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.

Individual Parts

Part Groups

Results 1 - 25 of 28

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 )

Estimated Ship Date: Tomorrow

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Turbosmart Blow-Off Valves TS-0204-3104

BLOW OFF VALVE

Part Number: TBS-TS0204-3104

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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

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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

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Turbosmart Big Bubba Sleeper Blow-Off Valves TS-0204-1303

Blow-Off Valve, Big Bubba, Adjustable, Aluminum, Black, Flange, Kit

Part Number: TBS-TS-0204-1303

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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

Estimated Ship Date: Tomorrow

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Turbosmart Big Bubba Sleeper Blow-Off Valves TS-0204-1203

Blow-Off Valve, Big Bubba, Adjustable, Aluminum, Black, Flange, Kit

Part Number: TBS-TS-0204-1203

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 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: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

Turbosmart Blow-Off Valves TS-0204-1405

BOV RacePort Plumb Back GenV Sleeper

Part Number: TBS-TS-0204-1405

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 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: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 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: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

Turbosmart Blow-Off Valves TS-0204-3014

BOV RacePort Titanium Weld Flange to Suit Female BOV

Part Number: TBS-TS-0204-3014

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Turbosmart Blow-Off Valves TS-0204-3015

BOV RacePort Titanium Weld Flange to Suit Male BOV

Part Number: TBS-TS-0204-3015

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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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Turbosmart Blow-Off Valves TS-0204-1145

BOV RacePort Female GenV, BOV RacePort Female GenV - Sleeper -22inHg No Weld Flange

Part Number: TBS-TS-0204-1145

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

Turbosmart Blow-Off Valves TS-0204-1185

BOV Race Port Female GenV, BOV Race Port Female GenV Sleeper 22InHg No Weld Flange

Part Number: TBS-TS-0204-1185

Not Yet Reviewed

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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

Estimated Ship Date: Aug 25, 2025 if ordered today

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Estimated Ship Date: Aug 25, 2025 if ordered today

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