WORTH A SEE: The Audi TT Clubsport turbo concept will garner a lot of attention at the annual Wörthersee event in Germany. Image: Audi
• Five-cylinder electric bi-turbo
• Quattro all-wheel drive
• Premiere at Wörthersee fest
WÖRTHERSEE, Austria – Audi will showcase its TT Clubsport turbo concept which delivers a colossal 441kW/650Nm with the help of an innovative electrically driven biturbo compressor that is close to being production ready.
The concept features a stripped-out interior, wider stance and an outrageous rear wing reminiscent of the thoroughbred Audi 90 IMSA GTO race car of the late 1980's.
Wörthersee is the largest Audi and Volkswagen show in Europe and is held in the lakeside town of Reifnitz. 2015 marks the 34th Wörthersee with many enthusiasts making their way to Austria to enjoy the warm weather and see what the Teuton duo will unveil.
The car has a power-boosted 2.5 TFSI engine; the five-cylinder unit produces 441kW and 650Nm, the latter available from 3000-7000rpm. The result is a specific output of 176kW and 260Nm/litre.
Power is transferred through a manual six-speed transmission.
The car completes the standard sprint to 100km/h in a brisk 3.6sec and can keep on accelerating to 308km/h but plays out its big advantage over the first 16m as its electrically driven compressor boosts it to cover that distance in the first 2.5sec.
IMAGE GALLERY: 2015 Audi TT Clubsport Turbo Concept
Ulrich Hackenberg, Audi board member for technical development, explained: “The electric biturbo signifies a new dimension in driving enjoyment. It boosts sprinting ability and torque and enables high peak power.
"In our TDI engines, we are close to production readiness with this technology. We are now presenting it in a TFSI – the first automaker to do so. For our fans at Wörthersee, we've packaged the electric biturbo in a very sporty show car.”
The compressor offers numerous advantages, says Audi. It revs to maximum rapidly with little delay and continues to boost charge pressure when too little drive energy is left in the exhaust gas for a 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 e-turbo assures rapid response and powerful sprints from low engine speeds at all times.
Audi says the Clubsport benefits from a throaty five-cylinder thrum: the exhaust system is designed for minimal back-pressure and a side pipe to the ambient air is located immediately after the racing-type muffler.
The engine is cooled by a race-capable radiator and at lower engine speeds the electric compressor boosts torque by as much as 200Nm.
The car has a dedicated 48V electrical sub-system which supplies energy to the turbo. A compact lithium-ion battery in the boot stores the energy by recuperation when coasting. A DC/DC converter provides the connection to the 12V electrical system.
As with all powerful Audis, permanent all-wheel drive is mounted on the rear axle for better weight distribution. A coil-over-suspension system enables highly precise adjustment of the body’s ride height and the compression and rebound of the shock absorbers.
A nifty electric lifting function protects the car's equipment from damage by street kerbs and electronic stabilisation control and torque vectoring round out the dynamic qualities of the suspension.
The show car’s wheels are 9.5 J x 20, their six twin-spoke design finished in a bi-colour look – both gloss black – and the tyres are 275/30. Carbon-fibre ceramic brake discs are behind each of the four wheels; very light and wear-resistant. The front brake discs are 370mm in diameter.
Track widths are 1736mm front and 1729mm rear. The car is 4.33m long and 1.97m wide, including the external mirrors – 14cm wider than the technical platform on which it was based.
The wings of the show car – painted in the exterior colour Ferro Titanium – are open at the front and rear: the air from the car’s slipstream flows through them to cool the brakes. The single-frame grille and large air inlets – whose vertical fins form a continuation to the light signature of the Matrix LED headlights – are also optimised for maximum ventilation.
The rear wing can be adjusted manually and is an advanced development of the Audi Sport TT Cup. It is now 20cm wider and the side flaps, which feature the Audi rings, were given a new geometry. The wing is made of carbon fibre-reinforced polymer, as are all other add-on parts: the air inlets and the large splitter at the front, the side panels and sill trim and the voluminous diffuser at the rear whose lateral segments reference the motif of the air inlets.
A protective cage of ultra high-strength titanium tubes makes the rear zone of the interior even more rigid and safe. The driver and passenger are greeted by lightweight race car bucket seats with four-point harnesses.
The display and operating concept with an Audi digital virtual cockpit focuses on the driver, who can control all key driving parameters through four satellite buttons on the multifunction steering-wheel.
CFRP and black Alcantara define the cabin and the race seats are upholstered in coral-orange Alcantara with contrasting stitching and piping.
HIGH-STRENGTH TITANIUM AND ALCANTARA: The interior of the the TT Clubsport turbo concept has coral-orange lightt racing seats. Image: Audi