A Complete Guide for Diesel Turbo Engine

The efficacy and performance of a vehicle depend on its engine. Therefore, the turbochargers have an important role to play in it. Diesel turbochargers are known as turbos, which are a forced induction device that increases internal combustion, thereby increasing the engine’s power by forcing the compressed air to move into the combustion chamber promoting more fuel occupation, thereby higher power. We’ve all heard of diesel turbo engines, but do you have a good understanding of how they work? In this guide, we’ll help you get familiar with turbochargers so that you can get to know the fundamentals of naturally aspirated engines.

Key components of diesel turbo:

A diesel turbocharger is a component that combines a turbine and an air compressor. Both have a defined role to play. Both these components have few other components:

  • Turbine: It comprises turbine housing and a turbine wheel. The turbine housing directs the exhaust gas to the turbine wheel. This gas then turns the wheel, and then the gas moves out from the turbine housing via the exhaust outlet area.  
  • Compressor: The next important component of diesel turbochargers is a compressor which has two components compressor wheel and compressor housing. The functioning of the compressor is the opposite turbine. The compressor is attached to the turbine with a forged steel shaft. When the turbine turns the compressor wheel, it draws the air in and compresses it. The compressor housing converts this high-speed and low-pressure air into high-pressure air through the process of diffusion. This compressed air leads to more combustion of fuel which generates more power and thus providing more efficiency.

What Are Their Functions?

A shaft with a turbine wheel on one end and a compressor wheel makes up a turbo. A snail-shaped housing protects these with an inlet port from which high-pressure waste exhaust gases enter. The turbine spins as the air flows through it, and the compressor turns with it, pulling in massive amounts of air compressed and released through the outlet port.

An intercooler cools the compressed air until it enters the cylinders, and a pipe feeds it back into the cylinders. Since diesel turbo spin at such high speeds (up to 250,000 RPM), an oil cooling system is usually used to keep them cool. 

What Are the Advantages of Diesel Turbo?

Diesel turbochargers have several advantages, which is why they’re so popular in modern vehicles. We’ve compiled a list of the key benefits of a turbocharged engine.

In the same sized engine, turbochargers produce more power. This is because each piston stroke has more power than in naturally aspirated engines. As a result, smaller, turbocharged engines are increasingly being used to replace bigger, less efficient engines in automobiles. The diesel turbochargers are highly efficient, and it converts 50% of the energy is converted into power.

  • Performance and Torque: Turbochargers produce more torque even on the smallest engines, particularly at lower revs. As a result, cars have powerful, nimble efficiency, which is excellent and makes the engine feel more refined at higher speeds on highways and roads.
  • Offers good mileage: Another benefit of turbochargers is that it offers better mileage. It can deliver 25% to 30% more mileage than a patrol car. Thus, making diesel car more efficient than the petrol one.
  • Efficiency of diesel turbo: Another reason that makes turbochargers more efficient is that it doesn’t need an ignition system that requires high voltage, so there is no probability of failure due to lack of spark. Also, turbochargers engine doesn’t emit high-frequency radiation, which can intervene with the electronic system of the vehicle.
  • Lesser heat production: What makes diesel engines more efficient is that it doesn’t emit much heat. Thus there is a lesser risk of machine damage because of high heat.
  • Safer option: Everyone wants to have a safe ride, and hence the role of the engine cannot be undermined. With diesel engines, there is no risk of combustion and hence is considered to be a safer option.
  • Durability: What makes diesel engine far more efficacy is because it is highly durable. The diesel engine has a reputation for long life as compared to the petrol ones. Besides, they are environment friendly. The diesel engine produces a lesser amount of carbon monoxide, which makes it a more favoured option as compared to the petrol engines.

What are the Drawbacks of the Diesel Turbo Engine?

While diesel turbo is becoming increasingly common. They have numerous benefits that make them one of the most popular choices amongst the vehicle owner, but they do have drawbacks that you should be familiar with. For your better evaluation, we’ve mentioned some points below-

  • Repairs Are More Expensive: Turbochargers add complexity to an engine since they are surrounded by a slew of other components that may malfunction or develop faults. These issues can be costly to fix, and if they fail, they can affect other components.
  • Turbo Slowness: Turbo lag is a brief pause in response after pressing the throttle when the engine produces insufficient exhaust gas to quickly spin the diesel turbo intake turbine. Only when the car is pushed aggressively or from a closed throttle position does this happen. Manufacturers of high-performance cars avoid turbo lag by using two turbochargers with different geometries rather than one large one with only one turbine.
  • Driving Style vs Efficiency: A turbocharged engine’s quoted efficiency figures need careful throttle control, with the accelerator not pressed too hard. When a turbocharger is turned on, the cylinders burn fuel faster, resulting in low performance. When switching from a naturally aspirated to a turbocharged vehicle, drivers can change their driving style to maintain good performance, especially at the time of getting started.


In Australia’s four-wheel-drive fleet, the diesel turbo engine is very popular. Toyota, Nissan, Land Rover, and Mitsubishi all have new turbo diesel 4X4 models on their showroom floors. Turbo diesel automobiles are also becoming more popular. BMW, Lexus, Jaguar, Mercedes-Benz, and Peugeot are only a few significant names in car manufacturing that produce high-performance luxury cars with turbo diesel engines that can reach speeds of over 220 km/h.