Volkswagen Touareg V8 TDI with extra-low NOx emissions

WOLFSBURG: Volkswagen has launched a new range of very clean diesel engines (TDI) on the market.

The TDI engines are characterised by extremely low nitrogen oxide emissions (NOx).

The Touareg V8 TDI, generating 310 kW (421 PS), is among the first Volkswagen to feature an exhaust purification system that filters nitrogen oxides at this low level: it emits between just 10 and 20 mg/km.

One test was carried out in the topographically flat federal German state of Lower Saxony while two further tests were conducted on routes in Baden-Württemberg and Bavaria that included differences in altitude.

The fact that the all-wheel drive Touareg V8 TDI reliably came in below the NOx limit in each of the tests – regardless of the route, differences in altitude and individual traffic volume – was particularly remarkable.

This positive result has been made possible by elements including multi-stage exhaust gas treatment featuring a very large NOx storage unit (capacity: 2.3 litres) with high-grade coating and SCR (selective catalytic reduction) with complex conditioning.

The SCR catalytic converter converts NOx to harmless steam and nitrogen using AdBlue (synthetic urea solution).

Like all Volkswagen TDI models, the Touareg V8 TDI also features a diesel particulate filter.

More new models featuring TDI engines that undercut the nitrogen oxide limits by generating minimum emissions will follow.