baileys diesel injectors

Modern Diesel Engines and Exhaust Systems

600 300 Brooke Hamilton

600x300_exhaustThe exhaust system is a crucial part of any vehicle. One of the biggest challenges car owners and enthusiasts face is increasing their engine’s performance. And one way to make an engine more efficient is by upgrading its exhaust system. Many cars manufactured after 2005 might need a tune up or an upgrade of the exhaust system. For upgrading the exhaust system on modern common rail diesel engines, it is preferable to go to an experienced company. As modern engines vastly differ from their older counterparts, it would require someone with experience and technological know-how to tune your car’s exhaust system.

The Early Scenario

Previously, a bit bigger, better flowing exhaust system would give you a slightly better turbo response along with better fuel efficiency and better power potential. It would also give better power straight out of the gate without the need to retune. However, the modern systems run very differently.

The Present Scenario

In the case of modern engines, the biggest difference is the move to entail variable geometry turbo. This means that the way the turbo regulates boost pressure is quite different from the old system. It also means that it is somewhat dependent on the back-pressure of the exhaust. In the case of the new common rail engines, they actually have very specific features for that application with a setup. Therefore, if you change the exhaust system you inherently change the environmental operation or operational environment, which could lead to more problems down the track.

Engine Tuning

Another marked difference is in the way the engines are tuned. In modern times, the engines are tuned even if there is a slight net efficiency gain in terms of the engine performance. The modern engines have so many sensors, which can read and see what is happening with the pressures in manifold air-flows, intake temps and the like. These signals are processed thousands of times in microseconds to ensure that the vehicle is running at its optimum efficiency. It also helps in keeping the emissions at acceptable levels. Hence, in reality, the engine will detune itself to be exactly the same as what it always was. As a result, the modern engines would not show any difference in performance whatsoever when you put an exhaust on to it. It is important to keep this in mind while dealing with performance applications.

Why Tune the Engine?

Therefore, the question is, why use an upgraded exhaust at all if there is no difference in performance? For instance, you can put a three-inch exhaust in your car. The exhaust temperatures might be a little lower as it removes the heat faster and more efficiently. It might not lead to dramatic performance gains. Although it is purely a personal choice, it could be beneficial to tune the engine.

Well, the function of the tuning box is to intercept the signal between the ECU and the common rail injection system to allow it to inject the perfect amount of fuel into the cylinders to produce more torque and power. As a result, the engine runs more efficiently, and the fuel consumption improves, as you will need lower throttle positions for similar conditions.


It is essential that when you are dealing with exhausts and upgrades, engine tuning or other modifications in general, you choose the right company to partner with. This would ensure that the right outcomes are achieved the first time around.