2012 Mercedes-Benz SLS AMG Roadster

Interior atmosphere like an aircraft cockpit

The interior continues the breathtaking design idiom of the exterior, and awakens associations with an aircraft cockpit: prominent features include the dashboard in the shape of a wing and the air vents with adjustable, cruciform nozzles reminiscent of jet engines. The extended center console of matte, solid metal and the new E-SELECT lever in the shape of an aircraft’s thrust control are also design features adopted from the world of aviation. Another discreet, fine detail is the embossed AMG emblem on the leather-lined selector lever.

The AMG DRIVE UNIT – which like numerous other interior features is available in genuine carbon-fiber – is the central control unit in the center console: it allows the driver to choose a personal vehicle setup, including adjustment of the optional Adaptive AMG Sport Suspension. The AMG Performance steering wheel with its high-grade premium leather lining and flattened bottom rim section provides perfect vehicle control. The shift paddles and lower steering wheel bezel are made of solid metal.

Fully automatic, weight-optimized soft top

The sensual experience in the 2012MY SLS AMG Roadster is further enhanced when the soft top is open, and the powerful, naturally aspirated eight-cylinder engine with 563 hp and 479 pound-feet of torque asserts itself and makes the heart beat faster with its distinctive AMG eight-cylinder sound. The fabric soft top can be opened and closed while on the move at speeds up to 31 mph (50 km/h); the fully automatic opening/closing process takes only eleven seconds. The driver only needs to operate the roof control unit conveniently integrated at the front of the center armrest. When open, the soft top is space-savingly retracted behind the seats in a folded Z-configuration. Three soft top colors – black, red and beige – are available to suit the nine exterior and eight interior colors.

The three-layered fabric soft top is a weight-optimized magnesium/steel/aluminum construction, and contributes greatly to the car’s low center of gravity. The soft top has a seamlessly bonded rear window of heated singlelayer safety glass. The flush, gap-free transition between the outer roof skin and the rear window keeps wind noise low. A continuous, flexible water pocket running under the soft top catches rainwater and directs it to the underbody via two apertures on each side. The trunk capacity is 6.1 cubic feet with the roof either open or closed, and therefore roughly equal to that of the SLS AMG Coupé (6.2 cubic feet).

Outstanding material quality and finish

The finest leather, matte-finished solid metal or optional, genuine carbon-fiber trim create an exclusive ambience and correspond with the authentic feel of the cockpit. Precisely executed decorative and contrasting stitching enhances the visual impression, heightens the hand-crafted look and reflects the attention to detail which is the hallmark of Mercedes design.

The standard appointments of the Mercedes-Benz SLS AMG Roadster include black designo leather, heated AMG sports seats, a detachable glass windstop, COMAND with Navigation and DVD player, anti-theft alarm system with tow-away protection and interior monitoring, dual-zone automatic climate control and the KEYLESSGO starting function. The standard AIRSCARF® system exclusive to Mercedes-Benz acts like an invisible scarf warming the head and neck areas of the occupants. It is integrated into the backrests of the AMG sports seats, and blows warm air from vents in the head restraints. The airflow can be adapted for different occupant sizes by means of adjustable louvers, and the level of warmth can be selected in three stages at the touch of a button.

Leather-lined roll-over bars with integrated mesh in a “Silver Shadow” look are available in conjunction with designo Exclusive leather to reduce turbulence in the cockpit. Ambient lighting is integrated into the electrically folding exterior mirrors.

Single-tone or two-tone designo leather in espresso brown is available as a new interior color – this dark shade of brown perfectly matches the new metallic paint finish AMG Sepang brown.

AMG Performance Media and Bang & Olufsen as optional highlights

In addition to the Bang & Olufsen BeoSound AMG surround sound system, another optional entertainment highlight is the AMG Performance Media. In an unprecedented way, this racing-inspired system combines numerous telemetric displays such as engine data, lateral and linear acceleration and lap times on a racetrack. AMG Performance Media is activated by pressing the AMG key in the AMG DRIVE UNIT, and operated using the COMAND Controller. Key functions at a glance:

• Real-time display of engine oil, coolant and transmission fluid temperature
• Real-time display of engine output, torque and accelerator position
• Real-time display of individual tire pressures
• Real-time display of acceleration time from 0-60 mph or 0-100 km/h (alternatively: quarter-mile)
• Real-time display of lateral and linear acceleration combined with braking performance and accelerator position, including memory function
• Recording of individual lap times on a closed racetrack, with sector times and memory function
• Integration of DRIVE UNIT functions to save setup data to memory and initiate RACE START

The different functions of AMG Performance Media are shown by the color display integrated into the dashboard. Three displays are shown at any one time, with the most important information positioned in the center. Digitally simulated dial instruments with red needles ensure outstanding legibility.

Specifically reinforced aluminum spaceframe, low curb weight

In addition to maximum comfort, the key factor for driving pleasure in the new SLS AMG Roadster is the outstanding performance. The basis for this is the innovative body design: the chassis and body are made of aluminum, a design combining intelligent lightweight construction with high strength. With a curb weight of 3,661 pounds (estimated), the Roadster is only 88 pounds heavier than the Coupé. The result is a remarkable power-to-weight ratio of 6.5 pounds per hp.

To achieve the same level of driving dynamics – without a fixed roof, the Mercedes-Benz SLS AMG Roadster incorporates several features specifically designed to strengthen the bodyshell, including side skirts with greater wall thicknesses and additional chambers. The dashboard cross-member is supported against the windshield frame and center tunnel by additional struts, and a curved strut between the soft top and the tank reinforces the rear axle. The lack of a roof and gullwing doors means that the open-top SLS AMG has a reinforcing crossmember behind the seats to support the fixed roll-over protection system. This also accommodates the 250 watt subwoofer of the Bang & Olufsen BeoSound AMG high-end sound system.

All this prevents unwanted vibrations right from the start, and makes it unnecessary to use the additional, weight-increasing vibration dampers that are often found in open-top sports cars. The weight-optimized aluminum spaceframe weighs 536 pounds, tipping the scales at just 4.5 pounds more than the gullwing model.

Intelligent material mix and low center of gravity

50 percent of the intelligently designed, weight-optimized aluminum spaceframe is made of aluminum sections, 26 percent of sheet aluminum, 18 percent of cast aluminum and 6 percent of steel. Maximum occupant safety requires the use of ultra-high-strength, heat-formed steel in the A-pillars.

The entire vehicle has been designed to achieve the lowest possible center of gravity. This applies both to the low connection points of the powertrain and axles, as well as to the arrangement of the rigid bodyshell structure, which has been kept as low as possible. Examples include the rigid flexural and torsional connections between the front and rear section and the passenger safety cell, which have been designed to use force paths that are as low as possible.

Passive safety

The aluminum spaceframe provides the basis for outstanding passive safety. The extensive safety features include the fixed roll-over protection system, three-point seat belts with belt tensioners and belt force limiters, and eight airbags: adaptive front airbags and kneebags, two seat-integrated sidebags and two windowbags deploying from the door beltlines.

The standard Blind Spot Assist helps the driver with a visual warning symbol and acoustic alert if the danger of a collision with another vehicle is detected when changing lanes.

Powerful AMG 6.3-litre V8 engine with 563 hp

The Mercedes-Benz SLS AMG Roadster has the same, muscular engine as the gullwing model. The 6.3-litre V8 with a peak output of 563 hp at 6,800 rpm makes the open-top SLS one of the most powerful sports cars in its segment. Its power-to-weight ratio is 6.5 pounds per hp. This naturally aspirated engine generates its maximum torque of 479 pound-feet at 4,750 rpm. The convertible SLS AMG accelerates from zero to 60 mph in 3.7 seconds (0-100 km/h in 3.8 s), and the top speed is 197 mph / 317 km/h (electronically limited) – which means that the Roadster has almost identical performance to the gullwing.

The high-revving 6.3-liter V8 engine has the typical characteristics of powerful racing engines. It responds immediately and effortlessly to accelerator movements. The use of a dry sump lubrication system allows for a considerably lower installation in the vehicle, yielding a lower center of gravity for high lateral acceleration and thrilling driving dynamics.

Achievement of demanding fuel consumption targets

Despite its uncompromisingly athletic character, fuel consumption has also been addressed. The SLS AMG consumes 13.2 litres per 100 kilometres (NEDC combined), corresponding to CO2 emissions of 308 grams per kilometre. Efficiency enhancements include the familiar AMG-exclusive, friction-optimized twin-wire arc-sprayed coating on the cylinder walls as well as the on-demand, map-optimized oil supply and intelligent generator management: during the engine’s overrun phases, kinetic energy is used to charge the battery rather than wasted by simply generating heat. Conversely, the generator is switched to no-load operation during acceleration, thus reducing the load on the engine. Sophisticated catalytic converter technology enables current and future emission standards such as Euro-5, LEV 2 and ULEV to be met.

Rev-matching transmission with transaxle configuration and torque tube

The AMG 6.3-litre V8 engine delivers its abundant power to the rear transaxle via an ultra-light carbon-fiber driveshaft – similar to the setup used in the DTM C-Class racing touring car. The rev-matching transmission is mounted at the rear (transaxle), and connected to the engine housing via a torque tube. A carbon-fiber shaft rotates at engine speed in the torque tube. The advantages of this sophisticated solution lie in the rigid link between the engine and transmission and, in turn, the optimum support for the forces and torque generated.

The AMG SPEEDSHIFT DCT 7-speed sports transmission boasts fast gear changes with no loss of tractive force – in as little as 100 milliseconds. The driver has a choice of four different driving modes: “C” (Controlled Efficiency), “S” (Sport), “S+” (Sport plus) or “M” (Manual). In the Sport, Sport plus and Manual modes the automatic rev-matching function is active; all the modes can be selected conveniently via the rotary control knob on the AMG DRIVE UNIT. The RACE START function provides optimum traction for full power launches from a dead stop — as does the mechanical differential lock, which is integrated into the compact transmission housing.

Sophisticated suspension layout with double-wishbone axles

The front-mid-engine plus transaxle configuration provides an ideal front/rear weight distribution of 47 to 53 percent. Mounting the engine behind the front axle has created ideal driving dynamics with precise steering, first-class agility, low inertia for spontaneous directional changes and outstanding traction. All four wheels are located on double wishbones with a track rod, a technology that has proven itself in motor racing right through to Formula 1. With a double-wishbone axle, the wheel location and suspension functions remain separate; the spring/damper struts are supported on the lower wishbone. The double-wishbone setup with its high camber and track rigidity positively locates the wheel with minimal elastic movements, providing the driver with an optimum sense of road contact when driving at the limits.

Wishbones, steering knuckles and hub carriers at the front and rear are made entirely from forged aluminum – substantially reducing the unsprung masses; this configuration also notably improves the suspension response. The long wheelbase of 105.5 inches not only results in outstanding straight-line stability but also low wheel load shifts, significantly reducing the vehicle’s tendency to dive and squat when braking and accelerating. The broad track width – front 66.2 inches, rear 65.1 inches – provides lower shifts in the wheel loads from the inner to the outer wheel when cornering, enabling the tires to retain more grip.

New Adaptive AMG Sport Suspension

The new Adaptive AMG Sport Suspension with electronically controlled damping is available as an attractive optional alternative to the standard AMG sports suspension. It enables the damping characteristics to be modified at the touch of a button. Using a button on the AMG DRIVE UNIT, the driver can choose his own suspension setup. Three modes are available: “Comfort”, “Sport” and “Sport plus”. The current mode is shown in the instrument cluster.

“Comfort” delivers a sensitive response with soft damping characteristics, while in “Sport” mode the shock absorbers have a much stiffer response depending on the driving situation. This not only leads to better road contact, but also effectively suppresses body roll and pitching. “Sport plus” is ideal for challenging laps on a racetrack: in addition to the higher damping force, this mode comes with specific control algorithms that have been tailor-made for a sporty driving style. The new, variable suspension will also be optionally available for the SLS AMG Coupé in future.

Direct steering, differential lock and 3-stage ESP®

The rack-and-pinion steering gear provides a consistently direct steering feel with a constant mechanical ratio of 13.6:1, in tune with the high expectations placed on a super sports car. The power steering provides speed-sensitive assistance and improves feedback for the driver as speed increases, valuable during high-speed straight-line driving. Mounting the steering gear in front of the engine on the integral subframe enables the engine to be set down very low. The SLS AMG comes with 3-stage ESP® as standard, providing the driver with access to the three “ESP ON”, “ESP SPORT” and “ESP OFF” modes at the touch of a button. In “ESP OFF” mode, operating the brake pedal restores all the normal ESP® functions.

The acceleration skid control (ASR) system’s traction logic is active in all three ESP® modes. If one of the drive wheels starts to spin, specific brake pressure is applied to improve traction significantly – especially in conjunction with the standard-fit mechanical multi-disc limited-slip differential. This means that the engine power is transferred to the road more effectively during aggressive driving.

Optional AMG ceramic high-performance two-piece braking system

The AMG high-performance braking system with two-piece brake discs at the front provides extremely short stopping distances even under enormous loads. Red-painted brake calipers at all four corners are available as an option. The optional ceramic two-piece brakes with even larger discs provide even better braking performance. The ceramic brake discs perform at even higher operating temperatures thanks to their greater hardness, all combined with an impressive weight reduction of around 40 percent. Reducing the unsprung masses has further improved both comfort and grip, and the reduced rotating masses at the front axle provide a more direct steering response.

Lightweight construction was also key when it came to the wheels: AMG light-alloy wheels based on the innovative flow-forming principle reduce the unsprung masses while improving driving dynamics and suspension comfort. In addition to the standard AMG twin 5-spoke light-alloy wheels, there is a 7-spoke wheel that’s available as a no cost option. Weight-optimized 10-spoke forged wheels are available as an option. 265/35 R 19 (front) and 295/30 R 20 (rear) tires developed exclusively for the SLS AMG provide optimum performance. A tire pressure monitoring system is fitted as standard to permanently monitor tire pressure in all four wheels, with an individual display for each tire.

Production in Sindelfingen, market launch in Fall 2011

The convertible super sports car will be produced at the largest Mercedes-Benz production plant in Sindelfingen. The AMG 6.3-litre V8 engine comes directly from the AMG engine workshop in Affalterbach, where it is hand-assembled according to the traditional “One man, one engine” philosophy.

The selling price in Germany is €195,160 (incl. 19% VAT). The 2012 SLS AMG Roadster will make its U.S. debut in Fall 2011.

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