When it comes to the suspension, the TT RS takes advantage of all of the excellent qualities the basic design of the TT has to offer. The front wheel suspension, with a track of 1,555 millimeters (5.10 ft), is a McPherson structure with triangular lower wishbones. The pivot bearing, the subframe and the control arms are made of aluminum; the subframe is bolted to the body at six points for greater rigidity.
The modified characteristic of the variable-assist rack-and-pinion-steering matches the dynamic character of the TT RS. Because the electromechanical system does not require any energy when traveling straight, it is extremely efficient and saves approximately 0.2 liters of fuel per 100 km. The 16.9:1 ratio is sporty and direct.
Thanks to its sophisticated design, the four-link rear axle (track: 1,546 millimeters (5.07 ft) can provide longitudinal and lateral support separately. The longitudinal links absorb the driveline and braking forces, and their relatively soft mounts provides good ride comfort. On the other hand, the three wishbones per wheel – the spring link, the upper wishbone and the tie rod – are attached very rigidly to the subframe, for optimum handling characteristics.
The elastokinematics of the rear links – all made of high-strength steels – are slightly modified from the technical foundation. Separate coil springs and newly developed dampers provide vertical support. The TT RS is 10 mm (0.4 in) lower than the high-volume TT. The developers perfected the setup in exhaustive testing, including many fast laps around the North Loop course at the Nürburgring.
The top-of-the-line TT is available with an optional electronic controller for the shock absorbers – the high-tech Audi magnetic ride system. Circulating within the damper pistons is a synthetic hydrocarbon containing tiny magnetic particles between three and ten micrometers in size. When a current is applied to a coil, a field is generated in which the alignment of the particles changes. They align perpendicular to the flow of the oil and thus prevent it from flowing through the piston channels. The characteristic of the damping thus changes within just a few milliseconds.
The system’s controller analyzes the driver’s style and the condition of the road constantly and adapts the function of the system accordingly. The driver can use the Sport button to switch between the normal characteristic and Sport mode. In standard mode, when oil viscosity is high, the TTS offers a well-balanced, comfortable ride. In Sport mode – with restricted flow – the ride is uncompromisingly stiff with practically no lateral roll. The targeted support of the wheels provides for more neutral self-steering behavior and more precise steering response.
A solid basis: 18-inch to 20-inch wheels
TT RS comes standard from Audi with large, 5-twin-spoke cast aluminum wheels in the size 9J x 18 shod with 245/40 tires. A number of wheels in various designs and sizes up to 20 inches are optionally available. The 19-inch wheels with 255/35 tires are optionally available in high-gloss silver or titanium look.
The large wheels have room for powerful brakes. All four disks are internally ventilated and measure 310 millimeters in diameter at the back and 370 millimeters up front. The front friction rings are perforated for maximum heat dissipation and connected by hollow pins to the aluminum brake disks. Four-piston calipers, painted black and decorated up front with RS logos, firmly grip the disks. These are also manufactured of aluminum to reduce the unsprung masses.
The ESP electronic stabilization program is designed for dynamic driving and can be deactivated in two stages. In Sport mode, the engine does not intervene to control traction, and the brakes engage later than otherwise. In the second mode, the ESP is fully deactivated.
The equipment, specifications and prices stated herein refer to the model line offered for sale in Germany. Subject to change without notice; errors and omissions excepted.