3.0 TDI Biturbo
The biturbo is the crowning glory of the V6 diesel engine range. It has been modified in many details, including a sound actuator in the exhaust tract to generate sonorous sound. A switchover valve links the two inline turbochargers. At low revs it is closed, the small charger with its variable turbine geometry does most of the work, while the large charger does the pre-compression. From about 2,500 rpm, the valve starts to open and the small charger increasingly transfers the major share of work to its counterpart. In the range between 3,500 and 4,000 rpm, the valve opens completely, and only the large charger still operates. At launch, the V6 TDI biturbo produced 230 kW (313 hp) of power and developed 650 Nm (405.66 lb ft) of torque.