TDI  

At Volkswagen, TDI refers to diesel vehicles with direct injection and turbo charging. TDI engines are characterised by high levels of tractive power (torque) and and very good performance yield. TDI is a registered trademark of Volkswagen AG in many countries.

How it works:
a turbocharger supplies the engine with fresh air, ensuring optimum filling of the cylinder. After compression, the diesel fuel is then directly injected into this using a nozzle at a very high pressure. Effective engine encapsulation also enables quiet operation.

See also:
Direct injection
Turbocharger