Pump-injector injection system: ultra-high pressures for maximum efficiency

The high-pressure pump-injection system achieves the highest injection pressures currently available in any direct-injection process. The associated fine atomisation of the fuel ensures that a high degree of thermodynamic efficiency is attained and the highest specific torque per litre is at the driver's disposal. This system also permits controlled pilot injection as a means of ensuring low engine noise levels and minimum emissions.

The 85 kW (115 bhp) A4 1.9 TDI develops the most remarkable peak torque of 285 Nm at 1900 rpm and is therefore always exceptionally flexible. It accelerates from 0 to 100 km/h in 10.5 seconds and, with a manual-gearbox fitted, can exceed the 200 km/h mark on the way to its top speed. Total fuel consumption according to the 93/116/EC test method will be in the region of 5.3 litres per 100 kilometres.

This new engine will gradually supersede all transmission versions of the existing 1.9-litre TDI with rotary-piston injection pump, which develops 81 kW (110 bhp).

As the largest TDI engine in the A4 programme, it will have to perform the important role of TDI standard-bearer, and will certainly be capable of setting new standards in terms of consumption and power flow.