Introducing VGTs

When it comes to turbocharging your engine, there are several options available to you. One of the most popular types of turbochargers on the market today are Variable Geometry Turbochargers (VGT). These turbochargers are designed to provide the benefits of both low-end and high-end turbochargers, making them a versatile choice for many drivers.

However, some people question the quality and effectiveness of VGT turbochargers, leading to the question, “Do VGT turbochargers suck or blow?” In this comprehensive guide, we will explore the pros and cons of VGT turbochargers and answer this question once and for all.

What is a Variable Geometry Turbocharger (VGT)?

A Variable Geometry Turbocharger (VGT) is a type of turbocharger that is designed to adjust the size of the turbocharger’s compressor wheel to match the engine’s needs. The VGT system uses a series of vanes that can be adjusted to control the size of the turbocharger’s compressor wheel, allowing for improved performance at low RPMs and higher boost pressures at high RPMs.

Pros of VGT Turbochargers

There are several benefits to using a VGT turbocharger in your engine, including:

Improved Low-End Torque

One of the biggest benefits of VGT turbochargers is improved low-end torque. Unlike traditional turbochargers, which can experience lag at low RPMs, VGT turbochargers can adjust the size of their compressor wheel to provide quick and responsive boost, improving low-end torque and acceleration.

Better High-End Power

In addition to improved low-end torque, VGT turbochargers can also provide better high-end power than a non-vgt equivalent due to the ability to have a larger turbine housing a/r with nozzles to also make it drive like a smaller a/r. As the engine RPMs increase, the VGT system can adjust the vanes to allow for lower backpressure, increasing the exhaust flow and backpressure, thus providing additional horsepower.

Improved Fuel Efficiency

VGT turbochargers also have the potential to improve fuel efficiency. The ability to adjust the size of the compressor wheel based on engine needs means that the engine can operate more efficiently, using less fuel and reducing emissions.

Cons of VGT Turbochargers

While there are several benefits to using a VGT turbocharger, there are also some drawbacks, including:

Complex Design

VGT turbochargers are more complex than traditional turbochargers, and their design can make them more prone to failures and more difficult to repair. The additional moving parts and complex control systems can also make maintenance more difficult and more expensive.

Increased Cost

Due to their complex design, VGT turbochargers are generally more expensive than traditional turbochargers. This can make them a less attractive option for some drivers, especially if they are working on a tight budget.

Restrictive Turbine Wheel

Even though the variable a/r ratio of the VGT turbo has many advantages, the small diameter of the turbine wheel still causes problems. To spool quickly, these usually have very small turbine wheels. And even though the a/r is variable you still need to get the exhaust out! The ultimate flow of the engine is limited by this. You will see this effect commonly on 997.1TT’s that hit a wall just over 700whp levels. Larger compressor wheels don’t help here either. They simply increase the backpressure more due to the huge difference in overall diameter of the wheels.

Final Thoughts

In conclusion, the answer to the question “Do VGT turbochargers suck or blow?” is a bit more nuanced than a simple yes or no answer. While VGT turbochargers have several benefits, including improved low-end torque and better high-end power, they also have some drawbacks, including a complex design, restrictive turbine wheels and increased cost.

Ultimately, the decision of whether to use a VGT turbocharger in your engine will depend on your individual needs and preferences. If you are looking for improved performance and are willing to pay the increased cost, a VGT turbocharger may be the right choice for you.

Looking for Upgrades?

Even with their cons, VGT’s are hard to beat on the street up to 700whp levels. A 997.1TT with 1100cc injectors, an E85 tune, Billet VGT turbo upgrade and a Protomotive X-pipe has brought many smiles to the drivers.