Despite the increased dimensions, the Audi A4 and A4 Avant weigh up to 120 kilograms (264.6 lb) less than the previous models – the base Avant 1.4 TFSI, which will follow soon after the initial market launch, weighs only 1,370 kilograms (3.020.3 lb) empty and without driver. With this lightweight construction, the body is one of the lightest in its class. It is 15 kilograms (33.1 lb)lighter than its predecessor, thanks to geometrical lightweight construction and an intelligent combination of materials.
The module cross member under the dashboard is made of extruded and sheet aluminum, while the front cross member is an extruded profile. On the new A4 Avant, the nodes in the upper ends of the D-pillars are made of die-cast aluminum and the tailgate is also aluminum.
The deep drawing of the tailgate in the press takes place with a device known as and intelligent tool: Laser sensors measure how the sheet metal behaves during the process; if necessary, electrically operated drawing aids make small adjustments to the press. This results in even higher precision in the magnitude of thousandths of millimeters.
The mounts for the front MacPherson struts are highly integrated aluminum castings. Compared with components made of sheet steel, which are welded together out of several parts, they reduce weight by a total of eight kilograms. This construction allows a very stiff connection between the upper ends of the struts and the car body, thus ensuring optimal conditions for driving dynamics.
In the new Audi A4 and A4 Avant, the hot-stamped components form the high-strength, crash-proof backbone of the passenger compartment. They strengthen the transition from the front of the car to the interior, the frontal area of the roof frame, the B-pillars, the door sills and parts of the floor. They constitute 17 percent of the body structure.
Peace and quiet on board: Audi sets the benchmark
With its excellent torsional rigidity, the bodies of the A4 and A4 Avant lay the foundations for highly precise handling and quiet in the car; the new A4 models surpass their competitors in this respect. Switchable engine mounts ensure exemplary comfort when the engine is idling. The sealing concept for doors and tailgate (on the Avant) is highly complex and an acoustic windscreen is standard equipment. As an option, Audi supplies acoustic glass for the front doors and tinted privacy glass is available for the rear doors.
The new Audi A4 and A4 Avant score top marks also for passive safety. In the interior, the adaptive occupant restraint system for the front seats offers outstanding protection. It adjusts the effect of the front airbags and the seat-belt force limiter to the sitting position of the driver and front-seat passenger and to the type of frontal collision.
*The fuel consumption and CO2 emission figures of all models named above and available on the German market can be found in the list on the last page of this basic information.