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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.
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Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford 150, EcoBoost, Each
Part Number: GFS-T9464
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Atmosphere Venting ATMO DV+ Direct Factory Replacement, Fitment Includes Mk5 and M6 GTI and Similar, Each
Part Number: GFS-T9451
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford, Each
Part Number: GFS-T9460
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Mercedes, Infiniti, Each
Part Number: GFS-T9458
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford, Each
Part Number: GFS-T9454
Not Yet Reviewed
Estimated Ship Date: Dec 29, 2025 if ordered today
Estimated Ship Date: Dec 29, 2025 if ordered today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford, Each
Part Number: GFS-T9468
Not Yet Reviewed
Estimated Ship Date: Dec 29, 2025 if ordered today
Estimated Ship Date: Dec 29, 2025 if ordered today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Ford, Each
Part Number: GFS-T9465
Not Yet Reviewed
Estimated Ship Date: Dec 29, 2025 if ordered today
Estimated Ship Date: Dec 29, 2025 if ordered today
Blow-Off Valve, Atmosphere Venting, Direct Factory Replacement, Volkswagen, Each
Part Number: GFS-T9430
Not Yet Reviewed
Estimated Ship Date: Dec 29, 2025 if ordered today
Estimated Ship Date: Dec 29, 2025 if ordered today
Blow-Off Valve, Kompact EM Dual Port, Billet Aluminum, Black Anodized, Ford, Each
Part Number: TBS-TS-0223-1082
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Aluminum, Black Anodized, 34mm, Plumb Back, Universal, Kit
Part Number: TBS-TS-0203-1223
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Dual Port, Adjustable, Aluminum, Black Anodized, Each
Part Number: TBS-TS-0203-1061
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Aluminum, Black Anodized, 25mm, Plumb Back, Universal, Kit
Part Number: TBS-TS-0203-1222
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, 25mm Outlets, Each
Part Number: TBS-TS-0203-1022
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Dual Port, Billet Aluminum, Black Anodized, Ford, Each
Part Number: TBS-TS-0223-1096
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Kompact EM VR2 Dual Port, Adjustable, Billet Aluminum, Black Anodized, Each
Part Number: TBS-TS-0223-1066
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Fully Adjustable Sound BOV/Diverter, WRX 2001-07, STi 2002-on, XT Forester 2005-08, Each
Part Number: GFS-T9003
Estimated Ship Date: Today
Estimated Ship Date: Today
Blow-Off Valve, Dual Port, Adjustable, Aluminum, Black Anodized, Each
Part Number: TBS-TS-0223-1063
Not Yet Reviewed
Estimated Ship Date: Today
Estimated Ship Date: Today
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
Estimated Ship Date: Today
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
Estimated Ship Date: Jan 2, 2026 if ordered today
Estimated Ship Date: Jan 2, 2026 if ordered today
Blow-Off Valve, Kompact Dual Port, Aluminum, Black Anodized, Jeep, Fiat, Each
Part Number: TBS-TS-0223-1086
Estimated Ship Date: Today
Estimated Ship Date: Today
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: Jan 2, 2026 if ordered today
Estimated Ship Date: Jan 2, 2026 if ordered today
Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, Ford, 1.0L, Each
Part Number: TBS-TS-0203-1065
Estimated Ship Date: Today
Estimated Ship Date: Today
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: Dec 31, 2025 if ordered today
Estimated Ship Date: Dec 31, 2025 if ordered today
Blow Off Valve, Kompact, Dual Port, Aluminum, Black Anodized, Cadillac, Pair
Part Number: TBS-TS-0203-1008
Not Yet Reviewed
Estimated Ship Date: Jan 5, 2026 if ordered today
Estimated Ship Date: Jan 5, 2026 if ordered today
Blow-Off Valve, Aluminum, Black Anodized, 20mm, Plumb Back, Universal, Each
Part Number: TBS-TS-0203-1221
Not Yet Reviewed
Estimated Ship Date: Jan 2, 2026 if ordered today
Estimated Ship Date: Jan 2, 2026 if ordered today
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