C 55 AMG Chassis

More fun behind the wheel and improved dynamic handling without any major sacrifice of comfort — these were the goals laid down for the chassis development of the new C 55 AMG. The responsible engineers and technicians at Mercedes-AMG GmbH focused on three areas in their developmental work: chassis tuning, dynamicdrive control system and wheel-tyre combinations. All components and systems had to be adapted to the new V8 engine in order to achieve extra sportiness.

The new AMG sport chassis makes a significant contribution to boosting the dynamic handling. Springs with a 20 per cent higher rigidity, harder gas shock absorbers with degressive characteristics and a bigger stabilizer on the rear axle (only in the C 55 AMG estate) not only make the most of out of the road but also reduce the body roll that happens when a car drives rapidly through a curve and the roll angle in alternating curves.

The elastokinematics were reworked on both axles: Both the tension strut on the McPherson three-link front axle and the spring suspension link of the multi-link independent rear suspension are harder. As a result, driving through curves becomes much more precise. The noticeable gains in steering precision and spontaneity have been achieved without any noticeable loss in suspension comfort.

Dynamic-handling control systems comprehensively overhauled
All of the dynamic-handling control systems, such as the ABS anti-lock braking system, the braking assistant, the ASR acceleration skid control system, and the ESP® Electronic Stability Program, were reworked and modified in comprehensive calculations and test drives. For example, the acceleration skid control system now has a traction function when the ESP® is shut off.

When a car enters a curve at high speed, the system determines when the back tyre on the inside part of the curve starts to slip and can brake it to a precisely calculated degree. The effect that is created corresponds to that of a mechanical locking differential and promotes the traction of the driven wheels.

Even when shut off, the ESP® recognizes a potentially unstable driving situation, for example when the driver suddenly applies the brakes. Within milliseconds, the ESP is completely available again. A potential accident can thus be prevented. What’s more, the control processes in all operating conditions have been made more harmonious.

Steering ratio now seven percent more direct
Just like all of the variants of the new generation C-Class, the C 55 AMG also profits from the modified power steering system. The steering ratio is now seven per cent more direct, thus improving the vehicle’s handling and steering precision. These improvements deliver a major dose of behind-the-wheel fun to sporty drivers in particular.

The new 18-inch AMG light-alloy, double-spoke wheels being used as standard equipment for the first time in the C-Class create a spontaneous, dynamic form of handling. The front axle has tyres in the 225/40 ZR 18 format on 7.5-inch-wide rims. On the back the dimensions are 245/35 ZR 18 on 8.5-inch-wide rims. The track of the front axle has been expanded by 14mm, improving driving stability and steering behaviour.

The robust AMG high-performance braking system guarantees a high degree of driving safety. Large, inner-ventilated disc brakes on the front and rear axles — the front discs are also perforated — enable first-class braking deceleration. When the brakes are fully applied at 100 km/h, the C 55 AMG comes to a halt in fewer than 36m.

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