Tuning

Best Blow Off Valve – Improve Performance and Sound with This Best Sounding BOV Review

Best Blow Off Valve

You’ve just finished some work on your car and you are awful proud of it. You got that new turbocharged installed and you take it for a drive and love the performance, but there is something missing. You have the performance, but you want that sound, you know the one. That sound that fills a gear head with pride when they hear their car putting on the power. To get that amazing sound you’ll want to track down and install the best blow off valve. Luckily, we are here to help in your quest.

And also, if you are newer to working on your car and don’t quite know what exactly it is that a blow off valve (sometimes named also as sounding BOV) does for you, we’ll dig into that as well. And you’ll learn that this device does more than just give your car that powerful sound so many people are after. And if you are ready to make a purchase but don’t know which to select, we’ve rounded up 5 of the top choices for you and offered our best blow off valve reviews to let you know why they are great choices.

Best Blow Off Valve – Our Top Picks Compared

But first, let’s take a look at our 5 TOP pick of best sounding BOV out there today.

editors-choiceBest Product Best Value  
editors-choiceBest ProductBest Value
GFB WRX Blow Off Valve KitGReddy Blow Off ValveHKS Super SQV4 Sequential Blow Off Valve KitTurbosmart Blow Off ValveTiAL Q Series Blow Off Valve
item-titleGFB 08-10+ WRX / 05-09 LGT TMS Respons Blow Off Valve KitGReddy (11501665) Blow-Off ValveHKS (71008-AK001) Super SQV4 Sequential Blow Off Valve KitTurbosmart TS-0203-1061 Blow-Off ValveTiAL Q.11R Q Series Blow Off Valve 50mm BOV Red 11 PSI Spring Aluminum Flange
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How To Choose the Best Blow-Off Valve

What Is a Blow Off Valve and What Does It Do?

A blow off valve is a rather simple device that allows you to vent pressurized air from a turbocharger. It differs from a compressor bypass valve (CBV). The CBV routes the pressurized air back into the non-pressurized intake. The blow off valve, as the name implies, vents the air back into the atmosphere. When you lift your foot off the pedal you can end up with a compressor surge. This surge can throw your turbocharger out of alignment.

blow-off valves operation

As this pressurized air is leaving the engine it makes a noise. Some options will shape the exit vent to resemble a trumpet and improve the sound made by the blow off valve. There are people who even install a blow off valve solely for the noise it produces so that their ride sounds more impressive – that exactly are sounding BOV’s.

Be sure that you double check your particular turbocharger system. Some will require the use of a blow off valve, while some need a CBV, also known as a diverter.

Why and How Blow-Off Valve Can Improve Performance and Sound of Your Car?

As mentioned in the paragraph above, when your engine has a turbocharger and you lift your foot off the pedal it can produce a surge from the compressor. This, in turn, can slow the compressor or even has the ability to stall it. If you were to put your foot back down on the throttle right after you may notice a fluttering sound and a lag in your turbochargers performance.

best sounding bovOf course, the other problem is that in addition to a lag you can end up stressing the turbocharger. A BOV valve will vent that extra compressed air into the environment which can stop the compressor surge before it happens. This will reduce the stress on your turbocharger and you won’t have to worry about turbo lag if you take your foot off the pedal and then need to accelerate right after.

The other part of the equation is the sound that it produces. They produce a whoosh or a hissing sound. While the sound may be limited if your setup just has a straight vent, if the vent is trumpeted out it can produce a more appealing sound.

Most Known Sounding BOV’s Manufacturers

One should always be careful when looking at a product based solely on the best brands. Sometimes this will cause you to look into products that have been made the same way with innovation and skip a smaller unknown that is turning out amazing products. On the other hand, though best brands get to fall under that title since they have been making top notch products for a good amount of time. But let the brand name only get your attention, not make the final choice for you.

best blowoff valve sounding bov manufacturers

In the world of BOVs, you should consider offerings from GFB, HKS, and GReddy. HKS has been making high-quality aftermarket parts since 1973, working hard to make cars perform better than their manufacturers thought they could. GReddy was founded in Japan in 1977. They were not only founded by racers but they are still driven to hold that racing heritage. GFB takes a different tact. It is an Australian company and the GFB stands for “Go Fast Bits”. They have quite a few years in their background engineering high-quality pieces.

Blow-Off Valve – What To Look For When Considering a Purchase?

As we’ve mentioned above there are CBV that plumb the air back into the engine and BOVs that vent the air out. The most important thing to consider when looking into one of these is that you know how your engine needs to deal with that extra air. If you don’t look into this you’ll end up with poor engine performance at best and possible damage at the worst. There are now some systems that are hybrid and can perform in either manner or a mixture of both.

Next, you’ll need to make sure that you match the valve to your engine. You will not only need to consider the port sizes that you will connect, but also the amount of air that can be put through them. This ensures that your selected model will be able to handle the amount of air that comes through your system.

Lastly, consider price and sound. Many people just want to go out and select the best sounding bov, but really you should consider performance first. Once you know that it will function well with your set up and that you won’t break the bank purchasing it, consider sound. You may have a few options to choose between and then again you might just have one or two.

BOV Installation Instructions

Installing your blow off valve is going to depend an awful lot on your particular set up. Your type of car, the turbocharger that is in it and the device that you choose to install onto it will all tweak the exact method of installation. It never hurts to have a copy of the repair manual for your car that covers your turbocharger. And when doing any sort of repair work on your car in the engine compartment it is a smart move to disconnect the battery.

The actual installation should go fairly smoothly. You’ll first locate your current circulation valve (this is one of the things that your repair manual will prove quite handy with). That will need to come out and your new acquisition will then be put in its place (some essentials, like drives and screwdrivers will be needed). Depending on your particular setup there may be a few more steps to consider, but overall this is not a complicated installation.

Greddy BOV install on 2005 Subaru WRX
https://www.youtube.com/watch?v=Dw1WZg-3De0

Blow Off Valve Reviews – Our 5 TOP Picks of the Best Sounding BOV’s

Now that you have a good bit of understanding on what a blow-off can do for you and what to consider when you are looking at the best blow off valves, let’s look at some blow off valve reviews. We have gone through quite a few contenders and have selected 5 models that we feel are standouts.

Remember that you will need to consider them in conjunction with the vehicle that you intend to install them into, but any of the ones we have listed here should be outstanding choices. We have also highlighted our Best Valve Choice for a great option that is still budget friendly and our Best Product. Quick hint, the best product is the top choice overall, so if you don’t feel like doing a lot of reading you can just skip to picking up one of those.


GFB WRX Blow Off Valve Kit


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GFB 08-10+ WRX / 05-09 LGT TMS Respons Blow Off Valve Kit

If you are looking for a blow off valve kit that is rock solid, look no further than the GFB 08-10+ WRX / 05-09 LGT TMS Respons Blow Off Valve kit.

This kit comes with the valve, a gasket for attaching it and the correctly sized Allen key to make any adjustments. As the name implies it was designed for among other things the WRX. If you are putting it in one you will have to make a hard choice, though. You have the option to recirculate or vent to the atmosphere. The engine in a WRX is made to recirculate but you won’t get an amazing of a sound. However, if you vent it entirely you will find that the engine will backfire. This system lets you adjust how much goes back around and how much vents and give you that sound.

Installation for this is a breeze and will most likely take up all of about 10 minutes. Now you may find yourself tweaking the balance going doing a lot of test drives, but no matter how you stack it up this is a fine piece of equipment to load into your car. For a bullet proof offering such as this, it is no wonder that we have opted to go with this model as our pick for the best product.

Here are some useful videos which guys from GFB share with us. Definitely worth to watch.

GFB Respons Blow-off valve

https://www.youtube.com/watch?v=ECkvx-YWgQI

GFB Spring Pre-load Adjustment

https://youtube.com/watch?v=KgGRfR6jt-c

HKS Super SQV4 Sequential Blow Off Valve Kit


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HKS (71008-AK001) Super SQV4 Sequential Blow Off Valve Kit

This kit is aimed to be as universal as possible while not breaking the bank. The HKS (71008-AK001) Super SQV4 Sequential Blow Off Valve Kit comes with just about everything you need to get it into your car and cruise about. In addition to the blow off valve itself, the kit includes a c clip, vacuum tube T’s (should have a pair of them), an O-ring, and a filter for a vacuum line. One thing to note is that you may require a separate flange to install it properly and possibly a plug for the recirculation hose.

This is a BOV that produces a really great sound. Not only will you be able to enjoy it from inside, but others will know that you have one as you drive by. There is some concern that it will still end up causing some compressor surge, but overall it didn’t seem to be too much of an issue. Several reviewers have mentioned that this was an easy install once you are ready to put it in. It is a high-quality piece that produces a great sound, so if you are determined to get an amazing sounding unit and saving some money, this Super SQV4 from HKS is the way to go.


GReddy Blow Off Valve


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GReddy (11501665) Blow-Off Valve

The GReddy (11501665) Blow-Off Valve has a special trick up its sleeve. This universal fit blow off valve has been updated with what they are calling a “Floating Valve”. This system keeps all the upgrades of their previous models while also providing the user with better performance and more air flow regardless of the conditions exist while driving. Another perk of this new set up is that the whole system can boast a higher level of durability, giving you more years of performance with this bad boy under the hood.

The throttle response for this unit is excellent and your ears will enjoy that it is. This BOV is able to produce an amazingly crisp sound and do it with no worry about dealing with the dreaded compressor surge. This means you can have great performance and great sound married into a single unit. You should note, though, this setup does not come with a flange to attach it to your turbocharger (go and get one for you here), this will mean an added expense, should you choose to go with this model.  The system can handle 30 psi of air racing through it and the kit comes with different size vacuum line tees to aid in the installation.


Turbosmart Blow Off Valve


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Turbosmart TS-0203-1061 Blow-Off Valve

If you are searching for an easily installed option, the Turbosmart TS-0203-1061 Blow-Off Valve is just the one that you are looking for. It goes in simply, with merely 3 screws and a gasket you can be using your brand new investment and turning heads and you cruise along. One thing that came up is that this fits into a rather tight space for most vehicles. This means that if you have larger hands you might want to invite a friend with smaller hands to come over to help you get this in place.

And after that simple installation is complete you’ll be treated to quite a lovely whoosh as it engages. This is sure to bring a smile to your face each time you hear it. It may not be as loud as some other options, but this one will get the job down and sound good doing it. One note, though, it seems that some found this BOV to be a touch prone to leaks. While all of them can be, even if properly installed, leaks can cause a drop in power when driving. Be sure to take care to install the device correctly and every now and then check for leaks.


TiAL Q Series Blow Off Valve


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TiAL Q.11R Q Series Blow Off Valve 50mm BOV Red 11 PSI Spring Aluminum Flange

If you are looking for a package that gives you everything you need to bolt a blow off valve to your car, then the TiAL Q.11R Q Series Blow Off Valve 50mm BOV Red 11 PSI Spring Aluminum Flange is the kit to get.

This set up comes with pretty much everything that you need, including the flange to merely bolt the new unit onto your car and be ready to go. The body, as well as all of the internal components, have been precisely CNC machined from extremely durable 6061 aluminum alloy to offer you a device that will last.

The company claims that this is the highest flowing BOV that is presently on the market. They further put forth that a single unit can even handle 1,800 horsepower by itself. With those kinds of numbers, you shouldn’t worry too much about the TiAL Q.11R Q Series being able to stand up to just about any abuse that you can toss its way. As an added bonus while this option comes in red you will quickly find that you can get the same set up in a number of other colors, such as purple or blue to give your engine compartment that just right look you were after.

Don’t let a good sound cause your car to make a terrible noise. While many people are drawn to these devices for their sound, consider how your car handles air. If it needs the air to be recirculated back through the system and you decide to take it and vent it out to produce a noise you will end up causing damage to your car. And remember, a car that doesn’t run won’t be able to make a great sound, even with the world’s best sounding blow off valve installed.

Best Blow Off Valves – The Bottom Line & Conclusion

You should be fully armed for your quest to find the best blow off valve now. Remember the first thing you need to do is consider your car and turbocharger. This will help lead you along the road to the best selection for you.

We have covered 5 great choices above, but if you are looking to stick to a budget you will be well served by the HKS Super SQV4, as it gives you great performance while not costing too much. If you just have your eye on the best the GFB Respons Blow Off Kit is the best option that we have come across of the products that are on the market.

Once you have made you selection and have the device in your garage you’ll find that for the most part these items are easy to install and can provide years of service to you. But here, on garagechief.com we would like to know, which option did you end up going with and why? Please let us know in the comment section below.


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