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The world’s first twin-clutch gearbox with seven speeds


Molsheim, November 08, 2004. Development of the Bugatti EB 16.4 Veyron – the high-performance sports car due to be launched in the second half of 2005 – is on track and progressing well. The prototype of the Bugatti Veyron once again attracted sustained interest from the media and general public at the International Geneva Automobile Salon this spring. The car is currently undergoing a 50,000 kilometre (30,000 mile) endurance test. Other endurance test cars will be following shortly. Engineers, technicians and quality assurance specialists are currently working intensively on the other development cars.
Bugatti Automobiles S.A.S. can also call on the expertise of the Volkswagen Group in terms of innovative technology – at the same time as continuing the pioneering technical spirit of Bugatti. For example, the Bugatti Veyron will be equipped with the “fastest” gearshift unit in the world: the DSG direct shift gearbox. Bugatti Automobiles S.A.S. is the first manufacturer ever to use the seven-speed variant of the DSG. The gearbox has been specifically developed for the new Bugatti Veyron sports car – a challenging application in which any other car gearbox would merely blunt its teeth: It can harness an engine torque of 1250 Newton meters*)!
The twin-clutch gearbox of the Bugatti Veyron combines the dynamic advantages of a manual gearbox with the convenience of an automatic to an as yet unparalleled level of perfection. One significant differentiation criteria compared to the classic automatic gearbox is that no torque converter is used as a moving-off element. Instead, the gearbox has a twin clutch that is composed of two wet-running multi-disc clutches.No other manufacturer outside of Volkswagen AG (to which Bugatti Automobiles S.A.S. also belongs) can currently offer a comparable gearbox technology. The DSG is already available in variants of the Golf, Touran, Audi A3, Audi TT, Skoda Octavia and Seat Altea.
The twin-clutch gearbox is arranged longitudinally ahead of the mid engine in the all-wheel drive Bugatti Veyron. The 736 kW (1001 hp) 16-cylinder engine itself is located directly ahead of the rear axle. Both the gearbox and the engine are designed as dry sump units – something that is particularly important in terms of achieving a lower centre of gravity. In order to distribute the power between the front and rear axles, Bugatti uses a Haldex transmission unit integrated behind the front-axle differential. The rear-axle differential also features a multi-disc transverse lock.
The DSG of the Bugatti Veyron impresses with its extremely short gearshift times and maximum gearshift comfort. The gearbox is shifted in manual mode using gearshift paddles behind the steering wheel or using a joystick-like lever in the centre console. It goes without saying that, even in fully automatic mode, the exemplary short gearshift times and incomparable gearshift method are still available.The seven-speed DSG in the Bugatti Veyron represents a new high point for this gearshift technology. Furthermore, the fact that the twin-clutch gearbox is used by Bugatti, Volkswagen, Audi, Skoda and Seat demonstrates that the Group is implementing cutting-edge technologies through all classes by means of cross-brand synergy effects. In the case of the DSG, this could be the start of a technical revolution.


Development of the high-performance sports car is on track


*) Gearbox: 7 Gear DSG, fuel consumption in town: 41.9l/100km, fuel consumption out of town: 15.6l/100km, fuel consumption combined: 24.9l/100km, CO2 emission combined: 596g/km, Efficiency Class: G
Annual tax for this vehicle €1132
Energy costs at a mileage of 20,000 km:
Fuel costs (Super Plus) at a fuel price of 1.624 EUR/billing unit €8087.52
Created on: 11/30/2011
The values were calculated using the prescribed measurement method (§ 2, numbers 5, 6, 6 per car energy labeling ordinance in its current version).CO2 emissions, which result from the production and provision of fuel or other energy sources are not taken into account in the determination of CO2 emissions pursuant to Directive 1999/94/EC. The figures do not refer to a specific vehicle and are not part of the offer, but only serve the purpose of comparing different vehicle types. The fuel consumption and CO2 emissions of a vehicle not only depend on the efficient utilization of the fuel by the vehicle, but also on driving style and other non-technical factors. CO2 is the main greenhouse gas responsible for global warming. Notice pursuant to Directive 1999/94/EC of each current valid version: For more information on official fuel consumption and the specific official CO2 emissions of new passenger cars can be acquired from the "Guide for Fuel Economy, CO2 Emissions and Power Consumption of New Passenger Cars" available at all sales outlets and at DAT German Automobil Treuhand GmbH, Hellmuth-Hirth-Strasse 1, D-73760 Ostfildern – available free of charge or at Efficiency classes of vehicles are evaluated in terms of CO2 emissions by means of the vehicle's empty weight. Vehicles that correspond to the average are classified as D. Vehicles that are better are graded with A+, A, B or C. Vehicles that are worse than the average are given an E, F or G.