What is Turbocharged Direct Injection (TDI)?

Published: 18th October 2010
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An explanation of Turbocharged Direct Injection (TDI), how it works, its advantages and disadvantages.



Many people believe that turbocharged direct injection is the saviour of diesel engines. There is also the belief that cars that feature turbocharged direct injection engines are one of the most interesting engines available.





Turbocharged direct injection engines feature some of the same benefits of a petroleum engine without actually sacrificing the low cost of fuel. These features include engine power and fuel efficiency.





In addition, turbocharged direct injection engines are more environmentally aware. Although TDI engines are more refined and cleaner than old diesel engines, they are different from petrol cars.





How A Turbocharged Direct Injection Engine Works




A turbocharged direct injection engine features direct injection. A fuel injector sprays fuel that has been atomized into the main combustion chamber of each cylinder of a car's engine. Old diesel engines used to spray the fuel into the pre-combustion chamber.





A turbocharged direct injection engine also features forced induction to the turbocharger. This process increases the amount of air that is able to go into the engine's cylinders and the intercooler. This lowers temperature while increasing the density of the air.





In addition, this process also increases the amount of fuel that is injected into the main combustion chambers. This allows greater efficiency of the engine and greater power outputs.





The reason why a lot of people enjoy turbocharged direct injection engines is the fact that the engine has a lot of power while still decreasing gas emissions.





Examples Of Cars That Feature A Turbocharged Direct Injection Engine




Cars that use turbocharged direct injection engines include the Audi A3 TDI, the BMW 120d, the Chrysler 300C CRD and the Fiat Punto JTD. The price range for these cars can be anything between $23,000 and $58,000. However, a car with a turbocharged direct injection engine can cost up to $150,000.





Advantages Of The Turbocharged Direct Injection Engine




Turbocharged direct injection engines are not like other diesel engines. A TDI engine adds more boosts of power. It also has similar qualities to a petrol-based car. For example, a turbocharged direct injection engine has the same speed and fast gear changes of a petrol engine car.





Another positive feature of a turbocharged direct engine is the exhaust gas recirculation unit. This reduces pollution that is caused by petrol. The catalytic converters also reduce the amount of CO2 that is released into the air.





Many people also enjoy the fact that petrol for a car with a turbocharged direct injection engine is slightly cheaper than a petrol-based car. This also provides better performance for the engine.







Disadvantages Of The Turbocharged Direct Injection Engine




TDI engines take more time to make. This means that it will cost more money than a car that has a regular engine. It could cost as much as five percent more than a car that has a regular petrol engine. In addition, turbocharged direct injection engines still produce some forms of pollutant. For example, it produces nitrous oxide and bigger soot particles.







Freelance writer Hugh McInnes is a passionate lover of cars and keen industry observer. He is avidly watching the evolution of car manufacturing and improvements in engine technology as the world tries to beat climate change. He is currently reading as much as he can about TDI diesel engines and fuel efficiency as well as alternative power sources, such as cars made to be recharged using electricity.

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