Turbosmart manufactures high-performance aftermarket recirculating blow-off valves as well as the more noticeable vent-to-atmosphere versions. Our Dual Port valves feature a split between recirculating and atmospheric operation. Therefore, Turbosmart Dual Ports provide quiet, computer-friendly operation on low boost.

Turbosmart BOVs are designed to provide excellent sealing of the intake system. This results in reduced stress on the turbocharger when compared to the standard bypass valves. Furthermore, they will not leak air pressure regardless of how much boost the turbocharger is making.

A dual port BOV uses a valve section that is activated by low pressures, like those encountered during idle or slow speed driving. At higher speeds and pressures, a secondary valve opens to relieve the large quantities of back pressure produced when the throttle is released.

Adjustment to the BOV is made by rotating the cap. This increases the spring force on the piston, Rotate the cap clockwise in the direction of hard as marked on the top of the cap. To decrease the spring force on the piston.

Does a blow off valve add horsepower? Of course the BOV does not increase horsepower, rather the efficiency of the turbo, I do understand this, just for the record.

You don’t need to tune for the BOV.

A: The harder and softer adjustment is for setting the spring tension. If the spring is too stiff, then the valve will flutter when releasing air and if the spring is too soft, then the valve will stay open while the car is idling.

You can make it a little louder by relocating it closer to the throttle body, adding a K&N filter or “cold air” intake, and especially by chipping since you’re running higher boost.

Because this car monitors manifold pressure with MAP sensors rather than metering the air with a MAF sensor, changing intakes or switching to a VTA BOV won’t change much.. the ECU will simply recalibrate based on having different pressure, but without a tune it’ll recalibrate to aim for the same torque goals, so a …

A blow-off valve is a version of a compressor bypass valve that vents to atmosphere. There is no performance reason for doing this, but it does make a really loud noise. On the Evo, the short intake tract means if you add an aftermarket intake, you get some pretty loud bypass valve noise just from the factory valve.

Sydney, Australia
In June 2015, Turbosmart outgrew its 6,500ft2 manufacturing plant. The business moved to a brand new 27,000ft2 facility in Western Sydney, Australia, to help handle the growing market demand.