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BACANA MAGAZINE hotel occidental punta cana
BACANA MAGAZINE hotel occidental punta cana
Mercedes-AMG GT

Mercedes-AMG GT, born to Run

Recently in the Paris motor show, Mercedes revealed its specifications, such as it has a top speed of 318 km / h (310 for GT S) or it can dash from standstill to 100 km / h in just 3.6 seconds (two tenths less than the GT S), and is clearly built not only to compete with the Porsche 911 R or the new Audi R8 V10, but also with Ferrari and Lamborghini.

More ground effect Its appearance is definitely impressive, with a revised aerodynamic based on the competition version GT3, whose large variable air intakes in the front bumpers open and close according to the needs of engine cooling. Wider than the GT (almost 5 cm front and almost 7 cm back), it has a large rear wings manually adjustable that together with the rear diffuser increases the dynamic pressure on the rear axle, making its active aerodynamics a fundamental factor for this AMG GT R. Thanks also to its variable and movable bumper, the front axle can carry a high aerodynamic load at high speed (up to 155 kg of extra pressure).

The variable carbon fiber front lip lowers to the ground 4 cm to increase the velocity of airflow effect from 80 km / h (in "race" driving mode), so that its airflow circulated underneath the car causes the so-called ground effect to increase road holding while reducing (according to Mercedes AMG) aerodynamic drag on the car and increasing downforce.

Conceived as what used to be called a "race/customer" car, it uprates the AMG GT range. Suspensions have been developed specifically for race circuit use, with variable preload coilovers, manually adjustable as drivers prefer and the dampers are equally variable and adaptive, with three predefined action programs for (Comfort, Sport and Sport Plus, as in all AMG GT) and also a nine levels traction control to adapt to each driving mode through a control panel.

The ESP has also been tared for the new performance level, with three functions -On, Sport Handling Mode and Off- that also regulates the action of traction control and self-locking differential mechanism, including rear suspension with new bearings assembly, that decrease falling movements and front wheels convergence, and a thicker stabilizer bar. In the interior, there are very few changes (the AMG Performance sports seats in "nappa" leather and microfiber, this time with contrasting stitching in yellow (such as belts, headrests, frame, etc).

Improvement of performance.- There are not considerable changes in mechanics, just enough to improve its performance, like new higher blowing pressure turbochargers (2.35 bar versus 2.2 in GT S). The engine is essentially the same as the AMG GT (and its version AMG GT S): 4.0L twin-turbo V8 with a displacement of 3,982 cc, an excess horsepower of 585, that is, 123 hp more than in AMG GT (462 hp) and 75 hp more than in the AMG GT S (510 hp), based on that greater turbochargers blowing and other small touchups (compression ratio, combustion chambers, dual mass lightened flywheels -700 grs less-, etc.). The cooling system has also been modified, reinforced to better withstand high mechanical loads under high temperatures.

The real change is still the AMG Speedshift DCT from the rest AMG GT, automatic 7-speed dual-clutch transmission, although retouched (revised "race start" function to raise the limit of engine rotation when it stars) looking for greater sportiness, 1st gear longer and 7th gear shorter. The gear box mounts a drive shaft in carbon fiber (as in the AMG GT and GT S) that weighs about 14 kg less (40% lighter than the GT S) including an enhanced cooling system in order to withstand greater demands .

Talking about weight, it has to be said that it is lightened about 90 kg versus the base model (1,554 kg unladen mass ratio, and 1,630 kg in running order), which means 15 kg less than the AMG GT S. It is because of the use of lightweight materials, especially carbon fiber (doors, hood, roof ...), which are also used to increase stiffness and reduce weight in structural parts such as car body floor and engine compartment.

Other measures to reduce weight are the use of forged 19 "and 20" aluminum wheels (wrapped in Michelin Pilot Sport Cup 2 tires, size 275/35 R19 front and 325/30 R20 rear), the titanium exhaust muffler and removal of layers made of insulation material. The brakes consist of large ventilated discs 390 mm front and 360 mm rear which are coupled to 6-and 4- pistons calipers painted yellow, and perhaps made of carbo ceramics.

But it could be that the biggest difference of this AMG GT R compared with its brothers relies on its rear axle steering, a high level innovation included in very few of its rivals (like Porsche 911 GT3 or Ferrari GTC4). With this 4-wheel steering, the rear axle can turn in a curve in the opposite direction to the front axles up to a maximum of 1,5º (up to 100 km / h; as of this speed they will turn in the same direction that the front, with an electronic and non-mechanical transition (as in Porsche 911 GT3) to ensure maximum progressivity of the turn.

TEXTO: J. Robredo; IMÁGENES::Motor Mundial / Archivo

Tags: Motor

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