New Audi A2 1.4 TDI with 90 bhp Engine
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A light athlete with a high-tech heart
The Audi A2 1.4 TDI with 55 kW (75 bhp) engine will soon have a big brother: starting in November 2003, an uprated version of the A2 with a 66 kW (90 bhp) engine will join the programme, enlarging it to five engine versions in all. With a maximum torque of 230 Nm between 1900 and 2200 rpm, this compact three-cylinder unit accelerates the A2, a true 'light athlete' with an aluminium body, in 10.9 seconds from 0 to 100 km/h. This new top version in the Audi A2 model line has a top speed of 188 km/h and complies with the tough European EU4 exhaust emission limits.
The customer benefits in two ways: there is a tax concession until 2005, and in any case the car's fuel consumption is gratifyingly low, with a total test figure of only 4.3 litres of diesel per 100 kilometres.
The new engine owes its higher power output and torque primarily to a new turbocharger with variable turbine geometry and a boost pressure raised to 2.3 bar (absolute). The new charge-air intercooler, with a distinctly higher efficiency rating, also contributes to the 1.4-litre engine's higher performance, as does the optimised combustion chamber pattern. The compression ratio has been lowered to 18.0 : 1.
Further detailed work on the engine and its high-pressure fuel injection system has enabled Audi's engineers to comply with the most stringent emission limits currently valid worldwide.
Examples of their work are the electrically operated exhaust gas recirculation system, which now has an uprated cooling capacity and the shutoff flap in the intake manifold, controlled by the engine operating map, which helps to maintain the optimum combustion mixture. The pump-injector elements have a modified spray angle and increased flow capacity to suit the new operating situation.
There have been detail modifications to the entire pump-injector system. The new Bosch EDC 15 engine management with EOBD (European On-board Diagnosis) and separate pilot injection has injector elements of even higher precision and therefore exerts a positive effect on emission and noise levels.
The larger oil cooler and the new pistons with cooling oilway are a logical consequence of the more extreme temperatures likely to be encountered in this powerful engine. Screening measures on the intake manifold and cylinder block have achieved a distinct improvement in the three-cylinder engine's acoustic refinement.