Brooklands 24th June 2016
Lewis Hamilton and Tobias Moers present the new AMG GT R
With the reigning Formula 1 world champion Lewis Hamilton as the star guest, Mercedes-AMG this evening presented the new AMG GT R* as the latest and most powerful member of the successful V8 sports car family. The venue for this presentation was the legendary Brooklands circuit in Great Britain, which is now the home of the automotive experience centre “Mercedes-Benz World”. Around 100 international media representatives were present when the 430 kW/585 hp “Beast from the Green Hell” was let out of its cage. The “Green Hell” refers to the birthplace of the AMG GT R – the North Loop at Nürburgring, where the new top model in the GT family was extensively tested. The name is also a reference to the exclusive, special “AMG light green magno” paint finish of the world premiere car.
“We have defined every single component dedicated to performance. The result is an overall composition which perfectly reflects our motto: “Handcrafted by racers”. That makes this sports car a milestone when it comes to driving dynamics.” Tobias Moers, Chairman of Mercedes-AMG GmbH, said about the latest member of the GT family.
The data at a glance:
|Mercedes-AMG GT R|
|Engine||4.0-litre V-8 with twin turbochargers and direct injection|
|Output||430 kW (585 hp) at 6250 rpm|
|Peak torque||700 Nm at 1900-5500 rpm|
|Driven wheels||Rear-wheel drive|
|Transmission||AMG SPEEDSHIFT DCT 7‑speed dual-clutch transmission|
|Fuel consumption – urban/extra-urban/combined||
15.0/9.2/11.4 l/100 km
|Combined CO2 emissions||259 g/km|
|Weight (DIN/EC)||1555*/1630** kg|
|Power-to-weight ratio||2.66*/2.79** kg/hp|
|Acceleration 0-100 km/h||3.6 s|
|Top speed||318 km/h|
*Kerb weight according to DIN, not including driver and luggage;
**Kerb weight according to EC, including driver (75 kg)
The third member of the AMG GT family is the new spearhead of the AMG model range. Featuring pioneering technologies, the AMG GT R was designed with racetrack use firmly in mind. Its development was largely based on vast motor-racing experience in AMG GT3 customer sport and the German Touring Car Masters. Figures such as 3.6 seconds from zero to 100 km/h and a top speed of 318 km/h, combined with the outstanding driving dynamics, will undoubtedly translate into extremely fast laps on the racetrack. The new exclusive colour “AMG green hell magno” alone establishes a visual link to the “Green Hell”, the nickname for the legendary “North Loop” of the Nurburgring, emphasising that the car’s roots are firmly embedded in the racetrack. Sharpened racetrack performance comes courtesy of the intelligent lightweight construction incorporating aluminium and carbon, specific reinforcements in the body shell, the uprated twin-turbo V-8 engine with the specifically adapted seven-speed dual-clutch transmission, the innovative aerodynamics with active components, and the new suspension with active rear-wheel steering and uniball joints.
The concept with front mid-engine and transmission in transaxle configuration on the rear axle, a tried-and-tested feature of the AMG GT and AMG GT S, makes for a beneficial rear-biased weight distribution of 47.3 to 52.7. In conjunction with the vehicle’s low centre of gravity, this translates into extremely agile handling and permits high cornering speeds. With a power-to-weight ratio of 2.66 kilograms per hp, the Mercedes-AMG GT R takes up pole position in its segment.
Close collaboration between design and aerodynamics experts
Aerodynamics engineers and designers worked together more intensively than ever during development of the new AMG GT R. The AMG design idiom of “Dynamic Presence” forms the basis for the far more expressive overall appearance and the very distinct look. Form follows function, and function supports form: All elements have an inherent technical benefit and contribute to the enhanced driving dynamics, while the aerodynamics experts have made the designers’ wishes a reality. This networking even resulted in an innovation that now has a patent pending.
The design of the AMG GT R embodies sensuous clarity – hot & cool. Apart from the powerfully sculpted body and the motorsport components, the new AMG Panamericana grille is a real eye-catcher. This unique feature also comes from the world of motorsport and is celebrating its standard-production première in the AMG GT R: Its 15 chrome-plated vertical fins cite the look of the new AMG GT3 racing car. The basic form of the new radiator grille goes back to the Mercedes‑Benz 300 SL racing car that won the legendary Panamericana road race in Mexico in 1952.
More power, more torque, faster response: the engine
The heart of the new high-performance athlete is pumping stronger than ever: the AMG 4.0-litre twin-turbo engine in the AMG GT R has an output of 430 kW (585 hp), which is 55 kW (75 hp) more than the previous top-of-the-range engine in the GT S. The peak torque of 700 Nm is available between 1900 and 5500 rpm.
The increase in performance was achieved with the help of new turbochargers with modified compressor machining, smaller wastegate aneroid capsule and sharpened engine mapping. The boost pressure supplied by the turbochargers has been increased from 1.2 bar in the AMG GT to 1.35 bar. In addition, the exhaust ports have been optimised and the compression ratio modified. The entire combustion process has been retuned.
A correspondingly modified application of the accelerator characteristics, charge-pressure build-up and transmission parameters ensures that the engine responds to load changes even more spontaneously and that gear changes are effected with even greater speed. The fact that the two-mass flywheel is 0.7 kilograms lighter than its counterpart in the AMG GT S likewise contributes to the highly agile impression.
The eight-cylinder unit thrills with its spontaneous response, precisely measured power output and linear power delivery with powerful thrust in all engine speed ranges, all of which makes the car far easier to control when driving at the limit. To make this possible, the sophisticated engine control electronics also take into account the current driving status and control the accelerator characteristics as a function of the occurring lateral forces also.
The AMG 4.0-litre V-8 engine features the tried-and-tested twin turbochargers, which are not mounted on the outside of the cylinder banks but rather inside the V configuration – experts call it a ‘hot inside V’. The benefits are: a compact engine design, spontaneous response from the turbochargers and low exhaust gas emissions thanks to optimum air flow for the close-coupled catalytic converters. This basic principle of the new AMG V-8 family has been further optimised for the AMG GT R and enables further improved performance. The maximum charge pressure is 1.35 bar; the turbochargers have a maximum speed of 186,000 revolutions per minute.
For optimum power output even when outside temperatures are high, Mercedes‑AMG uses indirect air-to-water intercooling. With optimum flow of air and water, the intercoolers have a separate, two-stage low-temperature water circuit. The first cooler stage involves two parallel coolers in the left and right wheel arch. Together with the large radiator at the front of the vehicle as a second radiator stage, the system is even more effective than in the AMG GT S. The downstream water-cooled intercoolers ensure that the charge air compressed and heated by the turbochargers is cooled effectively prior to entering the combustion chambers. It therefore remains at a constantly low level even under full load. A large radiator at the car’s front end ensures controlled cooling of the water circulating in the low-temperature circuit. Extremely short charge-air ducting makes for optimum responsiveness.
The combination of twin turbochargers and direct petrol injection with spray-guided combustion increases thermodynamic efficiency and output. Particularly fast and precise piezo injectors spray the fuel at high pressure into eight combustion chambers. Multiple injection occurs on-demand, ensuring a homogeneous fuel/air mixture. The delivery of fuel is electronically controlled and fully variable for a fuel pressure between 100 and 200 bar.
The aluminium crankcase is produced using sand casting technology and features a closed-deck design. This ensures extreme strength while keeping the weight as low as possible, and allows high injection pressures of up to 140 bar.
The NANOSLIDE® coating of the cylinder liners is also used in the Formula One engines of MERCEDES AMG PETRONAS. It is far harder than conventional grey cast-iron liners and therefore less susceptible to wear. In addition to this, its reduced friction in combination with the aluminium forged pistons helps to increase efficiency.
Four overhead camshafts control a total of 32 valves. Camshaft adjustment on the intake and exhaust side enables an excellent throttle response and optimises the gas cycle for each operating point.
The dry sump lubrication also ensures the oil supply even with high lateral forces and allows the engine to be installed lower, thus moving the centre of gravity closer to the road and forming the basis for high lateral acceleration.
The engine for the AMG GT R is also fitted by hand in the hand-finishing section of AMG’s production plant in Affalterbach based on the “One Man – One Engine” philosophy. This means that each engine is assembled by a highly qualified engine builder who applies the strictest quality standards. This engineer is responsible for everything from installing the crankshaft in the engine block and assembling the camshafts to wiring the engine and filling it with engine oil ‑ as clearly evidenced by the signature on the AMG engine badge.
Pure sound: the AMG performance sports exhaust system
The specially developed exhaust system not only delivers genuine racing car sound, it also saves around six kilograms of weight compared with the AMG GT S thanks to the use of titanium for the rear silencer and thin-walled stainless steel for the front section of the exhaust system.
With its special, hexagonal form, the large tailpipe tip centred in the rear fascia emphasises the car’s motor-racing character. Two more tailpipes are located on the left and right in the diffuser. Their tips are sheathed in carbon fibre like in motorsport to protect the diffuser against high exhaust temperatures. The exhaust system features two infinitely variable exhaust flaps as standard, which have a direct influence on the sound of the AMG GT R.
The exhaust flaps open and close depending on the selected AMG DRIVE SELECT mode, although they can also be controlled individually using a separate button in the AMG DRIVE UNIT. In the “Comfort” and “Sport” settings, the low-frequency sound typical of a V-8 is designed for comfort. In “Sport Plus” and “RACE” modes, meanwhile, the sound composition is far more emotive.