mclaren mercedes slr

here is the mean machine ................ to know abt this beast click on the link below

http://www.mbusa.com/microsite/slr/index.jsp

here are some pics of one of the best cars ever built

The Mercedes-Benz SLR McLaren is an Anglo-German sports car 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 e.g. the Aston Martin V12 Vanquish and Ferrari 599 GTB.[1]
It is the fastest automatic transmission car in the world. [2] SLR stands for "Sport, Leicht, Rennsport" (sport, light, racing). Mercedes-Benz has stated that they will build 3500 SLRs in a span of 7 years, with an annual production of only 500 cars.[3] The car's base price is GB£300,000 (approx. US$495,000 or €475,000, c. 2007).[4

History
The Mercedes-Benz SLR McLaren is inspired by the Mercedes-Benz 300 SLR of 1955, based on the W196 F1 car, yet named after the road-going 300SL Gullwing. On 4 April 2008, Mercedes announced they will cease production of the SLR. The last of the coupes rolled off the production line at the end of 2007 and the roadster version is due to be discontinued in early 2009.

[edit] 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 1200°C. The front discs are internally vented and 370 mm in diameter. 8 piston calipers are used. Rear discs are 360 mm in diameter with 4 piston calipers. During wet conditions the calipers automatically skim the surface of the disks to keep them dry.

Rear view of the SLR McLaren.
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 ~25%.

[edit] 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 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.

[edit] Engine

The SLR McLaren sports a hand-built 5.4-litre, supercharged V8 engine.
The SLR sports a 232-kilogram (512 lb), hand-built, 5.4-litre (5439 cc/331.9 cu in), supercharged, all-aluminum, 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 produces 0.9 bar (13 psi) of boost, the turbine rotates at 23000 revolutions per minute, and the air is cooled via two intercoolers. The engine generates a maximum power of 626 PS (617 hp/460 kW) at 6500 revolutions per minute and a maximum torque of 780 newton-metres (575 ft·lbf) at 3250 revolutions per minute. 2003 models were leaving showrooms at 616 bhp (459 kW/625 PS) and now are slightly increased to 626 bhp (467 kW/635 PS) .
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.

[edit] Performance

A Mercedes-Benz SLR in motion
McLaren's performance claims for the SLR have been confirmed. Depending on the source, the car accelerates from 0 to 100 km/h (62 mph) in approximately 3.1 seconds (see below), 0-200 km/h in 9.5 seconds, and 300 km/h (186 mph) in 24.4 seconds, and has a top speed of 360 km/h (224 mph). The car uses carbon fibre for its entire body construction to attempt keep the weight low. Despite CFRP materials the total curb weight is 1768 kg (3898 lb). The SLR is one of the safest[citation needed] and most luxurious[citation needed] cars of its class ever built, straying from the practice of eliminating luxuries for the sake of weight reduction.
Car and Driver achieved a 0-60 time of 3.8 seconds, and a quarter-mile time of 10.3 seconds at 230 km/h (143 mph) C&D suggests the times may be even lower if temperatures were lower. 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 0.98 g on the skidpad.
Road and Track tested the car in their July 2005 Road Test and reached 60 mph (100 km/h) from a standstill in 3.5 seconds. The 0-100 mph sprint was achieved in 7.5 seconds and a Quarter Mile run was completed in 11.5 seconds at 126 mph (203 km/h).
The German magazine Auto Motor und Sport, in 2004, tested the SLR at the Nardo test track in southern Italy. They reported that the SLR accelerates from 0 to 100 km/h (62 mph) in 3.2 seconds, 200 km/h (124 mph) in 9.5 seconds, and 300 km/h (186 mph) in 24.4 seconds. The car's 400-meter time and 1 km time were found to be 10.5 seconds at 228 km/h (142 mph), and 18.5 seconds at 310 km/h (193 mph), respectively. They also reached its claimed 360 km/h (224 mph) top speed.

[edit] Comparison
Despite its near 2-ton weight, the fuel economy is generally better than the lighter Lamborghini Murciélago, and even its lighter, less expensive, less powerful sibling, Gallardo.[5] Also, BBC auto show Top Gear put the SLR and the Porsche Carrera GT on its track, and the Porsche beat the SLR-McLaren by just over a second (1:19.8 vs. 1:20.9 [1]). However, on a separate race around the same track, the SLR was fractionally quicker than the Carrera GT. In a straight line, the SLR is quicker throughout the range.

[edit] 722 Edition

The Mercedes-Benz 722 Edition features some upgraded styling.
A new version was introduced in 2006 called the Mercedes-Benz SLR McLaren 722 Edition. The 722 refers to the victory by Stirling Moss and his co-driver Denis Jenkinson in a Mercedes-Benz 300 SLR with the starting number 722 (indicating a start time of 7:22 a.m.) at the Mille Miglia in 1955.
The "722 Edition" boosts power to 485 kW (650 hp) and 820 N·m (605 ft·lbf) torque at 4000 rpm, posting a top speed of 378 km/h (18 km/h faster than the standard SLR). 19-inch light-alloy wheels were used to reduce unsprung weight, while modifications were also made to the suspension, with a stiffer damper setup and 10 mm (0.4 in) lower ride height introduced for improved handling. Larger 390 mm diameter front brakes and a revised front air dam and rear diffuser were fitted.[6]
Overall performance has increased, with a claimed 0-100 km/h time of 3.2 seconds, 0-200 km/h time of 9.6 seconds and 0-300 km/h in 23.5 seconds. Exterior changes, other than the larger 19-inch black light-alloy wheels, include red 722 badging, hearkening back to the original 722 racer.

[edit] Roadster


A roadster version of the SLR has also been confirmed, due to go 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 bhp (467 kW), to propel it to a top speed of 360 km/h and enable a 0-62 mph (0-100 km/h) dash time of 3.2 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 124 mph (200 km/h) with the roof retracted. It is unsure if McLaren will release another version of the roadster like it did with the SLR 722 version. This roadster is aimed to compete against other sports cars such as the Pagani Zonda F Roadster.[7]

[edit] 722 GT

The SLR 722 GT test car on display.
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 inch OZ racing wheels. The front grill vents are removed and larger, freer 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 and reduced its dry weight to 1300 kg (2866 lb). The engine remains in relatively stock specification but now produces 500 kW (680 bhp) and 830 N·m (612 ft·lbf) 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. Only 21 examples of the 722 GT are planned to be made, all of which will be for racing use only. Each costs upward of €750,000

The engine has four valves per cylinder, for a total of 64 valves.
It has a dry sump lubrication system borrowed from Formula 1 race cars, along with an intricate internal oil path to ensure proper lubrication and cooling within the 16 cylinders.
It has electronically controlled, continuously variable cam timing to create optimal performance at different engine rpm settings.
It has a massive radiator to deal with all of the waste heat that burning 1.33 gallons of gasoline per minute can generate. Everything about the engine is superlative.
And it is remarkably compact. It measures just 710 mm (27 inches) long, 889 mm (35 inches) wide and 730 mm (28.7 inches) high. This is the beauty of Bugatti's W-16 approach -- the engineers managed to fit 1,000 hp into a reasonably sized package.

The TransmissionThe transmission is unique, in particular because it has to harness about twice as much torque as any previous sports-car transmission. It has:
Seven gears
A dual clutch system
Sequential shifting
A paddle-driven, computer-controlled shifting system This computer-controlled system is identical to the sort of system found in a Formula 1 car or a Champ car. There is no clutch pedal or shift lever for the driver to operate -- the computer controls the clutch disks as well as the actual shifting. The computer is able to shift gears in 0.2 seconds.
See Audi: Uninterrupted Power: Technical Details for more information on dual-clutch systems.
It would be almost impossible for all of the torque available from the W-16 engine to flow out to just two wheels without constant wheel-spin. Therefore, the Veyron has full-time all-wheel drive. By applying the engine's power to all four wheels through a computer-controlled traction-control system, the car is able to harness all of the engine's horsepower, even at full acceleration.
See Audi: Quattro for an explanation of the Quattro all-wheel drive system. See also How Differentials Work and How Four-Wheel Drive Works

The BodyAccording to one of the Veyron's designers, the biggest challenge in creating the Veyron was the aerodynamics. How do you keep a 250-mph passenger car on the road?
Photo courtesy Bugatti Automobiles S.A.S.
An F-1 car or a Champ car can travel at 250 mph or more, but they have a uniquely designed body, a single driver lying in a reclining position, just an inch or so of ground clearance and an aero-package made up of large wings to generate massive downforce. The Bugatti, on the other hand, is trying to look like a normal car and seat two passengers.
The Veyron's dimensions help to some extent. The car is 79 inches (200 cm) wide, 176 inches (447 cm) long and only 48 inches (122 cm) high. Keep in mind that a Hummer 2 is 81.2 inches wide. The Bugatti is extremely wide for its height.
Photo courtesy Bugatti Automobiles S.A.S.

The underside of the Veyron, like an F-1 car, is streamlined and venturi-shaped to increase downforce. There is also a wing in the back of the Veyron (see below) that extends automatically at high speed to increase downforce and keep the car glued to the road. According to Popular Science: Hypercar, "With the moving tail spoiler we've got enough downforce now, about 100 kg (221 pounds) at the rear and 80 kg (177 pounds) at the front at top speed."
Photo courtesy Bugatti Automobiles S.A.S.The Bugatti Veyron's tail wing creates downforce at high speeds.
Photo courtesy Bugatti Automobiles S.A.S.Engine and air snorkels
If you look at the above photo, you'll notice two snorkel-like devices, one on either side of the engine, on the roof of the car. The Veyron uses these to manage airflow. The Veyron has three reasons for managing airflow:
At maximum power, the engine is consuming 45,000 liters of air per minute.
At maximum power, the engine is burning 1.33 gallons of gasoline per minute and needs to dissipate all of that heat through its radiators.
When stopping, the brakes need to dissipate heat ?- especially important when rapidly accelerating and braking on twisty road courses. You can see how the Veyron handles these requirements in the photo below. The engine of the Veryon sits behind the driver, so roof-mounted snorkels, the rear-deck vents and side-mounted scoops bring air to the engine and rear brakes.
Photo courtesy Bugatti Automobiles S.A.S.
The size of the engine and transmission, along with the four-wheel-drive system and the four drive shafts, along with the opulence of the passenger compartment (discussed in the next section) and the car's oversized dimensions, all add weight. Even though the body is sculpted in carbon fiber to minimize its mass, the car weighs in at about 4,300 pounds (1,950 kg). For comparison, a Dodge Viper weighs about 1,000 pounds (454 kg) less.
In the next section we'll look at the tires and interior.

In order to harness all of this horsepower and torque, you need an amazing transmission...

Bugatti Veyron

How would you define the most amazing production car in the world? Would it be:
The car with the most horsepower?
The car with the fastest top speed and acceleration?
The most expensive car? At the moment, the Bugatti Veyron appears to have it all:
A W-16 engine that can produce 1,001 horsepower
A top speed of 250+ mph (400+ kph)
A zero-to-60 time of three seconds
A zero-to-180 time of 14 seconds
A price tag somewhere in the $1.2 million range.
In this article, we will take an in-depth look at this amazing automobile and see how it is possible to fit so much performance into a single machine. It all starts with the engine...
The Bugatti Veyron is a car built around an engine. Essentially, Bugatti made the decision to blow the doors off the supercar world by creating a 1,000-horsepower engine. Everything else follows from that resolution.

Here's a quick calculation, which you can ignore if you hate math:
1,000 horsepower is equivalent to roughly 2.6 billion joules per hour. A gallon (3.8 liters) of gasoline contains 132 million joules, so a 1,000-hp engine has to be able to burn just over 20 gallons of gasoline per hour.
However, car engines are only about one-quarter efficient -- three quarters of the gasoline's energy escapes as heat rather than as power to the wheels. So the engine actually has to be able to burn at least 80 gallons per hour, or 1.33 gallons (5 liters) per minute.
Let's convert over to metric. Gasoline requires about 14.7 kilograms of air to burn 1 kilogram of gas. Air weighs 1.222 kilograms per cubic meter at sea level. A gallon of gasoline weighs 2.84 kilograms. So the engine has to be able to process 2.84*1.33*14.7 kilograms of air per minute, or roughly 45 cubic meters of air per minute. That's 45,000 liters of air per minute.
If a V-8 engine is turning at 6,000 rpm, it can inhale a total of 24,000 cylinders' full of air per minute. If it needs to inhale 45,000 liters of air per minute, it works out to roughly 2 liters per cylinder-full. That's a 16-liter engine.

We need a 16-liter engine to burn 1.33 gallons of gas per minute. That actually makes sense -- the engine in the Dodge Viper is 8.0 liters in displacement and produces 500 hp.
But there's a problem: A 16-liter V-8 engine would be very large. And the pistons would be massive, so there would be no way it could turn at 6,000 rotations per minute (rpm). It might turn at a maximum of 2,000 rpm, meaning that you would need an immense 48-liter engine to generate 1,000 hp. Clearly an engine that big is impossible in a passenger car.
Photo courtesy Bugatti Automobiles S.A.S.Caption -->
So how did Bugatti fit 1,000 horsepower into a passenger car? Let's find out.

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