| HKS SSQV Super Sequential Blowoff Valve Subaru WRX or STi 05-06
Application: Subaru WRX or STi 05-06
Part Numbers: 71001-AF008 (old) / 71004-AF008 (new)
HKS Super Sequential Blowoff
Valves (SSQV) are dual stage pull type relief valves that by design do not leak
under high boost conditions or under idle vacuum and is actuated by pressure
alterations to ensure a quick primary and secondary valve response.
The HKS SSQV is available in
vehicle specific kits or as a universal unit for custom applications. Vehicle
specific HKS SSQV kits come complete with all mounting flanges, brackets, and
miscellaneous hardware for an easy installation. For Universal SSQV
applications, weld-on flanges are available in steel or aluminum for custom
installation.
How does it work?
The HKS Super Sequential Blow-Off
Valve (SSQV) is a dual stage
pull-type relief valve. Unlike typical push type blow-off valves, the SSQV will
not leak under any level of boost because the boost pressure in chamber "C"
keeps the
valve closed against its seat (Diagram 1). The SSQV releases excess boost
when there is a pressure alteration in chambers "A & B", not by the rate of
boost pressure or vacuum in the line. This ensures a quick valve response and
complete closure during idle. Many
competitors use a push-type blow-off valve design with a large valve to
accommodate high boost / high horsepower applications. These large valves re act
slowly and require high pressure to open, and are not
able to activate and prevent compressor surge at light-load conditions. On the
other hand, smaller, fast reacting push-type valves do not discharge the airflow
capacity required for high horsepower applications and tend to slowly open
and leak
as boost pressure overpowers the spring. For maximum performance, the HKS SSQV
incorporates both a small primary valve for ultra quick activation, and a larger
secondary valve for additional discharge capacity. The SSQV is engineered to
initially open the small primary valve at light throttle and load conditions
(Diagram 2), then sequentially opens the secondary valve for additional
relief capacity under high boost and load conditions (Diagram 3). The
SSQV is constructed of polished billet aluminum, which ensures long-term
durability and a high luster look. The mounting base utilizes a circular
mounting flange that combines with a C-clip snap ring and O-ring gasket to insure
an excellent seal. The triple-fin discharge port design produces a powerful,
unique and aggressive blow-off sound
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