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Blow Off Valves (BOV)

Blow-off and diverter valves have always been popular upgrades for a turbo engine. However, not all car enthusiasts know why they are so important, and what the difference between a blow-off and diverter (also called bypass or recirculating) valve is. So let’s make things clear. Your turbocharger compresses air and forces it to the engine. This allows more air to enter the cylinders, which results in stronger combustion and increased horsepower. The high-pressure compressed air enters the engine when the throttle plate is open. However, when the throttle plate closes, this air has to be released; otherwise, the pressure in turbo piping will increase dramatically causing the air to move in the opposite direction. This can compromise vehicle performance and damage your turbocharger, engine and other vital vehicle parts.

Blow-off and diverter valves prevent this from happening by letting the air escape from the tubing. Once the throttle closes, the manifold pressure instantly drops below the atmospheric pressure. The valves sense this change and open to release the air. Blow-off and diverter valves do the same job but differ in the way they do it. Diverter valves recirculate the air back into the intake while blow-off valves vent it to the atmosphere. Since diverter (bypass) valves are better at keeping the pressure consistent, they come standard on most modern turbocharged vehicles. Blow-off valves create an attention-grabbing chuffing sound and are typically an aftermarket modification. On our website, you’ll find an extensive variety of both blow-off and bypass valves that are made using high-strength materials to offer uncompromising performance and reliability.

When choosing between a blow-off or a diverter valve, don’t forget to consider several important factors. First of all, remember that it’s not recommended to install a blow-off valve if you have a factory ECU and (MAF) sensor. The sensor calculates the amount of air that enters the engine and sends these data to the ECU so the ECU can determine the amount of fuel needed for a balanced air-fuel mixture. The blow-off valve vents the air after it has been calculated by the MAF sensor. But the control unit injects excess fuel taking into account the readings from the MAF sensor. This will eventually result in a rich mixture. To get a louder sound without compromising performance, choose a dual port blow-off valve that releases half of the air to the atmosphere while recirculating the other half back to the air intake. However, if you use an aftermarket ECU, you can upgrade to whatever valve you want for your vehicle .


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PERRIN PSP-TAC-600BK
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PERRIN PSP-TAC-600BK Recirculating Blow Off Valve

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$243.40

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PERRIN PSP-TAC-600RD
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PERRIN PSP-TAC-600RD Recirculating Blow Off Valve

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$243.40

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PERRIN PSP-TAC-610BK
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PERRIN PSP-TAC-610BK Recirculating Blow Off Valve

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$243.40

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PERRIN PSP-TAC-610RD
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PERRIN PSP-TAC-610RD Recirculating Blow Off Valve

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$243.40

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PERRIN PSP-TAC-615RD
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PERRIN PSP-TAC-615RD Recirculating Blow Off Valve

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$243.40

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GREDDY 11900440
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GREDDY 11900440 Type-FV Blow Off Valve Attachment

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$27.08

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GREDDY 11900442
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GREDDY 11900442 Type-FV Blow Off Valve Attachment

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GREDDY 11900451
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GREDDY 11900451 BOV Flange For Type R / RZ / RS / S BOV

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$50.98

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HKS 1422-SA001
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HKS 1422-SA001 Super SQV Special Fin, SF100-P

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$26.83

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HKS 1422-SA002
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HKS 1422-SA002 Super SQV Special Fin, SF120-G

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$26.83

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$23.33

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HKS 71002-AF002
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HKS 71002-AF002 Suction Return Kit

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$39.57

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$34.41

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HKS 71002-AK004
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HKS 71002-AK004 Super SQV Return Nipple

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HKS 71002-AK011
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HKS 71002-AK011 Super SQV Flange, Stainless Steel

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$34.11

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HKS 71002-AK012
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HKS 71002-AK012 Super SQV Flange, Stainless Steel

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$34.11

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HKS 71002-AK013
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HKS 71002-AK013 Super SQV Flange, Aluminum

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HKS 71002-AK016
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HKS 71002-AK016 Super SQV O-Ring & C-Ring Set

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$23.20

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$20.17

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HKS 71008-AF006
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HKS 71008-AF006 Super SQV4 Kit

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$363.58

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HKS 71008-AF012
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HKS 71008-AF012 Super SQV4 Kit

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$363.58

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HKS 71008-AF013
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HKS 71008-AF013 Super SQV4 Kit

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$363.58

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HKS 71008-AK001
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HKS 71008-AK001 Super SQV4 Universal

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$272.56

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$237.01

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HKS 71008-AK004
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HKS 71008-AK004 Racing SQV Installation Flange Is Included

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$304.42

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HKS 71008-AM011
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HKS 71008-AM011 Super SQV4 Kit, Not for use w/ Piping Kit

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$390.89

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HKS 71008-AM015
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HKS 71008-AM015 Super SQV4 Kit

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$477.34

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$415.08

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HKS 71008-AM016
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HKS 71008-AM016 Super SQV4 Kit

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$477.34

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HKS 71008-AN027
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HKS 71008-AN027 Super SQV4 Kit

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$1,096.23

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