Tremendous thrust right from the start: the Audi Clubsport TT.

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. From May 13 to 16, Audi will be showing its technology concept car on the Wörthersee Tour in the Austrian town of Reifnitz. The inspiration for the show car came from the successful Audi 90 IMSA GTO of the late 1980s. A new technology is making its debut under the hood. The car's electric biturbo adds even more dynamism to the driving experience with its spontaneous response.

“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, the lat­ter from 3,000 to 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 one-half car lengths.

Electric thrust: Additional compressor fills turbo hole

An elec­tri­cally pow­ered com­pres­sor of­fers sig­nif­i­cant ad­van­tages: 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 e-turbo as­sures spon­ta­neous re­sponse and pow­er­ful sprints from low en­gine speeds at all times.

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 iden­ti­cally pow­ered en­gine but no elec­tric biturbo.

Energy 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 200 Nm (147.5 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 that is 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 whose multi-plate clutch is 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 round out the dy­namic qual­i­ties of the sus­pen­sion ide­ally.

The show car's wheels are size 9.5 J x 20. Their six twin-spoke de­sign is fin­ished in a bi-color look – both gloss turn fin­ished and matt black – and the tires are size 275/30. Car­bon-fiber ce­ramic brake discs are mounted be­hind all four wheels; they are very light­weight and wear-re­sis­tant. The front brake discs mea­sure 370 mm (14.6 in) in di­am­e­ter.

Widened 14 cm (5.5 in): spectacular add-on parts

The com­pact sports car takes a full stance on the road with track widths of 1,736 mm (68.3 in) in front and 1,729 mm (68.1 in) 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 a sep­a­rate ad­di­tive shape to the car body. They take the char­ac­ter­is­tic de­sign mo­tif of the Audi TT* to an ex­treme and ac­cen­t­ate 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 form a con­tin­u­a­tion to the light sig­na­ture 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 (CFRF) 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: fully focused on sporty drivers

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 race car 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 via 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 race seats are up­hol­stered in coral or­ange Al­can­tara and fea­ture con­trast­ing stitch­ing and pip­ing. In the doors and on the center con­sole, CFRP parts with their large sur­faces cre­ate sporty ac­cents, and the doors are closed by pulling on a tube-shaped grip with an Al­can­tara in­lay. The air vents and gear shifter also have coral or­ange ac­cents – the aluminum gear shift lever trav­els in an open shift gate.