BedHog

Just fitted an HKS SSQV that I bought secondhand.

There is an adjustment screw on the back of it - anyone kow what this does?

I assume it changes the pressure that it operates. At the moment it seems very low - what should it be and can playing with this cause any major problems?

Thanks for any help,

Rob.

Aztec Performance Ltd

iTrader: (234)

If it works and your car idles well and the smaller valve opens on early boost lift off I would just leave it alone. Yes the screws adusts how early the valve opens. From memory the looser the screw the earlier it opens. You have to find the correct balance if you do start messing with it. An explanation as to how they work and what they do...

" HKS compressor blowoff and bypass valves play a vital role in any turbo system because they not only improve the performance of your vehicle but they also increase the longevity of the turbocharger as well. The primary function of any blow-off or by-pass valve is to prevent compressor surge by relieving the compressed airflow that reverses direction as the throttle is closed. HKS blowoff and bypass valves reroute the pressurized air, that is normally forced backwards into the turbo compressor, into the intake stream or by venting it to the atmosphere. Subsequently, engine performance is then increased from quicker turbo spool up, as the compressor speed is not reduced by the backward airflow. The longevity of the turbo is also increased, as its bearings will not suffer from the impact that is also produced by compressor surge. Though many vehicles incorporate factory by-pass valves, they are often undersized and quickly are beyond their capable operating range as airflow levels are increased. "

and more

"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. 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 react 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 then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions"

clicky with diagrams : http://www.hksusa.com/products/more.asp?id=792

some discussions here : http://forums.evolutionm.net/showthr...2&page=1&pp=15

Bob