Originally Posted by honda-guy

the spring itself might only hold 13 psi, but remember the vac line is connected to the intake manifold, so the total force the bov can hold would be 13psi from the spring and what ever amount of boost is in the manifold.

remember, there's equal amount of pressure on both side of the bov diaphragm, but since the vac line is pretty small, that side of the diaphragm usually see a little less boost. the spring is there to make up the difference in boost and to keep the bov close until the vac in the manifold is strong enough to overcome the force of the spring which is usually around 20+ psi at deceleration.

Originally Posted by matt55

Yes when i tested the bov's i had pressure to vac port ALSO .

So that still mean that the stocker open up @13psi WITH the vac port pressurised the same psi as the bov it self .

If ya'll doubt it please try it your self vs sitting at a key board and tell me what you think works.....

Originally Posted by honda-guy

i never said i didn't believe you, that's why i asked warr if he tested the stock dv with the vac line pressurized. if you said that the stock opens up at 13 psi with vac line pressurized, there's no reason for me to not believe you and waste 20 minutes of my time to go and try it myself.

so if the stock dv opens at 13 psi, that means that the turbo has to be making 27 psi for the intake manifold to see 20 psi. guess i'll be looking for an after market bov that doesn't have "leaking" feature soon.

btw, anyone has a jdm MR DV or a ix DV for sale?