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At Volkswagen, TDI identifies diesel-powered models with direct injection and a turbocharger. Characteristic features of the TDI engines are fuel economy, low emissions, high pulling power (torque) and outstanding power efficiency. TDI is a registered trademark of Volkswagen AG in many countries.
The operating principle: a turbocharger supplies the engine with fresh air, thereby providing optimum cylinder charging. After compression, the diesel fuel is injected directly into the cylinders at very high pressure through a nozzle. Effective engine encapsulation keeps noise to a minimum, and the combination of internal engine measures and exhaust treatment ensures excellent emission figures.