Blow Off Valves

On gasoline engines, blow off valves are plumbed between the turbocharger compressor outlet and the throttle body. They prevent potential damage to the turbocharger...

On gasoline engines, blow off valves are plumbed between the turbocharger compressor outlet and the throttle body. They prevent potential damage to the turbocharger due to a phenomenon known as compressor surge. When the engine transitions from boost to closed throttle, pressure can build up between the turbo and throttle plate. This surge can rapidly slow the compressor wheel, resulting in accelerated wear and possible damage to the turbocharger. It also causes turbo lag when the throttle is re-opened and the driver has to wait for the turbocharger to spool up before it can begin making boost again.

The main components...

The main components of a BOV, sometimes called a dump valve, are a housing, spring, and piston. The upper portion of the valve references intake manifold pressure via a hose. At idle, the blow off valve is held shut by spring pressure. Under boost, both spring pressure and manifold pressure continue to hold the valve closed. When the throttle is closed, manifold vacuum helps lift the piston against spring pressure, allowing boost to escape to atmosphere. In some applications, blow off valves recirculate boost pressure back to the inlet side of the compressor; these are often referred to as diverter or recirc valves. With many blow off valves, additional springs are included to adjust the opening to a desired amount of manifold vacuum. Depending on the vehicle or engine management used, blow off valves can also be electronically controlled, with no vacuum line to the intake manifold.

In applications with a centrifugal supercharger, a blow off valve performs the same function, allowing pressure to escape when the throttle is closed but the compressor is still creating boost. It can also function as a supercharger wastegate, limiting maximum boost.

While they are traditionally used on turbocharged gas engines, blow off valves are also used on high-performance diesel engines to vent excess boost pressure under deceleration, when the engine is slowing rapidly.

Blow off valves are often classified by size in millimeters, with 50mm being common size. Universal blow off valves often mount with a V-band clamp, and a weld-on fitting may be included for installation. They can also mount with a hose barb, 3-bolt flange, or OE-style mounting for factory replacement units. Shop a huge selection of blow off valves from Summit Racing, Turbosmart, TurboXS, Precision Turbo & Engine, Vortech, and more.

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Summit Racing™ 50MM Blow-Off Valves SUM-260070

Summit Racing™ 50MM Blow-Off Valves SUM-260070

Blow Off Valve, Turbo BOV, 50mm, Adjustable, Aluminum, Black Anodized, -10 to -14 in. Hg and -18 to -22 in. Hg springs included.

Part Number: SUM-260070

4.81 out of 5 stars ( 16 )

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Summit Racing™ 50MM Blow-Off Valves SUM-270150R

Blow-Off Valve, 50mm, Adjustable, Aluminum, Black Anodized, Each

Part Number: SUM-270150R

Not Yet Reviewed

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1132

Blow-Off Valve, Gen-V, Adjustable, Aluminum, Black Anodized, Each

Part Number: TBS-TS-0204-1132

4.5 out of 5 stars ( 2 )

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Turbosmart Vee Port Blow-Off Valves for 2015-2021 EXPEDITION, 2011-2023 F-150 - TS-0225-1001

Blow-Off Valve, Vee Port, Electro-Mechanical, Aluminum, Black Anodized, Ford, F-150, 2.7L/3.5L, Ecoboost, Each

Part Number: TBS-TS-0225-1001

4.83 out of 5 stars ( 6 )

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VS Racing X50 Blow-Off Valves VSR50BOV

Blow-Off Valve, X50, 50mm, Adjustable, Aluminum, Black Anodized, Each

Part Number: VSG-VSR50BOV

4.92 out of 5 stars ( 13 )

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1135

Blow Off Valve, GenV RacePort Sleeper, Black, Each

Part Number: TBS-TS-0204-1135

Not Yet Reviewed

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Turbosmart Kompact EM Dual Port Blow-Off Valves for 2021-2023 BRONCO, BRONCO SPORT, 2022-2023 MAVERICK - TS-0223-1082

Blow-Off Valve, Kompact EM Dual Port, Billet Aluminum, Black Anodized, Ford, Each

Part Number: TBS-TS-0223-1082

5.0 out of 5 stars ( 4 )

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1061

Blow-Off Valve, Dual Port, Adjustable, Aluminum, Black Anodized, Each

Part Number: TBS-TS-0203-1061

4.71 out of 5 stars ( 14 )

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Precision Turbo and Engine PTE Blow-Off Valves PBO083-2005

Blow-Off Valve, PTE, 50mm, Adjustable, Aluminum Flange Included, Billet Aluminum, Black Anodized, Each

Part Number: PTU-PBO083-2005

4.0 out of 5 stars ( 2 )

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Turbosmart Kompact Plumb Back Blow-Off Valves TS-0203-1223

Blow-Off Valve, Aluminum, Black Anodized, 34mm, Plumb Back, Universal, Kit

Part Number: TBS-TS-0203-1223

5.0 out of 5 stars ( 1 )

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Turbosmart Kompact Plumb Back Blow-Off Valves TS-0203-1222

Blow-Off Valve, Aluminum, Black Anodized, 25mm, Plumb Back, Universal, Kit

Part Number: TBS-TS-0203-1222

3.67 out of 5 stars ( 3 )

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1022

Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, 25mm Outlets, Each

Part Number: TBS-TS-0203-1022

4.67 out of 5 stars ( 3 )

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Precision Turbo and Engine PTE Blow-Off Valves PBO083-2010

Blow-Off Valve, PTE, 64mm, Adjustable, Aluminum Flange Included, Billet Aluminum, Black Anodized, Each

Part Number: PTU-PBO083-2010

Not Yet Reviewed

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Vortech Maxflow Racing Bypass Valves 8D204-111

Blow-Off Valves, Maxflow Racing Bypass Valves, Adjustable, Aluminum, Black Anodized, Each

Part Number: VOR-8D204-111

5.0 out of 5 stars ( 10 )

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1152

Blow-Off Valves, Gen-V Race Port, Adjustable, Aluminum Flange, Billet Aluminum, Black Anodized, For Supercharged Engines, Universal, Each

Part Number: TBS-TS-0204-1152

Not Yet Reviewed

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Granatelli Motor Sports 50mm Blow-Off Valves 540200

Blow Off Valve, Turbo BOV, 50mm, Adjustable, Aluminum, Black Anodized, Each

Part Number: GRN-540200

5.0 out of 5 stars ( 1 )

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1142

Blow-Off Valve, Gen-V, Adjustable, Aluminum, Female Flange, Black Anodized, Each

Part Number: TBS-TS-0204-1142

Not Yet Reviewed

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1162

Blow Off Valve, RacePort GenV. Black, RB26, Each

Part Number: TBS-TS-0204-1162

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Estimated Ship Date: Feb 16, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves for 2016-2018 FOCUS - TS-0203-1064

Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, Ford, 2.3L, Each

Part Number: TBS-TS-0203-1064

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Turbosmart Kompact Dual Port Blow-Off Valves for 2016-2019 ATS - TS-0203-1008

Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, Cadillac, Pair

Part Number: TBS-TS-0203-1008

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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Turbosmart Power Port Blow-Off Valves TS-0207-1002

Blow-Off Valves, Power Port Blow-Off Valves, Adjustable, Billet Aluminum, Black Anodized, Kit

Part Number: TBS-TS-0207-1002

Not Yet Reviewed

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Go Fast Bits Respons TMS Direct-fit Blow-Off Valves with TMS Advantage T9003

Blow-Off Valve, Fully Adjustable Sound BOV/Diverter, WRX 2001-07, STi 2002-on, XT Forester 2005-08, Each

Part Number: GFS-T9003

5.0 out of 5 stars ( 1 )

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0223-1087

Blow-Off Valve, Kompact Dual Port, Electro-Mechanical, Aluminum, Black Anodized, Plug and Play, Buick, Cadillac, Chevrolet, 2.0L, Each

Part Number: TBS-TS-0223-1087

5.0 out of 5 stars ( 1 )

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Turbosmart Kompact Dual Port Blow-Off Valves for 2013-2019 FIESTA - TS-0203-1065

Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, Ford, 1.0L, Each

Part Number: TBS-TS-0203-1065

1.0 out of 5 stars ( 1 )

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Turbosmart Power Port Blow-Off Valves TS-0207-1003

Blow Off Valve, Power Port Supercharger, Black Each

Part Number: TBS-TS-0207-1003

Not Yet Reviewed

Estimated Ship Date: Feb 16, 2026 if ordered today

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