Press Release
Page 1 - Six-Cylinder TDI & Diesel Particulate FilterPage 2 - Six-Cylinder TDI & Diesel Particulate Filter (cont.)
Page 3 - All-wheel Drive - Chassis with Decoupling Stabilisers
Page 4 - Interior and Standard Equipment
Page 5 - Touareg Individual
Page 6 - Travelling Feature - Mobility for Globetrotters
Page 7 - Motor Sport Feature - Race Touareg for the Dakar Rally 2005
New Six-Cylinder TDI with Particulate Filter as Standard
- 225 h.p. V6 TDI develops a powerful 500 Newton metres
- Touareg V6 TDI tows trailers weighing up to 3500 kilograms
In the V6 TDI version, the Touareg with its standard six-speed manual gearbox achieves a maximum speed of 203 km/h (six-speed automatic: 201 km/h); the average consumption is 10.6 litres diesel per 100 kilometres (automatic: 10.9 litres). Equipped with a diesel particulate filter at no extra cost, the Touareg V6 TDI complies with the Euro-4 emissions standard.
The new six-cylinder engine:
Touareg V6 TDI is the first off-roader with piezoelectric technology
Direct injection with piezoelectric technology represents the technical highlight of this engine. The TDI develops a maximum torque of 500 Newton metres practically from stationary (from 1750 rpm). The engine is equipped with a fast glow system featuring ceramic glow plugs to enable the car to be started in winter just as quickly as a petrol-engined version. The V6 TDI for the Touareg has been significantly modified for off-road use compared to the derivative also available in the Phaeton: The six-cylinder unit arranged directly over the front axle in the off-roader features, amongst other items, a modified oil circuit that ensures complete functional reliability even at the most extreme vehicle inclinations.Powerful thrust even in the low rpm range: One of the most important characteristics of the V6 TDI - acclaimed by many experts as the most modern diesel in the world - is its "powerful thrust even in the low rpm range". This thrust at low revs creates the particular appeal of this TDI even in the large off-roader. It sets it apart from all six-cylinder petrol engines with a comparable cubic capacity. In comparison, it is not so long ago that achieving 500 Newton metres torque was the exclusive preserve of high-performance sports cars with at least eight combustion chambers.
In the case of the Touareg, the 500 Newton metres torque provides for driving pleasure over every metre you drive. In off-road conditions, the peak torque that is available at practically all times gives assistance in situations such as when setting off on extreme inclines. On-road, in contrast, the engine offers spontaneous torque delivery and a pleasantly low noise level. Furthermore, it can be recommended as the ideal ingredient for a classic towing vehicle such as the Touareg (3500 kilo trailer weight, braked at maximum 12 percent incline).
Compact and light: The new V6 TDI engine is 440 millimetres long, meaning that it is extremely compact. The cylinder crankcase features an angle of 90 degrees and is made from high-strength yet light vermicular graphite cast iron (GGV). This offers 100 percent greater strength although it weighs 15 percent less than grey cast iron. The engine weighs only 220 kilograms; its cylinder gap is 90 millimetres and the compression ratio is 17:1.
Runs as smoothly as a petrol engine: The 24 valves of the sixcylinder engine are actuated using low-friction roller finger followers with hydraulic valve clearance compensation; this technology, together with the piezoelectric function, makes a decisive contribution to reducing consumption and exhaust emissions. Together with the new common rail system and the highstrength construction of the cylinder crankcase, using roller finger followers makes a positive contribution to the engine acoustics. Specifically, in conjunction with the clamped and therefore practically play-free camshaft timing gears, this makes it possible to reduce the mechanical noise of the valve train - a fundamental prerequisite for the excellent smooth running of the V6 TDI that is every bit as refined as a six-cylinder petrol engine.
1600 bar injection pressure: Mixture preparation is handled by a common rail system of the latest design: the Bosch CRIP II+. It consists of a high-pressure pump (up to 1600 bar injection pressure), one common rail per cylinder bank, the low-pressure system with primary pump and filter, piezoelectric injectors and an electronic control unit together with sensors. The injection pressure is very high for a common rail engine, meaning that the fuel is atomised more finely; this allows the mixture preparation to be optimised further and permits more efficient combustion. The consequences are both palpable and measurable: Power (kW) and torque (Nm) are also significantly increased while consumption and exhaust emissions are lowered.
Piezoelectric technology instead of solenoid valves: The piezoelectric injectors play a key role in the newly designed common rail system. Background: Until now, the injection moment and the injector duration have been controlled by electronically regulated solenoid valves for each cylinder in the injectors. As a world first, the job previously performed by the solenoid valves is now undertaken by piezoelectric inline injectors in the V6 TDI. These switch much faster than solenoid valves.
In these new injectors, the injection valves are controlled by a component referred to as a piezoelectric actuator. It comprises piezoelectric crystals that change their structure when an electric voltage is passed through them, causing them to expand. This results in a minimum geometrical change that - assisted by a hydraulic element - mechanically triggers the opening of the injection nozzle needle.
