How Variable Geometry Turbos Work

How Variable Geometry Turbos Work

Mon, Feb 27, 2023

A variable geometry turbocharger (VGT) is a type of turbocharger used in diesel engines. It has a turbine with vanes that can be adjusted to change the angle of the blades. This allows for more or less air to be directed through the turbine, which affects how much boost is produced. VGTs are used in order to improve engine performance and fuel economy. In this blog post, we'll take a look at how VGTs work and how they benefit diesel engines.

What is a Variable Geometry Turbo (VGT)?

A Variable Geometry Turbo (VGT) is a type of turbocharger that is used to boost engine performance. This technology utilizes vanes on the turbo housing, which change the angle when the exhaust gas flow passes through them, controlling the power output of the engine. This adjustable vane system allows for variable turbine and compressor configurations, meaning more air can get pushed into the engine and result in higher horsepower. 

VGTs also come with distinctive sound profiles, as they are able to produce small amounts of backpressure that create a smooth performance with lower frequency than traditional turbochargers. In addition to performance benefits and tunable sounds, VGTs are designed with wastegate systems that help reduce fuel consumption, resulting in longer engine life.

How Does a VGT Work Differently from a Regular Turbocharger?

Variable geometry turbochargers (VGTS) are a relatively new technology compared to regular turbochargers, and they differ in the way they are able to adjust the engine's power output. Where regular turbochargers use stationary vanes to control exhaust pressure, VGTS utilize moveable vanes so that the turbine can respond faster and enable better performance even at lower speeds. These adjustable blades create a variable-geometry exhaust passage, where the size and shape of the passageway can be adjusted dynamically according to various feedback signals from the engine. 

As a result, VGTS allow for improved performance during rapid acceleration as well as increased fuel economy when idling or operating at low speeds. While there may be some additional capital costs associated with costly VGT hardware compared to regular turbos, these efficient systems have become more commonplace in modern diesel engines due to their numerous benefits when it comes to both efficiency and raw power.

What are the benefits of having a VGT on your engine?

The most notable benefit of having a VGT on your engine is increased fuel efficiency. Since the vanes can be adjusted to better match the exhaust passage with the engine's speed, more air can be efficiently pushed into the combustion chamber, resulting in more power and better fuel economy. Additionally, since VGTs are able to precisely control back-pressure and reduce turbo lag, they offer a smoother driving experience with less noise and vibrations. 

In addition to these performance benefits, investing in a VGT also provides you with improved durability as well as lower maintenance costs due to fewer parts needing replacement or repair over time. Overall, variable geometry turbos provide numerous advantages for diesel engines; from improved fuel efficiency and performance to enhanced engine life span and lower maintenance costs.

How Do You Know if You Need a VGT or Not?

Whether you need a VGT depends on several factors, including your engine's specifications and performance goals. Generally speaking, if your engine is designed to deliver high power output and improved fuel economy, then it may benefit from a VGT upgrade. Additionally, if the vehicle's intended purpose involves frequent acceleration and deceleration (for example driving in stop-and-go traffic), then installing a VGT will help ensure smoother operation. 

If you're unsure whether or not investing in a VGT is the right choice for your engine, it's best to consult with an experienced mechanic who can evaluate your specific needs before making any decisions.  

Are There Any Drawbacks to Having a VGT on Your Engine?

Installing a Variable Geometry Turbocharger (VGT) on your engine can certainly improve your engine’s overall performance, but it's important to note that there are certain drawbacks as well. For starters, they require regular maintenance to ensure they don't get clogged up with dirt and dust, which can reduce their efficiency. Additionally, VGT systems are generally more expensive than standard wastegate turbos and could be cost-prohibitive for some auto enthusiasts. 

Even if you can afford one, the installation process tends to be arduous and time-consuming with extra components such as an EGR system that may need to be fitted or modified. Furthermore, VGTs often generate more noise than their counterparts due to the fact that the turbo shaft must rotate at higher speeds in order to amass its maximum potential output. Overall, while having a VGT adds great power and torque gains to your engine, it's important to be cognizant of the potential drawbacks before making any decisions.

Summing Up

Variable geometry turbochargers (VGTs) are a type of turbocharger that can improve the performance of your car engine. VGTs work differently from regular turbochargers by varying the size of the turbine nozzle, which allows for more efficient airflow into the engine. There are several benefits to having a VGT on your car engine, including increased power and torque, improved fuel economy, and reduced emissions. You can usually tell if your car has a VGT by looking for a small actuator motor on the side of the turbocharger housing. While there are many benefits to having a VGT on your engine, there are also some drawbacks to consider before you decide to upgrade your TurboCharger.

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Reimer Tuning is proud to have Agco Power’s Core engine platform in its lineup of products, offering customers another excellent option for their industrial needs. With the Core engine platform, customers can anticipate improved performance, greater efficiency, and reliable operation - all at a competitive price. Contact us today to learn more about how we can help you get the most out of Agco Power’s Core engine platform.  With years of experience and a vast selection of products, Reimer Tuning is committed to providing its customers with the best solutions available.


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