10 Best Blow Off Valves – Reviews & Buying Guide
When tuning a vehicle for performance, you will often come across terms like the blow off valve or the turbo.
The turbo will feed the engine with compressed air in an optimal and efficient manner. This allows the engine to deliver higher performance that it normally would without a turbo.
However, having a turbo alone is not enough to get more horsepower from your vehicle. You also need to install a blow off valve.
The blow off valve or divergent valve serves only one purpose.
It evacuates any excess air pressure buildup before it reaches the engine. This allows the engine to burn fuel optimally without choking with an excess of air.
In the process of evacuating excess air, the blow off valve produces a distinctive whoosh sound that is commonly associated with a sports vehicle that has been tuned.
Below, we have reviewed some of the best blow off valves for the money. Let’s see which valve model you need to purchase for your car right now!
- 10 Best Blow Off Valves – Reviews
- 1. Turbosmart TS-0203-1061 Blow Off Valve
- 2. GFB 08-10+ WRX/05-09 LGT TMS Blow Off Valve
- 3. Boomba Racing Blow Off Valve
- 4. Greddy 11501665 Blow Off Valve
- 5. Turbosmart TS-0205-1009 Blow Off Valve
- 6. Turbosmart TS-0203-1022 Kompact Blow Off Valve
- 7. Turbosmart MS3 Kompact Blow Off Valve
- 8. TiAL Sport Q.11R Q Series Blow Off Valve
- 9. XS Power Mazdaspeed Blow Off Valve
- 10. TurboXS BOV-SML Blow Off Valve
- How to Buy the Best Blow Off Valve
10 Best Blow Off Valves – Reviews
1. Turbosmart TS-0203-1061 Blow Off Valve
2. GFB 08-10+ WRX/05-09 LGT TMS Blow Off Valve
3. Boomba Racing Blow Off Valve
4. Greddy 11501665 Blow Off Valve
5. Turbosmart TS-0205-1009 Blow Off Valve
6. Turbosmart TS-0203-1022 Kompact Blow Off Valve
7. Turbosmart MS3 Kompact Blow Off Valve
8. TiAL Sport Q.11R Q Series Blow Off Valve
9. XS Power Mazdaspeed Blow Off Valve
10. TurboXS BOV-SML Blow Off Valve
Easy to adjust and loud
Editor's Rating: (4.7 / 5)
The Turbosmart is a small and compact blow off valve that is reputed for its high-pitched whoosh sound when changing gear.
This model is very easy to install, and all you have to do is place it between the turbo system and your engine.
It will automatically take care of any excess air pressure that builds up inside and feeds your engine with an optimal amount of air.
Additionally, this model will fit a wide range of vehicles, and it comes with base holes that will allow you to securely fix it during installation.
Best, you can make adjustments to both the sound and amount of air pressure that it is to blow off.
All in all, the Turbosmart is one of the best turbo blow off valve that you can purchase if you want ease-of-use and adjustability.
This blow off valve is sensitive to pressure. You must ensure that the air pressure that enters this blow off valve is below 21 psi or it may start leaking over time
High-quality and very durable
Editor's Rating: (4.7 / 5)
If you need a blow off valve that will last you a long time, then this model is unbeatable in its build construction. It is made from a mix of metals that will not corrode and offer you a long lifespan.
Moreover, where this model shines are in its adjustment. You can adjust the sound as well as the air pressure using the hex screw located right on top of this blow off valve.
Installation is very easy, and this model comes with pre-drilled base holes that will allow you to mount it anywhere on your vehicle quickly and easily.
Due to the design of this blow off valve, it should be compatible with a wide range of vehicles.
If you are the type of person who likes to tweak your blow off valve, then this unit is one of the most adjustable models that you can purchase in this blow off valve review.
We highly recommend it!
Internal brass piston design for performance
Editor's Rating: (4.6 / 5)
What separates the Boomba from the rest of the competition is its small and compact form factor. Once installed in a vehicle, it does not take a lot of space.
Therefore, this blow off valve is an excellent choice for those who do not have a lot of space under the hood of their vehicle.
Since brass is a non-reactive metal, it will last a long time, even if this blow off valve comes in contact with oil or water. It will not rust or corrode.
Furthermore, the brass piston ensures that this valve is performing and reliable in the long term.
Most impressively, this valve has been tested to withstand a high air pressure of up to 70 psi.
This is extraordinary considering that most blows off valves have a tolerance value that is significantly less than 70 psi.
The high air pressure tolerance is most probably explained by the presence of the brass piston.
Universal fit for almost any vehicle
Editor's Rating: (4.1 / 5)
The Greddy is a popular blow valve that you will find in the vehicles of many car enthusiasts.
Not only is this blow valve high-performing, but it is also compatible with almost any type of vehicle on the market. This is mostly due to its universal inlet and outlet design and standard diameter.
Inside this blow off valve, you will find a silicone diaphragm controller that is heavy-duty and long-lasting.
Also, it sports an improved design over the previous model which offers better response times especially when you change gear in your vehicle.
This model also contains a CNC outlet that uses a special technology that amplifies the blow off sound without the need for additional air pressure.
But best, it uses the same mounting holes as previous Greddy blow off valves so if you are looking for an upgrade, then this model is definitely the best blow off valve for the money.
4 blow-off valves in 1
Editor's Rating: (5 / 5)
This Turbosmart has a unique design that makes it high-performing and heavy-duty. In fact, this particular dual port blow off valve contains 4 blow valves in 1.
This means that it will sound louder when compared to other models as well as able to cope with higher air pressure.
Adjustments like sound and air pressure are very easy to make with this blow valve, and any adjustments are clearly indicated at the top of the unit.
In addition, you get a gasket and a blanking plug with this purchase. As most blow of valves on the market, installation of this product is extremely easy, and there are base mounting holes for you to securely fit it on your vehicle.
If you happen to own a compatible Mazda or Subaru car, then this Turbosmart unit is one of the best sounding blow off valve then you can buy for your vehicle.
This blow of valve is mostly made for Mazda and Subaru cars and does not have a universal fit
Versatile and a high performance
Editor's Rating: (5 / 5)
Most people are looking forward to installing a blow off valve on the vehicle usually face a big problem. That is of incompatibility.
In fact, blow off valves usually, tend to be picky about the type of vehicle that they are installed on.
This is not a problem with this Turbosmart blow off valve because it is universally compatible with almost any vehicle on the market.
You will have absolutely no problem installing it and getting it to work right away because it has dual 25 mm ports.
Moreover, it has been internally designed in such a way that it provides your engine with a superior airflow as well as a better sound when you shift your gears.
The exterior build construction is superb as it is made from a metal that has been powder coated.
Of course, you can quickly and easily adjust the sound of this blow off valve by simply turning the lever left or right at the top of the device.
This blow off valve is very loud and may be compatible only for off-road racing vehicles and cannot be used on roads.
You may need to inquire to ensure that this model is compliant with your state laws
Comes with a gasket and easy to install
Editor's Rating: (5 / 5)
The Kompact by Turbosmart is mostly made for Mazda vehicles. This blow off valve is quite small and does not take a lot of space inside the hood of your vehicle.
This small and compact form factor is highly beneficial especially considering that most Mazda sports cars are usually small and do not have a lot of space under the hood.
In addition, despite being small, this blow off valve is quite loud. It is also very easy to install and can be done in a matter of minutes.
The bottom line is, if you own a compatible Mazda like the Mazda CX7 or MPS, then this top-rated blow off valve will make an excellent fit for your vehicle.
Large 50mm port for better air efficiency
Editor's Rating: (5 / 5)
The TiAL has been designed with a 50mm port that will allow a lot of air to flow to the motor. It also sports a heavy-duty diaphragm inside that allows it to make a loud whoosh sound when blowing off the sound.
In addition, this valve comes with all installation accessories like 1/4 inch hose attachments. Installation is very beginner-friendly and quite straight forward.
Furthermore, the mounting clamp at the bottom of this blow off valve gives this model its distinctive look.
It is worn and tear resistant, and since it is made from a corrosion-free metal, it will be long-lasting as well.
When compared to previous TiAL models, this unit allows roughly 60% more air which definitely makes it a significant improvement.
This valve is also quite heavy-duty as this blow off valve will comfortably work on a powerful vehicle with a big engine, of up to 1,800 hp. Pretty impressive!
Very affordable and value for money
Editor's Rating: (4.7 / 5)
One big problem with the blow off valve is that they tend to be quite expensive and outside the budget of most people.
This is not a problem with the XS Power because it is the best blow off valve when it comes to price in this review.
Having a small price does not necessarily mean bad quality. Indeed, this model is made from a high-grade aluminum metal that will not corrode and is quite resistant to wear and tear.
Also, installation is quite easy, and it comes with 2 mounting holes at the base for you to firmly bolt it to your vehicle. Adjustments to the sound can easily be made with the hex screw at the top.
And even if this model has been made to work with Mazda cars, you can tweak it a little bit and make it work on other vehicles as well.
Low-profile and universal blow off valve
Editor's Rating: (4.3 / 5)
If you do not have a lot of height under the hood to install your blow off valve, then the TurboXS is the right model for your need.
Indeed, this is a very low-profile blow off valve that despite its small height is still heavy-duty and produces a loud sound.
Furthermore, this unit lacks the adjustment that you can make in other blow off valves but it is very easy to install, and it comes with mounting holes at the base for a secure fit.
But where this blow off valve really shines is in its design.
It has a universal fit and can be installed on almost any vehicle with ease. You are not restricted to specific car models like a most other blow off valves in this review.
How to Buy the Best Blow Off Valve
#1. Types of Blow Off Valve
There are several types of blow off valves on the market. Here are 2 of the most common types that you will encounter.
Vented: The vented blow off valve is the most popular type of aftermarket blow off valve that you can purchase.
It produces the distinctive whoosh sound because this blow of valve evacuates excess air pressure that comes directly from the turbo system outside of the vehicle.
Recirculated: On the other hand, the recirculated blow off valve is usually a silent blow off valve that is factory fitted.
This type of blow off valve “recirculates” compressed air back to the intake (before the turbo) so as to provide more responsiveness to the turbo system when you shift gear.
By design, blow off valves are generally not universally compatible with all vehicles. Rather, manufacturers make them in order to fit a specific type of vehicle.
Therefore, each blow off valve model has an air inlet and outlet of varying sizes. For reference, 40 mm is the most popular diameter of your blow off valve.
Nevertheless, you will still need to ensure that your vehicle is compatible with a particular type of blow off valve.
If you are unsure, you may need to check the manufacturer's website or the product description to know about the compatibility.
#3. Noise Rating
The blow off valve is reputed for its whoosh sound.
The sound level in a blow off valve is measured in decibels. And most reputable and top-rated blow off valves on the market tend to be very loud.
Therefore, so as to comply with laws, you need to ensure that the blow off valve does not produce a sound that is above tolerable levels.
Furthermore, each blow off valve will produce a distinct sound, and this sound will depend on their internal design, shape, and size.
Being able to adjust the sound of your blow off valve as well as the amount of air that it delivers to your engine is vital.
Most blows off valve have a special mechanism that allows you to tune those settings with a screwdriver.
However, each model has its own specificities, and you may need to check your user manual to learn how to make adjustments to your blow off valve.
#5. Easy to Install
You don’t need any special tools or spend hours to install the blow off valve.
In fact, most models are very straightforward and easy to install by absolute beginners.
If you have never installed a blow off valve before, then make sure that the manufacturer ships their product with a detailed instructions manual.
It will show you exactly how to install the blow off valve on your vehicle.
As any other accessory installed in your vehicle, the blow off valve will suffer from wear and tear.
Therefore, you need to perform regular maintenance every few months to ensure that the blow off valve is working in tiptop conditions.
One factor that directly affects the performance of the blow off valve is leakages. Make sure to inspect your blow off valve for any leakages of oil and air.
If you have a turbo installed on your vehicle, then you absolutely must have a blow off valve.
It will allow your vehicle to evacuate any excess pressure buildup and make your engine run optimally and efficiently.
You simply install it between the intercooler and the throttle body and all you will need is a few minutes of your time.
Finally, our blow off valve review above contains some quality models that are well worth it. If you are not sure which blow off valve to purchase yet, then read the review one more time.