TDI

TDI (Turbocharged Direct Injection) is the name of diesel engines designed by the Volkswagen Group, provided with a turbocharger and a cylinder-direct fuel injection system. The power units are noted for a good fuel economy and high efficiency. The TDI engines are used in vehicles of such brands as Volkswagen, Audi, Škoda, Seat, Porsche.

The TDI engine was first introduced in 1989. It was installed on Audi 100 C3. The first generation TDI engines were equipped with an electronically controlled fuel injection pump from Bosch. The first power unit had 5 inline cylinders and 2.5 litre volume. Its power was 120 hp and the maximum torque was 265 Nm.

The second generation TDI power units were introduced in 1998. The distinguishing feature of these engines was a unit injector that replaced the common design with injectors and a fuel injection pump. In the system with unit injectors the pressure was adjusted for each cylinder separately unlike the direct injection system with a single fuel rail. The first upgraded TDI engine was installed on Volkswagen Passat B5. The power unit had a 1.9 litre volume and a 115 hp power.

The production of the third generation TDI engines started in 2004. Starting with this generation engineers used the common rail direct injection system. The power units were notable for high efficiency, power, eco-friendliness and economy. The TDI engines have become popular and have been used in various vehicle models.