Quote:
Originally Posted by Hawiann22
to me it seems like your throwing the vacuum back into the bov causing it not to operate
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Huh? BOVs need vacuum to operate.
They work on pressure differential. One side of the diagram/valve is on the charge pipe. The other side is the vacuum port which runs to the manifold side of the TB. When the TB is open the pressure on the port has pressure on it equal to the charge pressure. This with the light spring keeps the valve closed. When you let off the throttle the TB closes and vacuum is created in the intake manifold. Now there is Vacuum on the port side of the BOV. In push style BOVs this creates a pressure differential that allows the boost in the charge pipes to push open the valve an vent. In Pull styles it uses the vac to pull the valve open to allow boost pressure to vent.