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Blow Off Valves |
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A blow-off valve (also called a compressor bypass valve or diverter valve)
is a valve that is placed between the turbo compressor and the throttle,
generally a piston type valve, that bypasses the pressurized air on a
closed throttle under boost to prevent both the compressor surge
(fluttering noise) and any potential damage to the turbo. The air is
either plumbed back into the turbo inlet for silent operation, or to the
atmosphere to make the signature blow-off valve whoosh. Some factory
valves have systems designed into them to crack open at high boost. If you
are intentionally raising the boost level, this is bad news as the valve
will begin to leak pressure. Examples of factory valves which exhibit this
behavior are the Subaru WRX MY95-98, and MY01-04, Mitsubishi Lancer GSR,
and Nissan 200SX to name a few. Replacing these valves when increasing the
boost is a good idea.
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Sequential Blow Off
Valves |
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The sequential blow off valve is a pull open type relief
valve unlike all other blow off valves which are push type. The sequential
blow off valve is actuated by pressure alterations only, ensuring quick
valve response and complete closure during idle. With standard blow off
valves for high boost applications, big valves are needed, which
unfortunately react slowly and require high activation pressure to open.
Smaller, fast reacting valves, do not permit the air flow required. With
the sequential blow off valve, a small primary valve is utilized for ultra
quick activation along with a secondary valve for additional relief
capacity. |
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SCSS carries a variety of different styles and
manufacturers of both styles of blow off valves
Contact us for pricing and availability for your
vehicle and power needs. |
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