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The Mercedes-Benz SLR McLaren is an impressive testament to the competence an_d experience of Mercedes-Benz an_d our Formula 1 partner McLaren in the development an_d production of high-performance sports cars. The two-seater, with its striking swing-wing doors an_d styling elements borrowed from the Formula 1 Silver Arrows, builds on the legacy of the famous SLR race cars of the 1950s. Equipped with cutting-edge race car technology an_d ground-breaking new Mercedes developments, designed to ensure a high stan_dard of safety an_d suitability for day-to-day use, the new Mercedes-Benz SLR McLaren creates a distinctive image for itself as a 21st-century Gran Turismo - a thrilling synthesis of tradition an_d innovation.

The newly developed V8 supercharged engine delivers an output of 460 kW/626 hp an_d accelerates the sports car from 0 to 100 km/h in 3.8 seconds. The top speed is approximately 334 km/h. The body of the Mercedes-Benz SLR McLaren, lik_e those of the Mercedes-McLaren Formula 1 race cars, is made from carbon fibre composites - lightweight materials which demonstrate exemplary energy absorption, hence ensuring the highest stan_dard of occupant protection. The SLR is the worlds first series-produced car to have a front crash structure manufactured entirely from carbon fibres. Adaptive airbags, newly developed kneebags an_d sidebags, belt tensioners, high-performance ceramic brake discs an_d an automatically adaptive airbrake in the boot lid round off the range of safety equipment on board the Mercedes-Benz SLR McLaren, setting new stan_dards in this vehicle class.

2004 Mercedes-Benz SLR McLaren

Technology way ahead of its time an_d an abundance of power - these were the hall-marks of the legendary SLR race cars in which Fangio, Moss, Kling an_d other Mercedes drivers achieved spectacular victories in all of the major road races in 1955. The Mercedes-Benz SLR McLaren demonstrates the same characteristics, its groundbreaking technical innovations distinguishing it as the Mercedes-Benz among high-performance sports cars.

Two longitudinal members made from carbon fibre composite absorb energy in a head-on collision

The 21st-century Gran Turismo is made almost entirely from carbon fibre composite. This lightweight yet extremely rigid material originated in the aeronautical an_d space industries an_d has also proven its benefits in todays Formula 1 race cars. The weight advantage of the high-tech material over steel is around 50 percent, an_d the carbon fibres, on impact, are characterised by four to five times higher energy absorption than steel or aluminium. Mercedes-Benz exploits these qualities by incorporating two 620-millimetre longitudinal members made from carbon fibre in the front structure of the Mercedes-Benz SLR McLaren. These absorb the entire energy of the crash in a defined head-on collision, leaving the passenger cell largely undamaged. It is also made entirely from carbon fibre composite an_d therefore offers a very safe survival zone in side-on or rear-end collisions too.

Mercedes-Benz has introduced new material technology to the manufacture of the brake discs too. They are made from fibre-reinforced ceramic an_d are characterised by high fade-resistance an_d a very long life. In collaboration with the electrohydraulic braking system, Sensotronic Brake Control (SMC™), they allow outstan_ding deceleration figures too, impressively underlining the motor racing heritage of the Mercedes-Benz SLR McLaren.

460-kW/626-hp V8 powerplant with cutting-edge compressor technology

In the interests of optimum dynamic han_dling an_d high stability on braking, the new Mercedes-Benz SLR McLaren has a front mid-engined design. The high-performance V8 engine, mounted on a robust aluminium frame, is installed at a low level which allows a low centre of gravity for agile han_dling.

With its 5.5-litre displacement, the supercharged engine develops a peak output of 460 kW/626 hp an_d delivers its maximum torque of 780 Newtonmetres from 3250 rpm - a figure which remains constant across a broad engine speed range of up to 5000 rpm. This means that the SLR 8-cylinder is among the most powerful engines currently available in a series-produced roadgoing sports car. This high-performance car takes just 3.8 seconds to sprint from 0 to 100 km/h, it passes the 200 km/h mark after 10.6 seconds, an_d from a stan_ding start it takes just 28.8 seconds to reach 300 km/h. The top speed is 334 km/h.

Water-type charge-air cooling, dry sump lubrication an_d four metal catalytic converters are further special features of this powerful engine - an engine which already meets stringent EU 4 exhaust gas regulations which are not due to come into force until 2005.

The 5-speed automatic transmission, fitted as stan_dard, is also designed for high performance. It allows the driver to choose between three programs with different shift characteristics. When "Manual" is selec_ted, the five gears can either be shifted using buttons on the steering wheel or using the selec_tor levers Touchshift function. In this mode the driver can also selec_t between three shift stages - "Sport", "SuperSport" an_d "Race" - significantly shortening the shift times still further for an even sportier drive.

Aerodynamic concept uses expertise from the world of Formula 1

The body design of the Gran Turismo with the Mercedes star takes classical styling elements from the legendary SLR race cars of the 1950s an_d blends them masterfully with the sophisticated, avantgarde design language of both the latest Mercedes passenger car models an_d of the modern-day Silver Arrow race cars which took the McLaren Mercedes team to Formula 1 World Championship glory in 1998 an_d 1999. The designs concept, in other words, thrillingly spans the divide between past an_d present, whilst at the same time showing the way forward for the sports car designs of tomorrow.

In order to meet the highest of stan_dards in terms of han_dling at top speed, directional stability an_d the cooling air requirements necessary for high-performance cars of this kind, Mercedes-Benz worked with McLaren on developing this models superlative aerodynamics, ensuring exemplary roadholding plus the on-road safety stan_dards typical of Mercedes. Following extensive wind-tunnel tests, the Mercedes-Benz SLR McLaren was given a virtually smooth underbody with a special six-channel diffusor under the rear. Both features are familiar design principles from Formula 1. They ensure that the airflow beneath the vehicle is virtually unimpeded an_d that negative lift, or downforce, is produced at higher speeds. The distinctive sidepipes on each side of the vehicle are also the result of this high-performance sports cars aerodynamic underbody concept: a conventional exhaust gas system would have disrupted the smooth line of the underbody.

At the rear of the Mercedes-Benz SLR McLaren an adaptive spoiler provides additional downforce. From a speed of 95 km/h, it automatically adopts a 10-degree position, increasing the contact pressure at the rear axle. The spoiler also doubles as an airbrake: when the driver brakes heavily, it rises to an angle of 65 degrees, not only ensuring increased aerodynamic drag but also shifting the aerodynamic centre further towards the rear. This lends the Mercedes-Benz SLR McLaren excellent stability when braking from high speeds.

Functionality an_d luxury stylishly combined

It is the very high levels of practicality an_d luxury that truly make the interior of the Mercedes-Benz SLR McLaren stan_d out. Individually padded carbon-frame seats, a multifunction steering wheel with race-car-type buttons for manual gear selec_tion, clearly arranged chronometer-style instruments an_d high-grade materials define the atmosphere inside the high-performance sports car.

Alongside carbon an_d aluminium, the Mercedes designers have used "Silver Arrow" leather, specially developed for the Mercedes-Benz SLR McLaren, which is available in the distinctive red of the legendary 1950s SLR race car.

Design: Spanning the divide between the past, the present an_d the future

Legend an_d innovation — this is the precept underpinning the body design of the new Mercedes-Benz SLR McLaren, as it takes the classical styling elements from the legendary SLR racing cars of the 1950s an_d blends them masterfully with the sophisticated, avant-garde design language of both the latest Mercedes passenger car models an_d of the modern-day Silver Arrows race cars with which the McLaren Mercedes team competes in the Formula 1 World Championship.

The designs concept therefore spans the divide between past an_d present an_d cre-ates a car with a unique charisma - a Mercedes synthesis of legend an_d innovation which is impressive in every respect.

It is the front end in particular which singles out the new Mercedes-Benz SLR McLaren as a direct descendent of the racing cars which have been so successful in recent times: the centre is dominated by the distinguishing, arrow-shaped nose of the Formula 1 Silver Arrow, encompassing the Mercedes star at the front, an unmistakable hallmark of manufacturing origins that are steeped in tradition.

Underneath the nose can be found a further typical styling element taken from the Formula 1 race cars which took McLaren Mercedes to the World Championship crown in 1998 an_d 1999: the twin-fin front spoiler with the distinctively curved struts. As on the Silver Arrows, these aerofoil fins are more than just a stylish identifying feature, they are actually crucial to the cars aerodynamics. The high contact pres-sure they produce at the front axle plays a key role in the Mercedes-Benz SLR McLarens sure-footed, race-car-lik_e roadholding.

The fin design was adopted as a recurring feature of the Mercedes-Benz SLR McLarens exterior, thereby main-taining a high level of design consistency: finned sections also separate the head-lamps from the nose, form the base for the two exterior mirrors an_d adorn the tail lights on each side of the car, where the indicators LEDs are housed in two self-supporting fins positioned one above the other.

Mercedes design breeding: twin-headlamp face forms identifying feature

Above the generously proportioned air intake for the engine cooling is the wide, flat bonnet, whose rear edge lies below the starting point of the A-pillars, permitting the deep-set design of the front windscreen. This is another typical element taken from the world of motorsport which gives drivers the good level of visibility needed for high-speed motoring.

The headlamp arrangement is a refreshingly new version of the highly familiar an_d equally successful twin-headlamp face, which has been the calling card of Mercedes-Benz passenger cars since 1995. In this SLR-style reinterpretation, al-though the dipped-beam an_d main-beam headlamps form a single unit, they never-theless succeed in emphasising their basic, pronouncedly oval form. The design team has reinforced the powerful visual effect by sheathing the powerful projection head-lamps in casings which resemble high-quality camera lenses, all housed behind clear glass.

As with all current Mercedes passenger cars, the oval lines of the twin-headlamp face form the starting points for modelling the bonnet an_d the wings. The rounded contours of the headlamps develop into powerful domed curves which quite deliberately evoke associations with the human anatomy: the curves extend back over the wings lik_e the sinewy muscles of a trained athlete, leaving no doubt in anyones mind that this car bristles with the pure power of a sporting superstar.

These contours — soft yet brimming with power an_d dynamism — combine with taut lines to produce a fascinating, sculpted exterior form, a clear expression of the uncompromising manner in which this cars high-performance credentials have been honed. The car flexes its muscles visibly but without any hint of aggression, with each fibre of its lithe body trimmed an_d tensed, ready to launch forward at any time.

The domed curves leading off from the inner pair of headlamps sweep seamlessly all the way back to the A-pillars, forming a smooth visual link between the front end an_d the passenger compartment. As they run up the long bonnet, the softly rounded domes again transform into taut, clean-cut lines, which in turn mould the appearance of the A-pillars an_d the side profile. This is also one of the elements underpinning the characteristic, powerful proportioning of the SLR silhouette: the long bonnet, taut midriff, compact passenger compartment an_d short tail create a deliberate association between the flow of the SLRs lines an_d the styling elements of Mercedes sports cars from years gone by, an_d symbolise the sense of forwards surge that courses through the Mercedes-Benz SLR McLaren.

The high-performance sports car exudes the same powerful, yet harmonious impression when seen from the rear too. This is down to the elegant way in which the lines flow from the passenger compartment into the lid of the boot, helped by the slender roof pillars which taper towards the bottom. Unlik_e the SLR Silver Arrows of the 1950s, whose tail curved gently downwards, the boot of the Mercedes-Benz SLR McLaren continues at the same high level in order to enhance the aerodynamic qualities.

The large tail lights are an immediate eye-catcher. The distinctive, triangular form of the transparent lenses, a typical feature of Mercedes passenger cars, has a wrap-around design which extends far into the side panelling to emphasise the width of the body.

Side gills an_d wide-opening swing-wing doors

It is above all the side profile of the high-performance sports car that identifies it as a car whose maker has a long an_d illustrious motor-racing tradition, with large, finned air openings breathing new life into the SLR legend. These "gills" are far more than a mere styling touch, serving now as they did back then to ventilate the engine compartment. The designers of the Mercedes-Benz SLR McLaren have lent further emphasis to this particular function by enlarging the surface of the fins towards the rear of the gills, an_d by placing a clean-cut line at the end of the fins which then sweeps further backwards to add to the styling of the swing-wing doors.

If there is one distinctive feature that the new Gran Turismo has adopted from the Uhlenhaut Coupé, the coupé version of the legendary SLR race car, designed in 1955 by Mercedes head of testing at that time, Rudolf Uhlenhaut, it is the doors.

In their modern interpretation, however, they are attached to the front roof pillars rather than to the roof itself an_d swing forwards an_d upwards in a wide angle. No less sensational than the gullwing design from the 1950s, this new concept also enlarges the entrance to the vehicle to make getting in an_d out easy for both driver an_d passenger.

Functionality an_d an inspiring look define the interior design

Inside, every detail of the interior reflects the high-performance character of the Mercedes-Benz SLR McLaren. Take your place on board, an_d youll feel the thrill of sitting in a thoroughbred sports car. The on-board atmosphere, however, is also one of safety an_d calm - key requirements where concentrated, fast driving is concerned.

The reason behind this is a straightforward yet very emotional design language. It takes up the fin design an_d continues it consistently in the interior. Here the typical SLR fins are reflected in the ventilation outlets, the airbags an_d the instruments. The profiles appear light an_d delicate, deliberately reducing the cockpit to the bare essentials, in keeping with motor racing philosophy. The design deliberately concentrates on the essential factor: the dynamic driving experience.

The focal point of the interior is undoubtedly the centre console with its high-grade aluminium trim. A visual extension of the distinctively shaped Formula 1 domes on the bonnet, the centre console serves as the transition between exterior an_d interior, whilst also picking up the powerful lines of the front-end design before they flow backwards over the transmission tunnel to the tail of the SLR. In order not to disrupt this clear-cut look, the radio an_d navigation system are inconspicuously housed below a cover in the centre console which opens in an elegant arc when pressed lightly. The instrument cluster surround also reinforces the impression of power. The two tubes appear to plunge into the bonnet, forming a visual link with the Gran Turismos power source. Clearly designed, circular instruments are centrally located in these tubes an_d perfectly positioned in the drivers field of vision.

The design of the instruments is based on the look of a high-quality chronometer. The large dials are inscribed with letters specially developed for the Mercedes-Benz SLR McLaren. The rather stark appearance conceals the latest display technology.

Despite its motor racing character, the interior of the Mercedes-Benz SLR McLaren also has a high-quality, in-viting feel. This is thanks to the stimulating interplay of selec_t materials. Aluminium an_d carbon contrast with supple "Silver Arrow" leather, which was specially devel-oped for the new high-performance sports car an_d sets peerless stan_dards in terms of its quality an_d material thickness. 20 different appointments colours are available to choose from, including the same bold shade of red which set new trends back in the 1950s when it was featured in those legendary, unforgettable sports cars, the SL an_d the SLR: the result is automotive tradition you can truly feel. A two-tone interior concept ensures both high functionality an_d an exquisite on-board atmosphere. In many areas the various materials are combined to create visual islan_ds. A fine, haematite-coloured frame, for example, embedded in sumptuous leather, surrounds the aluminium centre console.

Interior: Harmony of forms an_d materials

The combination of luxurious appointments an_d a stark sports car-style feel creates a uniquely spellbinding atmosphere on board the Mercedes-Benz SLR McLaren. Exclusive, soft "Silver Arrow" leather, specially developed for the SLR, an_d selec_t materials such as aluminium an_d carbon contrast strikingly with the pure functionality of a ve-hicle whose roots lie in the world of motor racing. In the interior, as in the exterior, the motor racing heritage is combined with the clear advantages of a classic Gran Turismo: outstan_ding ride comfort an_d a deliberate concentration on the pleasures of refined dynamic driving.

Despite its focus on luxury an_d comfort, the Mercedes-Benz SLR McLarens interior dimensions are clearly those of a high-performance sports car. In keeping with extraordinarily high deman_ds in terms of dynamic han_dling, the passenger cell is com-pact, creating a tailored feel. Nevertheless, there is a generous sense of space inside the two-seater, thanks, in part, to the deep seat position, which allows a low roof line, at the same time lowering the centre of gravity, which benefits dynamic han_dling. The backrest of the carbon fibre seat is set at an angle of 28 degrees to the seat cushion, rather than 25 degrees, in order to allow a sporty seating position.

Generous dimensions ensure an attractive interior. The SLR exceeds the shoulder an_d elbow width dimensions of many luxury an_d mid-class saloons, providing its occupants with plenty of personal space. The key interior dimensions of the Mercedes-Benz SLR McLaren:

• Interior length: 1006 mm
• Headroom: 919 mm
• Shoulder-height width: 1371 mm
• Elbow width: 1443 mm
• Seat cushion height: 565 mm

Interchangeable seat cushions for an individual fit

Having entered through the wide-opening swing-wing doors, the driver an_d passenger take their places on light, single-piece carbon fibre seats, the basic design features of which have proven their benefits in the world of motor racing. Thanks to the multi-layer carbon fibre composite structure, they are not only 25 percent lighter than con-ventional car seats but also offer ergonomic advantages: a set of two upholstery modules, in three different sizes, allows the seat contour to be adapted individually to the anatomy of the driver. Three sets of these side upholstery modules are available, ensuring that the seats can be adapted to the optimum upper body an_d hip width for the driver, providing made-to-measure lateral support. The individual modules, upholstered in semi-aniline leather, are bolted onto the carbon frame.

The single-piece carbon fibre composite frame is connected at four points to an electric seat adjustment mechanism, which is used to adjust the seats fore-an_d-aft position (by 130 millimetres), height (by 41 millimetres) an_d angle (up to 9.6 degrees) according to personal requirements. As a result of the single-piece design of the carbon fibre composite seat frame, the angle of both the seat cushion an_d the backrest are adjusted simultaneously.

High-class chronometer look for cockpit

Even the process of inser_ting the electronic ignition key has been imbued with an enthralling, uniquely SLR feel: a starter button on the solid metal shift knob at the top of the gearshift lever on the centre tunnel instantly begins to glow red. Apply slight pressure with your thumb, an_d the grid-style flap opens to provide access to the illuminated button. One press with your thumb brings the tremendous power of the V8 supercharged engine to life.

The interaction of various well-designed details in the interior underlines the thoroughbred character of the SLR at all times. Nevertheless, the cockpit design deliberately focuses on the essentials, in keeping with motor racing philosophy. Easily readable characters on a dark background, which were specially created for the SLR, define the instruments attractive, classic chronometer design - a design which, even at first glance, signals outstan_ding precision. They are enclosed by a matt chrome surface an_d are flanked by further displays, indicating the coolant temperature (left) an_d tank capacity (right), plus pilot lights an_d warning lights which only light up when the ignition is started or if there is a fault.

The brightness of the backlit dials automatically adapts to the prevailing light conditions in the interior of the swing-wing-door vehicle. A further unusual detail: when the engine is started, the needles spring back to their home position.

Cutting-edge displays in the lower section of the speedometer an_d the rev counter serve as an information centre for a number of functions. The aim of this control an_d display concept is to inform the driver of the operating status of the car without diverting his or her attention from the road. The two central displays are coupled both with the multifunction steering wheel an_d with the car radio, the telephone an_d the navigation system - which means that, at the touch of a button, the drivers personal list of stations, the selec_ted CD, the telephone directory or navigation information appears directly in the drivers field of vision.

Multifunction steering wheel with buttons for quick gear changes

Eight illuminated buttons on the multifunction steering wheel allow the driver to specify his or her requirements - a light tap with the thumb is all it takes. They provide a simple means of regulating the volume an_d of accepting or terminating phone calls.

The three-spoke steering wheel, which has a diameter of 380 millimetres, was specially designed for the Mercedes-Benz SLR McLaren. It can be adjusted for reach by 60 millimetres an_d its height can be varied by 2.7 degrees. On the back of the spokes are buttons which the driver can use to change gears in Manual mode without havin_g to take his or her han_ds from the wheel - a familiar feature in Formula 1.

Aluminium console with buttons for airbrake an_d shift program

The centre console, made from high-grade aluminium, is a further eye-catching feature on board the high-performance sports car. It houses not only the car radio with its navigation system, but the climate control unit an_d several new switches too, which activate an_d control various innovative technological features on board the SLR.

One of these switches operates the airbrake on the boot lid. From a speed of 95 km/h this automatically extends to provide more downforce, an_d when slowing down it rises to a steep angle to ensure optimum deceleration. The SLR driver can also use the switch here to position the airbrake as required.

The two rotary switches on the centre console are a further unusual feature. They can be used by the driver to selec_t between the automatic transmissions three different shift programs: "Manual", "Comfort" an_d "Sport". The driver can also use the right-han_d rotary switch to determine the speed of the gearshifts.

The radio an_d navigation unit are also accommodated in the centre console, concealed by an aluminium flap so as not to distract the driver. Beneath the radio/navigation unit are two ergonomically placed aluminium rotary switches for controlling the air conditioning system.

Material concept underlines elegance an_d sportiness

In the two-tone interior, which uses only selec_t materials such as high-quality leather, fine Alcantara for the entire roof trim an_d elegant pearl velour for the carpets, the dashboard is dark in order to prevent irritating reflections while the seats, door panels, tunnel trim, rear wall console an_d the rear shelf panel come in a contrasting colour.

There are plenty of inspired details: the high-quality integral loudspeakers in the door panels, for example, have a grid-form cover which echoes the styling of the air outlets on the sides of the vehicle. The rear of the grid surround forms the door han_dle, while a simple leather loop in the upper area of the door serves as a separate door pull - a traditional feature derived from the legendary Mercedes-Benz motor racing vehicles. The uncompromising, clean-cut interior of the Mercedes-Benz SLR McLaren also features aluminium pedals with rubber studs.

Large boot an_d roomy stowage compartments

An exceptionally large, saloon-style boot underlines the fact that this is a thorough-bred Gran Turismo, designed for long-distance travel. According to the VDA measur-ing method, it has a capacity of 272 litres. Even when the luggage compartment is fully laden, the occupants are still assured unimpeded access to the CD changer, which is housed in the boot.

In addition to the spacious boot, there is plenty of stowage space in the interior - a total of 46.1 litres, including a 42.5-litre compartment below the rear shelf. Further stowage compartments can be found in the rear wall an_d console of the centre tunnel.

The switches for adjusting the seats, the power window buttons an_d the door release are positioned within easy reach between the door sill an_d the seat, providing a further example of the sports cars consistent use of space an_d ergonomic design. The han_dbrake is located in a moulded recess to the right of the centre tunnel.

Automatic climate control with sensors which register the position of the sun, the air quality an_d humidity

Despite its uncompromising motor-racing character, the Mercedes-Benz SLR McLaren is fitted with a state-of-the-art climate control system, which offers the ulti-mate in power, functionality an_d controllability. The two easy-grip aluminium dials on the air conditioning control unit in the centre console allow separate temperatures to be selec_ted for the driver an_d passenger side - the set value is illuminated on the aluminium dial.

In automatic mode, a microcomputer monitors the functions of the automatic climate control system, receiving an_d processing a whole range of data. This includes information on the battery voltage, coolant temperature, engine speed an_d road speed plus the position of the doors an_d the side windows. Sensors supply further key readings:

• Two sensors continuously record the temperature in the interior.
• A solar sensor on the dashboard measures the angle of incidence an_d intensity of the suns rays so that the temperature, quantity an_d distribution of the air blown into the interior can be regulated appropriately.
• A dew point sensor in the air conditioning systems intake duct registers humidity an_d allows economic regulation of the refrigerant compressor.
• A pollutant sensor in the automatic climate control systems intake channel detects any increase in the concentration of carbon monoxide an_d nitrous oxides in the incoming air. If an increase is detected, the system automatically switches to recirculation mode.

Like the automatic climate control system in the Mercedes-Benz SL-Class sports car, the system on board the SLR operates according to the reheat principle: depending on its humidity, the incoming air is first cooled an_d in the process dried so as to ensure mist-free windows. Only then is it passed through the heating element an_d heated to the desired temperature.

Sophisticated lighting concept for the interior

One of the air conditioning systems sensors, which records the interior temperature, is accommodated in the overhead control panel. The panel also houses the switches for several of the lights which make up the sophisticated interior lighting concept.

Special features include lights below the sun visors which automatically switch on as soon as the visor is folded down an_d the vanity mirror opened. There is also a reading light which is installed in the interior mirror, an_d the doors each feature a round lens-shaped light which illuminates the door sill area when the doors are opened. The intensity of most of these lights is automatically regulated according to the ambient light conditions.

Specially adapted audio an_d navigation system

The Mercedes-Benz SLR McLaren is equipped with a top-class communication system which has been adapted to the requirements of a high-performance sports car. The Audio 30 APS car radio combines a radio an_d a cassette player plus the controls for the CD changer an_d the dynamic-route-guidance navigation system in a single unit. It has a clear design, is easy to operate an_d its functions are displayed in the speedometer an_d the rev counter - which means that the driver can concentrate on the driving rather than searching for information in excessive detailed displays.

The optimum sound quality comes courtesy of the Bose sound system, which has been specially attuned to the SLR. It uses a total of seven loudspeakers an_d sophisticated electronics, an_d not only compensates for interference but also has a microphone which constantly registers driving noise an_d adjusts the volume accordingly, without the driver havin_g to intervene.

Other integral features include the permanently installed mobile phone system an_d all of the aerials which are required for radio an_d telephone reception an_d for operating the satellite navigation system.

Telematic functions for accidents or breakdowns

SLR drivers also benefit from new traffic services with this cutting-edge communication system. The following highly effective telematic functions are available:

• TELEAID is an automatic emergency call system which, in the event of an accident, sends out an SOS signal to alert the emergency services an_d lead them to the scene of the accident. The emergency call is either triggered via a crash sensor or by pressing a button in the overhead control panel. At present TELEAID functions in Germany an_d the USA.
• TELEDIAGNOSIS makes contact with Mercedes-Benzs central Customer Assistance Centre (CAC) at the touch of a button on the car phone headset, at the same time informing the centre of all necessary vehicle data an_d the precise position of the car. This means that service personnel can be directed to the vehicle quickly an_d precisely. TELEDIAGNOSIS is available in Germany.
• MB Info is a service which offers Mercedes customers the opportunity, using the TELEAID technology, to direct general questions to the customer advisors at the Customer Assistance Centre. One touch of the "Info" button is all it takes to establish a free call. This service is currently offered in Germany an_d will be ex-tended to other countries in the future.

Engine an_d transmission: V8 powerplant with motor racing in its genes

An abundance of power an_d high-tech features from the world of motorsport - these are the defining characteristics of the V8 engine in the Mercedes-Benz SLR McLaren. Which means that the first 8-cylinder to be completely developed by Mercedes-AMG fits perfectly into the high-performance concept of the new Gran Turismo.

When developing the powerplant, the AMG engineers applied both the expertise they had acquired during their three-decade involvement in motorsport an_d the stringent stan_dards of the Mercedes-Benz bran_d. After an extensive concept phase, they decided in favour of an 8-cylinder design with a 5.5-litre displacement, a cylinder angle of 90 degrees, a screw-type compressor an_d a crankshaft supported by five bearings.

The result is impressive: from a mere 1500 rpm, the SLR powerplant delivers torque of over 600 Newtonmetres, rising to 700 Newtonmetres at 2000 rpm. The maximum of 780 Newtonmetres is available from 3250 rpm an_d remains constant in a broad engine speed range up to 5000 rpm. The supreme torque curve, coupled with the agile response of a sporty engine which never denies its high-performance character (it offers a peak output of 460 kW/626 hp at 6500 rpm - an extraordinarily high engine speed for this displacement size) speak a powerful language. As the figures indicate, the Mercedes-Benz SLR McLaren is endowed with what is currently one of the most powerful engines to be found in a series-produced roadgoing sports car. An overview of the key data:

• Cylinder arrangement: V8
• Cylinder angle: 90
• Valves per cylinder: 3
• Displacement: 5439 cc
• Bore/stroke: 97.0/92.0 mm
• Cylinder spacing: 106 mm
• Compression ratio: 8.8 : 1
• Output: 626 hp (460 kW) at 6500 rpm
• Max. torque: 780 Nm at 3250-5000 rpm
• Engine weight: 232 kg
• Power/weight ratio: 1.9 kW/kg

With this much power under the bonnet, the Mercedes-Benz SLR McLarens performance figures are among the best in its class:

• 0-100 km/h: 3.8 s
• 0-200 km/h: 10.6 s
• 0-300 km/h: 28.8 s
• Top speed: 334 km/h
• Fuel consumption: 14.8 litres per 100 kilometres (NEDC combined consump-tion, provisional figure)

Power from screw-type compressor

To ensure good cylinder charging, the engine has a mechanical compressor with two screw-type aluminium rotors which, in the interests of low friction losses, are Teflon-coated. The charger is so compact that the engine specialists were able to install it between the two cylinder banks of the V8 powerplant. Despite the space-saving design, its innovative technology allows a significantly higher charge pressure than conventional mechanical chargers because the two rotors achieve a top speed of around 23,000 revs per minute, forcing air into the air inlet of the 5.5-litre powerplant at a maximum pressure of 0.9 bar. This means that they compress around 1850 kilograms of air into the eight combustion chambers per hour - which is up to 30 percent more than the figure achieved by rival charging systems.

In order to ensure the greatest possible efficiency, the AMG engineers created an intelligent engine management system which regulates the operation of the screw-type compressor according to the engine speed an_d load. This means that the charger is only active when it is needed. Nevertheless, the system ensures that the maximum output is available as soon as the driver calls it up by stepping on the accelerator. When this occurs, the electronics of the engine management system trigger an electromagnetic coupling which immediately activates the compressor, which is powered by a separate poly-V-belt. Because the charger de-livers its output in fractions of a second, even the most perceptive driver will not notice the phases without charger support. The charger systems air recirculation flap, opened under partial load, helps reduce fuel consumption.

Two charge-air coolers with separate water circuit

In addition to the compressor, the electronics also monitor all other variables relevant to the engine - both the powertrain management for the pedal-dependent drive characteristics an_d the implementation of spontaneous transmission or ESP® interventions. They also ensure optimum control of the water circuit for the charge-air cooling system, as efficient charge-air cooling is essential where high output is concerned. This is because cold air is denser than warm an_d also con-tains significantly more oxygen for combustion. In the Mercedes-Benz SLR McLarens V8 engine, two separate charge-air coolers are responsible for this key task - one per cylinder. This ensures that loss of pressure is very low.

The highly effective engine-based charge-air coolers operate along the lines of an air/water heat exchanger: the air, compressed an_d hence warmed by the compressor, is cooled via a separate water circuit - making the process independent of the temperature outside. This means that the 8-cylinder can deliver its maxi-mum output an_d torque spontaneously at any time. The high performance figures of the 8-cylinder engine in the Mercedes-Benz SLR McLaren, however, not only deman_d good cooling of the combustion air but also result in an overall increase in engine cooling requirements. The engineers met this need by incorporating generous cooling air inlets an_d outlets an_d a powerful 850-Watt suction-type fan.

Crankcase with dry sump lubrication

The Mercedes-AMG GmbH engineers also applied their extensive experience in the world of motorsport an_d in the design of high-performance engines to other details of the SLR powerplant. The entire engine housing, for example, an_d the lower section of the closed crankcase are cast in aluminium. Each crankshaft is finely balanced an_d is supported by five bearings made from durable plastic, allowing long-term transfer of the impressive forces from the compressor engine.

The pistons are forged an_d are therefore only manufactured in minimal numbers. Like the forged lightweight conrods, they are precisely measured an_d weighed an_d allocated to the individual engines in such a way as to produce minimal balancing tolerances. The pistons move in highly robust, wear-resistant an_d friction-optimised walls made from a special compound which is otherwise only used in motor racing. Dual oil injection effectively cools the pistons.

The design of the powerplants oil cooling system is also based on experience gathered in the world of motor racing: a sophisticated dry sump lubrication system with an oil capacity of around eleven litres, combined with a five-stage oil suction pump an_d a two-stage oil pressure pump, ensures reliable lubrication under all on-road conditions. An important side effect of this technology is that, because of the dry sump lubrication, usually only used in motor racing vehicles, the engine is less tall an_d can therefore be installed at a lower level, allowing a low centre of gravity which benefits dynamic han_dling.

Following the usual practice at Mercedes-AMG, each SLR engine is manufactured by han_d. In order to achieve the highest quality, the principle of one man, one engine is applied. This means that each powerplant is the responsibility of one AMG engineer, who carries out the entire engine assembly process - from installing the crankshaft in the engine block an_d assembling the camshafts an_d the compressor to cabling.

Powerful high-pressure pumps in the tanks

The Mercedes-Benz SLR McLarens high-performance engine draws its fuel from two interconnected aluminium tanks. They are installed at a relatively low level to the left an_d right of the rear axle in order to keep the centre of gravity as low as possible to further en-hance dynamic han_dling. The tanks, which have an overall capacity of 97.6 litres - of which twelve litres form the reserve - are equipped with two integral high-pressure fuel pumps. These are controlled by the engine management system an_d ensure that the fuel supply matches the engine speed an_d load. Here too a highly effective, SLR-specific solution was developed: one pump operates constantly while the second is only activated as required.

Four metal catalytic converters for efficient emission control

Where the engine is concerned, secondary air injection an_d dual ignition create the criteria required for low exhaust gas emissions. A sophisticated exhaust gas system complements these measures: the cascade-design twin-pipe system consists on both sides of a bulkhead-mounted catalytic converter an_d a main catalytic converter with a special noble metal coating, accommodated in the same housing. The state-of-the-art metal design allows extremely thin wall thicknesses an_d therefore a very low exhaust gas backpressure. Thanks to its cutting-edge technology of its engine management an_d emission control systems, the new SLRs 8-cylinder engine already meets the stringent exhaust gas limits stipulated by EU 4 plus the current US limits.

On each side of the vehicle the catalytic converter housing opens into a rear silencer which, just behind the front wheels, flows into two stainless steel pipes with a diameter of 60 millimetres. These sidepipes - a further reminder of the 1950s SLR racers - allow the smooth-surfaced underbody, which plays a crucial role in producing the new Mercedes-Benz SLR McLarens first-class aerodynamic properties. The silencers are folded several times in precisely calculated acoustic sections which produce the thrilling characteristic engine sound of the Mercedes-Benz SLR McLaren. The capacity of each silencer is 19.6 litres.

Manual transmission program for racing car-style shift times

The five-speed automatic transmission, developed by Mercedes-Benz an_d already successfully used in several exceptionally powerful models, is also designed for high performance. It has been specially optimised for very high torque an_d also offers the driver the option of choosing between different shift characteristics. The transmission transmits the engine power via a finely balanced aluminium an_d steel powertrain to the differential an_d the rear axle.

The Speedshift system, developed by Mercedes-AMG for particularly sporty driving, offers even more functions in the Mercedes-Benz SLR McLaren. The driver can decide, for example, whether to leave the shift work to the automatic transmission or to shift gears manually. He or she can also selec_t the shift speed, determining how sporty the gearshifts are. A rotary switch in the centre console offers a choice of three settings: "Manual", "Comfort" an_d "Sport". The activated programme is indicated in the instrument cluster display by the letters "M", "C" or "S".

"Comfort" an_d "Sport" are automatic shift programs which, as the names indicate, place the emphasis either on comfort or on a more sporty drive. In "Manual" mode, on the other han_d, the driver can selec_t the five gears either using the but-tons on the steering wheel or using the Touchshift function on the selec_tor lever. When "Manual" is selec_ted, he or she also has the option of choosing between three shift stages for a sportier driving style:

• Stage I = "Sport"
• Stage II = "SuperSport"
• Stage III = "Race"

In the sequence indicated here, the response, reaction an_d closing times of the couplings in the automatic transmission, an_d hence the shift processes themselves, become increasingly shorter.

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