How Variable Geometry Turbochargers (VGT) Work

VGT turbochargers, or Variable Geometry Turbochargers, are a type of turbocharger used in modern diesel engines. These turbochargers are designed to provide better performance and fuel efficiency than traditional turbochargers, which are fixed-geometry units.

In this blog post, we'll take a closer look at VGT turbochargers and how they work.

What is a Turbocharger?

Before we get into VGT turbochargers, it's important to understand what a turbocharger is and how it works. A turbocharger is essentially an air compressor that increases the amount of air going into an engine. This allows the engine to burn more fuel and produce more power.

A turbocharger works by using a turbine to compress air and force it into the engine's intake manifold. The turbine is driven by exhaust gases from the engine, so it doesn't require any external power source. This is why turbochargers are often used in diesel engines, which produce a lot of exhaust gas.

What is a VGT Turbocharger?

A VGT turbocharger is a type of turbocharger that has adjustable vanes in the turbine housing. These vanes can be adjusted to change the angle of the exhaust gas flow, which in turn changes the speed and pressure of the turbine.

The key advantage of a VGT turbocharger is that it can provide boost at lower engine speeds, which helps to reduce turbo lag. Turbo lag is the delay between when the accelerator is pressed and when the turbocharger provides boost. This delay can be frustrating for drivers, especially in situations where quick acceleration is needed.

How Does a VGT Turbocharger Work?

A VGT turbocharger works by adjusting the angle of the turbine vanes to control the speed and pressure of the exhaust gas flow. When the vanes are opened, the exhaust gas flows more freely through the turbine, which increases the speed of the turbine and provides more boost.

Conversely, when the vanes are closed, the exhaust gas flow is restricted, which slows down the turbine and reduces boost. By adjusting the vanes, the turbocharger can provide boost at lower engine speeds, which helps to reduce turbo lag.

Benefits of VGT Turbochargers

There are several benefits to using VGT turbochargers in diesel engines:

  1. Reduced Turbo Lag - VGT turbochargers can provide boost at lower engine speeds, which helps to reduce turbo lag.

  2. Improved Fuel Efficiency - By providing boost at lower engine speeds, VGT turbochargers can improve fuel efficiency by allowing the engine to operate at lower RPMs.

  3. Increased Power Output - VGT turbochargers can provide more boost than traditional turbochargers, which can increase power output.

  4. Reduced Emissions - By improving fuel efficiency and increasing power output, VGT turbochargers can help to reduce emissions.


At Turbo Bits, we understand the importance of VGT turbochargers in modern diesel engines. Our high-quality turbochargers provide a range of benefits, including reduced turbo lag, improved fuel efficiency, increased power output, and reduced emissions. With adjustable turbine vanes, our VGT turbochargers can control the speed and pressure of the exhaust gas flow, allowing for boost at lower engine speeds. If you're looking to improve the performance and efficiency of your diesel-powered vehicle, trust Turbo Bits to provide top-of-the-line VGT turbochargers.