When you are purchasing parts and putting together a turbo system, the blow off valve is a fairly important part of the system. Not only does it release all the excess pressure built up in the intercooler piping after the intake manifold closes, but a turbo BOV also creates a unique BOV sound, which can make your car sound like it’s quality tuned and unique. The HKS Super SQV (SSQV) turbo blow off valve is a BOV every turbo tuner should consider purchasing, as this specific BOV has many benefits to its unique construction.
In 1994, HKS released the first blow off valve, the SSQV BOV, containing the “pull” valve design, which was unlike the usual “push” valved blow off valves turbo tuners have always used. The “push” blow off valves have been the traditional type of turbo BOV used and they allow pressure to build up until the valve spring cannot hold anymore pressure, or the valve reaches its threshold, and then pushes the excess pressure out of the valve.
HKS created a design with the “pull” valve system, found on the HKS SSQV BOV, which uses and alters the pressure to pull open a dual valve system. The primary valve is the smaller valve, which opens up during smaller pressure conditions. When heavier pressure conditions are encountered, the SSQV BOV will open the larger, secondary valve, which allows all the excess pressure out during heavier and faster driving conditions.
Having the pull valve system allows the HKS SSQV BOV to prevent leaking, even when the car is idling or under extreme conditions. This system also allows a cleaner, more solid BOV sound, as it releases all the pressure with a fresh tuned sound, once the valve is pulled open.