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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Vortech Maxflow Racing Bypass Valves 8D204-111

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 )

Estimated Ship Date: Today

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Vortech Maxflow Racing Bypass Valves 8D204-064

Blow-Off Valves, Maxflow Racing Bypass Valves, Adjustable, 0-8 psi, Aluminum, Black Anodized, Each

Part Number: VOR-8D204-064

4.5 out of 5 stars ( 4 )

Estimated Ship Date: Today

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Vortech Race Bypass/Blowoff Valves 8D204-069

Bypass Valve, Adjustable, Aluminum, Polished, Each

Part Number: VOR-8D204-069

5.0 out of 5 stars ( 2 )

Estimated Ship Date: Apr 10, 2026 if ordered today

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Estimated Ship Date: Apr 10, 2026 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: Apr 10, 2026 if ordered today

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Vortech Mondo Bypass Valves 8D103-001

Bypass Valve, Mondo, Aluminum, Satin, 12-25 psi, Universal, Each

Part Number: VOR-8D103-001

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 10, 2026 if ordered today

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Estimated Ship Date: Apr 10, 2026 if ordered today

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: Apr 10, 2026 if ordered today

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Estimated Ship Date: Apr 10, 2026 if ordered today

COBB Tuning Bypass Valves 724665

Blow-Off Valve, Subaru LF BPV WRX 2008-2014, FXT 2009-2013, OBXT/LGT 2005-2009, Mazdaspeed3 2007-2013, Mazdaspeed6 2006-2007

Part Number: CBT-724665

Not Yet Reviewed

Estimated Ship Date: Apr 6, 2026 if ordered today

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Estimated Ship Date: Apr 6, 2026 if ordered today

Dorman Blow-Off Valves 911-240

Turbo Bypass Valve

Part Number: RNB-911-240

Not Yet Reviewed

Estimated Ship Date: Apr 13, 2026 if ordered today

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Estimated Ship Date: Apr 13, 2026 if ordered today

Standard Motor Products Blow-Off Valves TBV1027

EM- Turbocharger Bypass Valve

Part Number: SMP-TBV1027

Not Yet Reviewed

Estimated Ship Date: Apr 9, 2026 if ordered today

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Estimated Ship Date: Apr 9, 2026 if ordered today

Vortech Blow-Off Valves 8D101-002

Air Bypass Assembly, with Aluminum Discharge Tube, Ford, Kit

Part Number: VOR-8D101-002

Not Yet Reviewed

Estimated Ship Date: Apr 10, 2026 if ordered today

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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 )

Estimated Ship Date: Today

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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 )

Estimated Ship Date: Today

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0223-1093

Blow-Off Valve, BOV Kompact EM Dual Port VR10, Aluminum, Mini, Cooper S, Each

Part Number: TBS-TS-0223-1093

Not Yet Reviewed

Estimated Ship Date: Today

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0223-1092

Blow-Off Valve, BOV Kompact EM Dual Port VR9, Aluminum, BMW, 335I, 3.0L, Each

Part Number: TBS-TS-0223-1092

Not Yet Reviewed

Estimated Ship Date: Today

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0223-1063

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

Part Number: TBS-TS-0223-1063

Not Yet Reviewed

Estimated Ship Date: Today

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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: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

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 )

Estimated Ship Date: Today

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Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1009

Blow-Off Valve, Kompact Dual Port, Aluminum, Black Anodized, Mazda, Subaru, Each

Part Number: TBS-TS-0203-1009

3.0 out of 5 stars ( 2 )

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

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: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves for 2013-2021 VELOSTER - TS-0203-1031

Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, for Hyundai, Each

Part Number: TBS-TS-0203-1031

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1015

Blow-Off Valve, Kompact Dual Port, Aluminum, Black Anodized, Subaru, 2.5L, Each

Part Number: TBS-TS-0203-1015

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1010

Blow-Off Valve, Kompact Dual Port, Aluminum, Black Anodized, Nissan, Subaru, Each

Part Number: TBS-TS-0203-1010

Not Yet Reviewed

Estimated Ship Date: Apr 29, 2026 if ordered today

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Turbosmart Kompact Dual Port Blow-Off Valves for 1998-2002 FORESTER, 1994-2002 LEGACY - TS-0203-1016

Blow-Off Valve, Dual Port, Adjustable, Billet Aluminum, Black Anodized, Subaru Foreign Models, Each

Part Number: TBS-TS-0203-1016

Not Yet Reviewed

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1072

Blow Off Valve, Kompact Dual Port, Black, Each

Part Number: TBS-TS-0203-1072

Not Yet Reviewed

Estimated Ship Date: Apr 29, 2026 if ordered today

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Estimated Ship Date: Apr 29, 2026 if ordered today

Turbosmart Kompact Dual Port Blow-Off Valves TS-0203-1021

Blow-Off Valve, Dual Port, Adjustable, Aluminum, Black Anodized, 20mm Outlets, Each

Part Number: TBS-TS-0203-1021

Not Yet Reviewed

Estimated Ship Date: Apr 29, 2026 if ordered today

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