|Ingolstadt, January 14th, 2000
For Audi A4 and A6 - Dynamic duo of diesels
Two new TDI power units have extended the range of engines available for Audi A4 and A6 models:
The A4 can now be ordered with an 85 kW, 1.9 litre four-cylinder engine with pump-injector fuel injection system. By virtue of its peak torque of up to 310 Newton-metres (as quattro with 6-speed gearbox), it is among the most dynamic cars with engines in this category.
The most powerful (132 kW) and sporty version of the familiar V6 TDI, with a displacement of 2.5 litres, is now available for the A6. With an output per litre of 53 kW, this Audi engine sets a new world record for a production diesel engine.
V6 TDI: high-tech for ample torque
The high-performance V6 turbodiesel extends Audi's tradition, dating back to 1989, of pioneering achievements in the field of TDI technology. The very first turbodiesel direct-injection engine, with an output of 88 kW, likewise had a displacement of 2.5 litres and inaugurated the successful tradition of TDI engines on the Audi 100. But apart from their capacity, the trendsetting original TDI and its innovative descendant have little in common. The 132 kW engine, with its 4-valve technology with central injection-nozzle location, turbocharger with electronically controlled variable turbine geometry (VTG) and ultramodern radial-piston distributor-type injection pump, represents the state of the art in TDI engine design.
The new engine is based on the 110 kW V6 TDI, also a 2.5 litre engine, which will continue to be available. A large number of components have been radically modified by Audi's engineers in order to produce this higher power output. The injection pump, turbocharger, and water and oil cooling systems have all been modified. The 132 kW engine in addition now has special connecting rods and pistons.
These measures not only raise its specific output, they also significantly boost its torque. Substantial torque of 370 Newton-metres is available across the range from 1500 rpm to 2500 rpm: an ideal basis for lusty acceleration at engine speeds only slightly higher than idling, and excellent low-end torque across a wide range of engine speeds.
In the sprint discipline, the 2.5 TDI races from 0 to 100 km/h in less than 9 seconds, and continues in impressive style up to a top speed of 223 km/h. Performance data that give the A6 2.5 TDI the calibre of a sports car, except when it comes to fuel consumption: in this respect, the Audi A6 2.5 TDI with 5-speed tiptronic as standard and front-wheel drive is laudably abstemious, needing only 8.1 litres of diesel fuel (overall fuel consumption acc. to 93/116/EC) per 100 kilometres. A single tank of fuel is consequently enough for a distance up to 900 kilometres. A further point in its favour is that all transmission versions of Audi's most powerful TDI engine satisfy the EU III exhaust emission limits.
The new engine will be available on both the A6 saloon and the Avant version. Prices range from DM 68,000 (A6 saloon 2.5 TDI with tiptronic and front-wheel drive) to DM 75,760 (A6 Avant 2.5 TDI quattro with tiptronic). The front-wheel-drive A6 versions with the 132 kW TDI engine are available exclusively with tiptronic transmission; the quattro models can in addition be supplied with a 6-speed manual gearbox.
1.9 TDI: performing well under pressure
On the Audi A4, the 85 kW TDI engine is replacing the 81 kW version with the same displacement (1.9 litres). The main technical feature of the new engine version is the high-pressure pump-injector fuel injection system, capable of generating the highest pressure of any system currently in use. The technological input behind this achievement is enormous: there is a separate pump-injector unit, controlled by a solenoid valve, for each cylinder.
This arrangement makes an injection pressure of up to 2050 bar possible: a figure that corresponds to the weight of a midsize car being supported on an area the size of a finger nail. This pressure permits unparalleled torque values, while optimizing the already low fuel consumption. The most powerful version of the 1.9 TDI summons up 310 Newton-metres at just 1900 rpm - a figure that has until now been the preserve of six-cylinder engines with a much bigger displacement.
In conjunction with quattro four-wheel drive and a 6-speed manual gearbox, the A4 saloon accelerates from 0 to 100 km/h in only 10.9 seconds and achieves a top speed of 196 km/h. The engine performance of 85 kW is identical for the quattro and front-wheel-drive versions; the peak torque for the front-wheel drive A4 has been reduced slightly to a still impressive 285 Newton-metres. Its lower torque is not evident from its performance: the front-wheel-drive version with 5-speed manual gearbox actually outperforms the quattro by 4 km/h; it sprints from 0 to 100 km/h in a mere 10.5 seconds.
Equipped as it is with cooled exhaust-gas recirculation and a primary and main catalytic converter, the 1.9 TDI 85 kW likewise takes the challenge of fulfilling the EU III exhaust emission standard in its stride. And it demonstrates remarkable moderation when it comes to fuel consumption: the saloon front-wheel-drive version, with a 62-litre tank, needs only 5.3 litres of diesel per 100 kilometres (overall fuel consumption acc. to 93/116/EC). It is capable of covering distances of up to 1160 kilometres without the need for refuelling.
The price range for the Audi A4 1.9 TDI 85 kW extends from DM 47,000 (saloon with front-wheel drive and 5-speed manual gearbox) to DM 54,900 for the A4 Avant quattro with 6-speed manual gearbox. Production starts in January 2000.
Prices for Audi A4 / A4 Avant 1.9 TDI (85 kW) with pump-injector technology (incl. VAT.)
A4 1.9 TDI - DM 47,000 (EUR 24,030.72)
Prices for Audi A6 / A6 Avant 2.5 TDI (132 kW) (incl. VAT)
A6 2.5 TDI, tiptronic 5-speed - DM 68,000 (EUR 34,767.85)
The equipment items and technical data quoted refer to the model range available in Germany. Subject to alterations and errors.
|Copyright (c) 2000 AudiWorld|