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- Audi TT clubsport turbo concept combines a 2.5 TFSI with an electric biturbo for the first time
- Board Member for Development, Prof. Dr. Ulrich Hackenberg: “Technology close to production readiness”
Audi will be launching innovative technology and concentrated power at the Wörthersee Tour 2015. At the big meeting in Reifnitz, Austria (Carinthia) from May 13 to 16, the premium car brand will be presented the latest race cars, performance cars and production models to its fans along with a very special highlight: the TT clubsport turbo. This technical concept car combines a powerful TFSI engine with an electric biturbo. This means that it leaves its competitors in the dust after only a few meters.
Wide add-on parts, a powerful rear wing and a power output of 441 kW (600 hp) – the Audi TT clubsport turbo impresses with its power and design. The inspiration for the show car came from the successful Audi 90 IMSA GTO of the late 1980s.
“The electric biturbo signifies a new dimension in driving enjoyment; it boosts sprinting ability and torque and enables high peak power,” explains Prof. Dr. Ulrich Hackenberg, Audi Board Member for Technical Development. “In our TDI engines, we are close to production readiness with this technology. We are now presenting it in a TFSI – here too, we are the first automaker in the world to do this. For our fans at Wörthersee, we have packaged the electric biturbo in a very sporty show car.”
The Audi TT clubsport turbo has a power-boosted 2.5 TFSI engine with very impressive performance data. From 2,480 cc of displacement, the five-cylinder engine produces 441 kW (600 hp) of power and 650 Nm (479.4 lb-ft) of torque. More than 600 Nm of torque are available between 3,000 and 7,000 rpm. This means that it produces 176 kW (240 hp) and 260 Nm (191.8 lb-ft) per liter of displacement. Power is transferred via a manual six-speed transmission.
Thanks to systematic lightweight design, the TT clubsport turbo show car has an unladen weight of just 1,396 kg (3,077.7 lb). The car completes the standard sprint from 0 to 100 km/h (62.1 mph) in 3.6 seconds, and its top speed is 310 km/h (192.6 mph). The TT clubsport turbo plays out its big advantage over the first few meters of a sprint. Its electrically driven compressor lets it cover up to 16 meters (52.5 ft) within the first 2.5 seconds – which is six meters (19.7 ft) further than a comparable car without this innovation. That is a difference of around one and a half car lengths.
Electric thrust: additional compressor assists the turbocharger at lower revs
The big advantage of an electrically powered compressor: It revs up to maximum rpm rapidly and without any perceptible delay, and it continues to boost charge pressure when too little drive energy is left in the exhaust gas for the conventional turbocharger. This operating principle makes it possible to design the conventional turbocharger more specifically for high charge pressures and consequently for high engine power – the eTurbo consistently assures spontaneous response and powerful sprints from low engine speeds.
The effect is impressive. The 2.5 TFSI engine builds up its tremendous power without any perceptible delay. This power is available in any situation – whenever the accelerator pedal is pressed. In an acceleration duel, the TT clubsport turbo effortlessly pulls away from a counterpart with an equally powerful engine but no electric biturbo.
Power storage: the 48-volt electrical system
However, it is not just the power of the five-cylinder engine that is fascinating – so is its unmistakable throaty sound. The exhaust system is designed for minimal back-pressure; a side pipe to the ambient air is located immediately after the racing-type muffler. The 2.5 TFSI engine is cooled by a racing-type radiator. In the lower engine speed range, the electrically driven compressor boosts torque by up to 130 Nm (95.9 lb-ft). A dedicated 48‑volt electrical sub-system – another key future technology from Audi – supplies electrical energy to the turbocharger. A compact lithium-ion battery in the luggage compartment stores the energy generated by recuperation when coasting. A DC/DC converter provides the connection to the 12-volt electrical system.
The power of the Audi TT clubsport turbo reaches the road impressively via a quattro permanent all-wheel drive system with its multi-plate clutch mounted on the rear axle for better weight distribution. A coilover suspension system enables highly precise adjustment of the body’s ride height and the compression and rebound of the shock absorbers. An electric lifting function protects the equipment from damage by street curbs. Electronic stabilization control (ESC) and torque vectoring perfectly round out the dynamic qualities of the suspension.
The show car’s wheels are size 9.5 J x 20. Their six twin-spoke design is finished in a two-color look – both in gloss turned finish and matt black – and the tires are size 275/30. Carbon-fiber ceramic brake disks are mounted behind all four wheels; they are very lightweight and wear-resistant. The front brake disks measure 370 mm (14.6 in) in diameter.
Another 14 centimeters wide: spectacular add-on parts
The compact sports car takes a full stance on the road with track widths of 1,736 mm (5.70 ft) in front and 1,729 mm (5.67 ft) at the rear. The car is 4.33 meters (14.2 ft) long and 1.97 meters (6.5 ft) wide, including the side mirrors – 14 cm (5.5 in) wider than the technical platform upon which it was based. Its angular fenders contribute their own, built-up shape to the car body. They take the characteristic design motif of the Audi TT to an extreme and accentuate the distribution of engine power to all four wheels – the quattro drive. The fenders of the show car – painted in the exterior color Ferro Titanium – are open at the front and rear. Air from the car’s slipstream flows through them to cool the brakes. The Singleframe grille and large air inlets – whose vertical fins continue the signature theme of the Matrix LED headlights – are also optimized for maximum air throughput.
The manually adjustable rear wing is an advanced development of the Audi Sport TT Cup, with which the brand very recently launched a dedicated race series. It is now 20 cm (7.9 in) wider, and the side flaps, which feature the four rings, were given a new geometry. The wing consists of carbon fiber-reinforced polymer (CFRP) as do all other add-on parts: the air inlets and the large splitter at the front, the side panels and side sill trims as well as the voluminous diffuser at the rear whose lateral segments reference the motif of the air inlets.
The interior: completely focused on the sporty driver
A protective “cage” of ultra-high-strength titanium tubes makes the rear zone of the interior even more rigid and safe. In front, there are lightweight racing bucket seats with four-point harnesses. The display and operating concept with the digital Audi virtual cockpit focuses on the driver, who can control all key driving parameters by using the four satellite buttons on the multifunction steering wheel.
Sporty materials such as CFRP and black Alcantara define the interior of the Audi TT clubsport turbo. The racing bucket seats are upholstered in coral orange Alcantara and feature contrasting stitching and piping. CFRP parts with their large surfaces create sporty accents on the doors and center console, and the doors are closed by pulling on a tube-shaped grip with an Alcantara inlay. The air vents and gear shift also have coral orange accents – the aluminum gear shift lever travels in an open shift gate.