Design, engineering and construction
The overriding theme in the design and engineering of the A2 was summarized by the then Audi UK product manager in an interview after the car won a design award in 2001 as "create a small Audi, not a cheap Audi",[6] and the creative brief is said to have been "Transport four people from Stuttgart to Milan on a single tank of petrol".[6]
The A2 is built with a considerable amount of aluminium and aluminium alloy, making it weigh significantly less than cars of this size, and use much less fuel than cars with traditional steel monocoques. Under certain circumstances, consumption for the 1.2 TDI model can be as low as just over 2 L/100 km. This version of the Audi A2 won the "Nordic Eco Run" fuel economy race in 2003, with a consumption of 2.62 L/100 km.[7] Even the normal versions with petrol engines are capable of 5 L/100 km. The A2 was also notable for being the first Audi model since the 1970s Audi 50 (type 86) and Audi 100 (type 43) not to be offered with its 'trademark' quattro four-wheel drive option. The A2 has a coefficient of drag of between 0.25 and 0.29, depending on the specific version.[8]
The A2 still uses a contemporary unibody construction, with significant elements of space frame principles,[9] and it is tagged by Audi as an 'Audi Space Frame' design. The outer panels of the body have little or no structural function – similarities exist with the original Renault Espace – and the space frame bears the forces working on the car. The frame uses casts and extrusions which are laser welded together to make the space frame. Improvements in shell stability, durability and stiffness, lower weight, and more interior space are results of its construction. "The A2, on the other hand, was designed as an aluminum car and the spaceframe has been optimized by parts consolidation, using large, cost-effective castings instead of aluminum stampings".[9]
Unfortunately, the cost of working with aluminium, particularly with small production runs, meant that the A2 was more expensive than other cars in its sector, competing with the A-class and losing. Much of the high production cost was due to so many parts not being "off the shelf" and being specifically optimized for the A2.[10] From Autobild in 2003: "The A2 is not one of the models with the highest return on investment". The same article quotes the sales figures for 2002 as being 20,000 in Germany against 80,000 for the A-Class and "...lots of money for a car that is only 3.8m long."[11]
Audi was the first manufacturer to try to incorporate lightweight building concepts using aluminium and associated alloys into a "mass market" vehicle. Previous efforts at using the Audi Space Frame were limited to the rather more expensive Audi A8. As a guide to the mass involved, the entire shell weighs so little that two people can easily pick it up, and the side panel over the doors including the A- and D-pillars weighs approximately 2 kg. A 2002 model A2 with standard equipment has a mass of 895 kg.
Interior
The A2 has a large interior space for the exterior dimensions, including a boot with 390 L of space when the rear seats are in place. This is significantly larger than the luggage space of the next model in Audi's range, the Audi A3. Due to the "sandwich"-type construction, similar again to that of the Renault Espace or the Mercedes A-Class, the floorpan has an upper and a lower portion. The space in the middle is used to house various components, such as the fuel tank and the engine's electronics. The rear passengers also benefit, as their foot space reaches into this sandwich space, creating a comfortable seating position even for tall rear seat passengers. This is in direct contrast to the comfort available on the rear bench of an A-Class. To improve the weight distribution of the vehicle, its battery is located inside the boot, under the floor.
The A2's interior was very upmarket in comparison with other superminis. In both the UK and Europe, there were several choices of seat material and colour, comprising the standard Cirrus cloth, optional Matrix cloth, optional Alcantara/leather, or full pearl Nappa leather seat coverings. Sport models received sport seats with electrically adjustable lumbar support as standard in jacquard satin cloth.
Service hatch (Serviceklappe)
The front of the car included an unusual design feature called the "Serviceklappe" in German – this translates to "service hatch" or "service panel". On early cars, this was a glossy black panel at the lower edge of the bonnet, where the radiator grille would normally be sited.
