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

4.79 out of 5 stars ( 14 )

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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 Blow-Off Valves TS-0506-1101

Gen4 WG45 HyperGate45 Supercharger - 10PSI Black with springs

Part Number: TBS-TS-0506-1101

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

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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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

Not Yet Reviewed

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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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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 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-0204-1131

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

Part Number: TBS-TS-0204-1131

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-0204-1162

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

Part Number: TBS-TS-0204-1162

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1134

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

Part Number: TBS-TS-0204-1134

Not Yet Reviewed

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0208-1112

BOV Pro Port Black, BOV Pro Port Black

Part Number: TBS-TS-0208-1112

Not Yet Reviewed

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Go Fast Bits SV52 Blow-Off Valves T9052

Blow-Off Valve, Atmo Racing ValveSV52 - High Flow/High Pressure Racing Dump Valve (Alloy Weld On), Each

Part Number: GFS-T9052

Not Yet Reviewed

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Granatelli Motor Sports 50mm Ultra-High-Flow Blow-Off Valves 540201

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

Part Number: GRN-S0001

Not Yet Reviewed

Estimated Ship Date: Dec 1, 2025 if ordered today

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Estimated Ship Date: Dec 1, 2025 if ordered today

Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1133

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

Part Number: TBS-TS-0204-1133

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

Vortech Maxflow BV57 Bypass Valves 8D205-003

Bypass Valve, BV57, Aluminum, Clear Anodized, 0-10 psi, Universal, Each

Part Number: VOR-8D205-003

Not Yet Reviewed

Estimated Ship Date: Nov 18, 2025 if ordered today

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Estimated Ship Date: Nov 18, 2025 if ordered today

Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1144

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

Part Number: TBS-TS-0204-1144

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1143

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

Part Number: TBS-TS-0204-1143

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

Agency Power Adjustable Blow-Off Valves for 2017-2019 MAVERICK X3 X RS TURBO R, MAVERICK X3 X DS TURBO R, 2017-2021 MAVERICK X3 TURBO - AP-BRP-X3-151

Blow-Off Valve, Adjustable, Aluminum, Anodized Black, Can-Am, Kit

Part Number: APN-AP-BRP-X3151

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1141

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

Part Number: TBS-TS-0204-1141

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

Agency Power Adjustable Blow-Off Valve and Hose Kits for 2017-2019 MAVERICK X3 X RS TURBO R, MAVERICK X3 X DS TURBO R, 2017-2021 MAVERICK X3 TURBO - AP-BRP-X3-150

Blow-Off Valve, Adjustable, Aluminum, Anodized Black, Silicone Hose Kit, Can-Am, Kit

Part Number: APN-AP-BRP-X3150

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1232

Blow-Off Valves, Gen-V Race Port, Includes HE Position Sensor Cap, Adjustable, Aluminum Flange, Billet Aluminum, Black Anodized, Universal, Each

Part Number: TBS-TS-0204-1232

Not Yet Reviewed

Estimated Ship Date: Tomorrow

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Vortech Maxflow BV57 Bypass Valves 8D205-008

Blow Off Valve, Aluminum, Polished, Super High Flow, Universal, Each

Part Number: VOR-8D205008

Not Yet Reviewed

Estimated Ship Date: Nov 19, 2025 if ordered today

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Estimated Ship Date: Nov 19, 2025 if ordered today

Turbosmart Gen-V Race Port Blow-Off Valves TS-0204-1242

Blow-Off Valve, Race Port Gen V, Aluminum, Black Anodized, Hall-Effect Sensor, No-Weld Flange, Fits Competitor Flange, Each

Part Number: TBS-TS-0204-1242

Not Yet Reviewed

Estimated Ship Date: Nov 24, 2025 if ordered today

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Estimated Ship Date: Nov 24, 2025 if ordered today

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