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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...
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 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.
Blow-Off Valve, X50, 50mm, Adjustable, Aluminum, Black Anodized, Each
Part Number: VSG-VSR50BOV
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Blow-Off Valve, 50mm, Adjustable, Aluminum, Black Anodized, Each
Part Number: SUM-270150R
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Blow-Off Valve, PTE, 50mm, Adjustable, Aluminum Flange Included, Billet Aluminum, Black Anodized, Each
Part Number: PTU-PBO083-2005
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Blow-Off Valves, Maxflow Racing Bypass Valves, Adjustable, Aluminum, Black Anodized, Each
Part Number: VOR-8D204-111
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Blow-Off Valves, Maxflow Racing Bypass Valves, Adjustable, 0-8 psi, Aluminum, Black Anodized, Each
Part Number: VOR-8D204-064
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Blow-Off Valve, PTE, 64mm, Adjustable, Aluminum Flange Included, Billet Aluminum, Black Anodized, Each
Part Number: PTU-PBO083-2010
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Blow-Off Valve, PTE, 30mm, Adjustable, Aluminum Flange Included, Billet Aluminum, Black Anodized, Each
Part Number: PTU-PBO083-2000
Not Yet Reviewed
Estimated Ship Date: Aug 11, 2025 if ordered today
Estimated Ship Date: Aug 11, 2025 if ordered today
Bypass Valve, 0-10 psi., Plastic, Black, Up to 375 hp, Each
Part Number: VOR-8D001-004
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BLOW OFF VALVE
Part Number: PCH-3FASS-006
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Blow-Off Valve, Dual Outlet Valve, Hyundai/Kia, 1.6L, Each
Part Number: GFS-T9211
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Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
Bypass Valve, Adjustable, Aluminum, Polished, Each
Part Number: VOR-8D204-069
Estimated Ship Date: Aug 18, 2025 if ordered today
Estimated Ship Date: Aug 18, 2025 if ordered today
Blow-Off Valve, Fully Adjustable Sound BOV/Diverter, Billet Alumiunum, Black Anodized, Toyota, Nissan, Mitsubishi, Each
Part Number: GFS-T9035
Not Yet Reviewed
Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
Bypass Valve, BV57, Aluminum, Clear Anodized, 0-10 psi, Universal, Each
Part Number: VOR-8D205-003
Not Yet Reviewed
Estimated Ship Date: Aug 18, 2025 if ordered today
Estimated Ship Date: Aug 18, 2025 if ordered today
Blow-Off Valve, By-Pass Acutator, 4th Gen, Steel. Black. 3.4L, Each
Part Number: MPS-45-00-04-112
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Estimated Ship Date: Aug 11, 2025 if ordered today
Estimated Ship Date: Aug 11, 2025 if ordered today
Blow-Off Valve, Hybrid Dual Outlet, Billet Alumiunum, Black Anodized, Mitsubishi, Subaru, Each
Part Number: GFS-T9233
Not Yet Reviewed
Estimated Ship Date: Tomorrow
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Blow-Off Valve, Hybrid Dual Outlet, Billet Alumiunum, Black Anodized, Volkswagen, Audi, Saab, Each
Part Number: GFS-T9225
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Blow-Off Valve, Fully Adjustable Sound BOV/Diverter, 2015-on, WRX/Forrester, Each
Part Number: GFS-T9007
Not Yet Reviewed
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Blow-Off Valve, Hybrid Dual Outlet Valve, Billet Aluminum, Black Anodized, Subaru, Each
Part Number: GFS-T9207
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Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
Blow-Off Valve, Atmo Racing ValveSV52 - High Flow/High Pressure Racing Dump Valve (Alloy Weld On), Each
Part Number: GFS-T9052
Not Yet Reviewed
Estimated Ship Date: Tomorrow
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Blow Off Valve, Turbo BOV, 50mm, Adjustable, Aluminum, Black Anodized, Each
Part Number: GRN-540200
Estimated Ship Date: Tomorrow if ordered today
Estimated Ship Date: Tomorrow if ordered today
BLOW OFF VALVE
Part Number: PCH-3FASS-019
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Estimated Ship Date: Tomorrow if ordered today
Estimated Ship Date: Tomorrow if ordered today
Blow-Off Valve, Hybrid Dual Outlet Valve, WRX 2008-on, GT Legacy 2003-09, XT Forester 2009-12, Each
Part Number: GFS-T9201
Not Yet Reviewed
Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford, Each
Part Number: GFS-T9454
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Estimated Ship Date: Aug 15, 2025 if ordered today
Estimated Ship Date: Aug 15, 2025 if ordered today
Blow-Off Valve, Fully Adjustable sound BOV/Diverter WRX 2008-on, GT Legacy 2003-09, XT Forester 2009-12, Each
Part Number: GFS-T9001
Not Yet Reviewed
Estimated Ship Date: Aug 19, 2025 if ordered today
Estimated Ship Date: Aug 19, 2025 if ordered today
VTA BOV 50mm Black
Part Number: GAP-914956-0003
Not Yet Reviewed
Estimated Ship Date: Aug 14, 2025 if ordered today
Estimated Ship Date: Aug 14, 2025 if ordered today
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Summit Racing™ 50MM Blow-Off Valves SUM-270150R
