Impreza HKS Dump Valve SQV Blow Off Valve 1998-2000 GC8 GF8 EJ207 71007-AF005
Genuine HKS SQV blow off valve
HKS super SQV blow off valve fits to Subaru Impreza my9/1998 - 7/2000
HKS Super SQV (Sequential Blow Off Valve) uses a unique sequential valve structure and a differential pressure control system, which allows for a broad operating range from low boost to high boost. Its Pull-Type relief design ensures stable operation regardless of the amount of boost pressure. The Super SQV will support new generations of turbocharged vehicles.
High Quality Aluminium Based Die-cast Body
Black-coated aluminum die-cast body. Combines the ultimate in looks and durability in the engine compartment.
Triple Fin Design Produces "Super Sound"
Triple Fins set at the center of the funnel produces a dynamic and aggressive sound. An optional special Round Fin can be purchased separately for sound tuning.
The triple fin can be replaced with the recirculation fitting, which can be used to reroute discharged air back to the intake tract (hose not included). All Vehicle specific application kits will include a 19mm, 29mm (depending on vehicle) Recirculation fitting. Recirculation fittings are not included in Universal kits, but available for purchase separately.
The Super SQV is environmentally friendly, and RoHS compliant.
Pull-Type valve operation
The Pull-Type valve operation offers more precise relief of excess boost and is compatible for a wider range of boost pressure compared to typical push-type blow off valves.
Primary Valve (small)
Lift off the throttle, and the primary valve instantly opens, quickly discharging initial excess boost pressure.
Secondary Valve (large)
This valve combined with the Primary Valve form the sequential dual valve structure. Optimal blow-off operation from low to high boost ranges without leaking.
Duel Valve Structure - Sequential System
At low boost ranges the Primary Valve opens, and at high boost ranges the Secondary Valve also opens, resulting in linear response and optimal blow-off operation at all boost levels.
Accelerator ON (valves closed)
Accelerator OFF (primary valve open)
Accelerator OFF (secondary valve open)
As pressure rises in chamber C, pressure is applied to both the Primary and Secondary valves. The higher the boost pressure, the more pressure is applied to the valves, preventing leaks.
Throttle lift creates a pressure difference between chambers A&B, opening the primary valve bypassing the secondary valve. This creates the initial discharge.
When pressure difference in chambers A&B reach a maximum, the Primary Valve pulls the Secondary Valve open, creating a secondary discharge.
Pull-Type blow off valves work for any turbocharged vehicle, from stock to highly tuned.
Typical push-type blow off valves require spring load settings for each vehicle specification. If the spring load setting is too low, the valve may leak under high boost and the desired boost setting may not be reach. If the spring load setting is too strong, it may not open at low boost. The Super SQV will operate under any boost pressure setting without leaking.
HKS SQV blow off valve fits Subaru Impreza classic shape 2.0litre turbo UK and JDM import models
GC8 my9/1998 - /72000 saloon
GM8 saloon Prodrive P1 my1999
GF8 station sports wagon estate WRX
HKS Dealer Distributor / Subaru Impreza Parts for Turbo WRX STi UK & Import models Subaru dealer spare parts at low prices
Subaru Impreza Performance and Tuning Specialists Graham Goode Racing Lutterworth Road Aylestone Leicester LE2 8PH England Tel 0116 244 0080 / 0116 245 2320