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, Sat, 17 Jun 2006 19:26:23
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I have used a similar valve from TurboXS, but as a bypass valve. I have used it on a 95SET and a 03 9-5 Aero.
Your valve has the boost pressure acting on the end of the piston. When on boost, the force of the spring (plus any packing washers) and the force of the boost pressure on the spring side of the piston, keep the valve shut. The boost pressure should balance things out on each side of the piston to a large extent, and the spring force takes over from there. When vacuum, the residual boost on the piston face plus the -ve pressure on the spring side, should open the valve... but read further how a BOV and BPV need to act differently although the contruction is very similar.
I would remove all of the washers and check that the vacuum hose does indeed flow and create negative pressure. The valve should/might open at idle. The manifold pressure will be lower on a fully warmed engine with fully warmed oil in the sump. So try with that.
Now one does not want a BOV staying open at idle after dumping pressure as this can allow air at idle and engine overrun to intake unfilter air. So one want to have the valve close at idle, and perhaps that is what the washers are for. So the valve should discharge and after the boost is dumped then be closed again.
So perhaps the BOV's have harder springs than the BPV's. The above is not a perfect description, but you should be able to figure it out. Try with no packing sprngs and see what that does. Adding more will sounds like it will simply make it worse off.
Also, as the valve dump the air, as the flow develops, the force of the flow hitting the piston face and turning 90 degrees also creates a force that helps push the piston back. So that is a dynamic and brief force that is distinct from the static forces of the VAC line, static pressure on the piston face and the spring force. So once flow starts, the flow itself helps open the valve and once the boost pressure has been dumped and flow volumes drop off, that dynamic force stops.
If your VAC lines and orifice are right and you can't get it to work, call TurboXS and ask if there is any way that you might have a spring that is too hard.
You packing washers go into the piston or at the end of the "cylinder head"?
, Sat, 17 Jun 2006 19:26:23
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