Toyota GT86 AVO Polished Blow Off Valve

A blow off valves job is to vent all that built up pressure back into the system or out to atmosphere. This allows the turbo to continue spinning freely. This is important not just for pressurizing the air going into the engine, it is also important for the exhaust gases going out of your engine, as they run through the turbo exhaust side to spin it up.

OEM BOVs are usually a lightweight plastic assembly designed to be effective only at stock boost levels. Problems can arise when you increase boost levels, possibly overloading the BOV with a higher pressure level than it was designed to handle. Our BOVs are built to take bigger boost levels, responding quickly to throttle lifts. Moreover, weve designed them so that you have a choice on how it vents.

We created a lightweight brass piston design ideal for total boost control with TMIC and FMIC applications. This lightweight piston setup ensures accurate boost control and venting.

Each of our BOVs comes with a removable plate that will allow a percentage of boost to vent to atmosphere. It still recirculates the majority of the air back into the system, which is important for keeping a smooth idle. Modern ECUs on todays cars compensate for the amount of air that has been dumped back into the system, and when you simply remove that air, it leads to idle problems as it throws the system off temporarily.