The Audi TTS: The Drivetrain
The TFSI engine fitted in the TTS summons its power from a displacement of 1984 cc, and blends two separate Audi technologies gasoline direct injection and turbocharging to form a partnership that is perfect for a sports car. It is with good reason that an international jury of motoring journalists has crowned the two-liter four-cylinder power unit “Engine of the Year” three times in succession since 2005.
It is not only the 200 kW (272 hp) of output that makes the TFSI so scintillating, there’s its hefty pulling power too the maximum torque of 350 Nm (258.15 lb-ft) is constantly on tap from 2,500 up to 5,000 rpm. The Coupe with manual transmission takes just 5.4 seconds to race from zero to 100 km/h (62.14 mph), while a mere 4.4 seconds are required to speed up from 80 to 120 km/h (49.71 to 74.56 mph) in fourth gear. The Roadster is almost as impressive, recording times of 5.6 and 4.6 seconds respectively for the same two exercises. The electronic limiter calls a halt to this outstanding propulsion at a speed of 250 km/h (155.34 mph) in both models.
Compared to the engine it was derived from, the two-liter power unit has undergone extensive reengineering and strengthening to ready it for operation in the TTS overhauled areas include the engine block, the cylinder head, the pistons, the connecting rods and the turbocharger, which can build up as much as 1.2 bar of relative air pressure. The intake and exhaust systems have undergone elaborate honing to allow the refined four-cylinder engine to both breathe freely and generate a powerful, resonant soundtrack. An optimized and highly efficient intercooler lowers the temperature of the compressed air, producing a crucial increase in the quantity of air supplied for combustion.
Thanks to its outstanding efficiency, the TFSI has impressive fuel consumption of 7.9 liters per 100 km (29.747 mpg) in the Coupe when partnered by the S tronic transmission, and just 8.0 l/100 km (29.375 mpg) in the Roadster. The two-liter engine is extremely light, weighing in at 153 kilograms (337.31 lbs). This has considerable benefits for the overall weight of the TTS as well as for the axle load distribution and, consequently, for the vehicle’s handling.
High-tech gearshifting: S tronic
Transmission of the engine’s power is handled as standard in the TTS by a manual six-speed gearshift with a light-weight magnesium housing. As an alternative, customers can opt for S tronic, which operates using six gears and two clutches positioned one behind the other. At high engine loads and rev speeds, it is capable of shifting in just two-tenths of a second. As a result of this high-speed shift work and its dynamic start-off capabilities, the dual-clutch transmission from Audi shaves a whole two-tenths off the time taken for the sprint from zero to 100 km/h (62.14 mph) in both the Coupe and the Roadster.
S tronic, which likewise boasts excellent efficiency, also allows the driver to shift gears manually using the one-touch lever or by means of paddles on the steering wheel, just like in a racing car. There is also a choice of two automatic operating modes: N for Normal and S for Sport. The clutches also have an adaptive design, enabling the start-off characteristics to be varied whereas caution is exercised on slippery surfaces, full power can be unleashed at the driver’s command when there is firm grip.
The standard-specification quattro permanent all-wheel drive ensures loss-free transfer of the engine’s power to the road. With drive power being delivered to all four wheels, the TTS is able to accelerate quicker and more safely than its rivals, delivering dynamism coupled with supreme stability under all conditions.
At the heart of the quattro system is an electronically controlled and hydraulically operated multi-plate clutch, which now works even faster than ever thanks to a new pressure reservoir. If required, all of the drive force can be redirected from the front to the rear wheels within a matter of milliseconds. To make allowance for the high torques produced by the TFSI engine in the TTS, the drive train has been reinforced as required.
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.
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