The Mercedes-Benz SLR McLaren is an Anglo-German supercar jointly developed by Mercedes-Benz and McLaren Automotive, built in Portsmouth and the McLaren Technology Centre in Woking, Surrey, England. Daimler AG, owner of Mercedes-Benz, also owns 40% of the McLaren Group.
Due to the presence of the automatic gear box, front mid-engined arrangement and its driving characteristics lead some commentators to classify the SLR McLaren as a GT whose rivals can be considered to be vehicles like the Aston Martin DBS V12 and Ferrari 599 GTB Fiorano.
Brakes
The SLR features Sensotronic, a type of brake-by-wire system. The brake discs are carbon-ceramic (in the front only) 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) in diameter. 8 piston calipers are used. Rear discs are 360 mm (14 in) in diameter with 4 piston calipers. During wet conditions the calipers automatically skim the surface of the discs to keep them dry.
To improve braking performance there is an automatic air brake, when engaged the rear elevation angle of the rear spoiler is set to 65 degrees. The additional rear downforce in addition to the markedly increased aerodynamic drag increases peak deceleration ~90%.
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 speeds above 95 km/h (59 mph) the spoiler/brake automatically raises to 10 degrees (15 in 722 edition), when demanded via the driver's switch, the elevation can be increased to 30 degrees (35 in 722 version) for increased rear downforce, at the cost of increased steady state drag.
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Engine Technology
The SLR sports a 232 kg (510 lb) hand-built 5,439 cc (5.439 L; 331.9 cu in), supercharged, all-aluminium, SOHC V8 engine. 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 millimetre (3.82 in) and 92 millimeters (3.62 in), respectively. The Lysholm-type twin-screw supercharger rotates at 23000 revolutions per minute 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)@6500rpm and maximum torque of 780 N·m (580 lb·ft)@3250-5000rpm
Unlike most of its contemporaries, its 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 optimized the design of the center firewall.
The SLR 722 can go from 0 to 100 km/h (62 mph) in 3.6 seconds, 200 km/h (120 mph) in 10.2 seconds and 300 km/h (190 mph) in 21.4 seconds and can reach a top speed of 337 km/h (209 mph).
Roadster
2008 Mercedes-Benz SLR McLaren roadster
A roadster version of the SLR went on sale in September 2007 for £350,000 ($711,065 U.S.). It uses the same supercharged V8 AMG power plant as its coupé siblings, developing 626 PS (460 kW; 617 hp), to propel it to a top speed of 332 km/h (206 mph) and enable 0-100 km/h (62 mph) acceleration time of 3.8 seconds.
However, being a convertible the roadster will have to be burdened with extra weight and this will affect performance and handling. The Roadster's roof, however, is made from a "newly developed material" and hence will not take the form of a folding metal arrangement, as is now common on many modern cars. Following a manual unlatching, it takes a mere 10 seconds to fold away electrically. According to an official document from Mercedes, the cabin of the roadster is capable of allowing conversation between driver and passenger up to a speed of 200 km/h (120 mph) with the roof retracted. This roadster is aimed to compete against other sports cars such as the Pagani Zonda F Roadster.
722 GT (2007-)
One of 21 SLR 722 GTs at the Goodwood Festival of Speed.
The 722 GT is a tuned version of the SLR 722 which is developed for a one-make racing series. The cars are built by Ray Mallock Ltd. with approval from Mercedes-Benz. The car features new wider bodywork to accommodate 19 in (482.6 mm) OZ racing wheels. The front grill vents are removed and larger, free flowing air extractors sit on the hood and flank the side of the car. The rear now has a racing wing and diffuser.
Under the body, the car has shed 398 kg (880 lb) and reduced its dry weight to 1,300 kg (2,900 lb) . The engine remains in relatively stock specification but now produces 680 PS (500 kW; 670 hp) and 830 N·m (610 lb·ft) at 1.75 bar (175 kPa) boost. Inside, the car is stripped out with only the essential functions being controlled from a carbon fiber binnacle. New carbon fiber door panels and full roll cage complete the transformation.
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Stirling Moss (2009-)
The SLR Stirling Moss is a limited (75 vehicles) edition of the series, which uses a speedster styling that does not include roof or windscreen. The design is based on the Mercedes-Benz 300 SLR race car. It is the last series of the McLaren SLR built under the partnership between Mercedes-Benz and McLaren.
The supercharged V8 engine is rated 650 PS (480 kW; 640 hp). The car's top speed is 350 km/h (220 mph) with acceleration from 0-100 km/h under 3.5 seconds. The car is approximately 200 kg (440 lb) lighter than the regular model.
Mercedes SLR
Incidentally, the two arms Mercedes 300 SLR went with a unique "air brakes" - the first will actively aerodynamic device in the history of car racing. The driver was back shield covering 0.7 m3, which is under braking opened with hydraulic drive towards airflow. At the speed of 250 kilometres per hour and it has a braking effect, reaching 42% of the efforts of the wheel brakes. In addition, "air brake" rear axle load increased, which further increased the intensity of braking.
Mercedes Benz Slr interior
SLR 2003 model year is different in appearance from his predecessor, and is internally. Unique in style, materials, and the most advanced technology to build a car pastors, many years of research and testing. To reduce weight in the construction of Mercedes-Benz SLR McLaren widely used aluminum.
V8 engine
Technical equipment new supporting is a familiar model Mercedes SL 55 AMG forced 5,3-litre turbo motor V8, developed with the help of AMG capacity equal to 626 horsepower and maximum torque of 780Nm is achieved at 3250 revolutions per minute. It remained at that level until 5000 before the failure of revolutions. Engine lubrication system was dry heat, more productive SCR, and other interesting solutions specialists' formula 'team McLaren. From zero to one hundred kilometres per hour and car for 3,9- second much more quickly, and up to 200 km / h in 10.6 seconds. Maximum speed car is 334 kilometres per hour. This design, in fact, may be more. In addition, 3-valve technology and four metal catalytic super power units monitor the stringent environmental standards for Euro-4, which takes effect in 2005.
Available in a five-engine "automatic", which, in addition to the basic mode of operation is three - "Sport", "Supersport" and "Race". These regimes are different speeds of transmission and the algorithm work.
In addition, the Mercedes SLR can compete as electric hydraulic braking system (SBS), in which the ceramic brake discs, as well as a sophisticated stability control system. Furthermore, the gadget is fitted with a set of airbags, which includes even the cushion to protect the legs passengers on impact, and other security systems. Incidentally, the design of car pastors of Mercedes applied technology and materials to protect cabins in the accident, used to Formuly-1 Cup. The basic version Mercedes SLR will be staffed 18-dyuymovymi wheels with 245/40 tires in front and size 295/35 at the rear. Inch wheels can be ordered as an option.
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