox which was more complex and used more parts.
Perform
The car uses carbon fibre reinforced plastics (CFRP) construction
in an attempt to keep the weight low.
Despite CFRP materials the total curb weight is 1,750 kg (3,858 lb).
Car and Driver achieved a 0 to 60 mph (97 km/h) time of 3.4 seconds,
and a quarter-mile time of 11.2 seconds at 130 mph (210 km/h)
C&D suggests the times may be even lower if temperatures were lower.
Motor Trend tested the SLR and achieved a 0-60 mph
time of 3.3 seconds in April 2006.
Car and Driver achieved top gear
acceleration 30-50 mph and 50-70 mph times of 1.7 and 2.4 seconds,
which are the fastest ever recorded by the magazine in a production car.
The SLR also pulled 1.13 g on the skidpad.
Road and Track tested the car in their July 2005 Road Test
and reached 60 mph (97 km/h) from a standstill in 3.5 seconds.
The 0 to 100 mph (160 km/h) sprint was achieved in 7.5 seconds
and a quarter mile run was completed in 11.5 seconds at 126 mph (203 km/h).
http://en.wikipedia.org/wiki/Mercedes-Benz_SLR_McLaren
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