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Message: <blockquote data-quote="97stanger" data-source="post: 1426593" data-attributes="member: 8229">Apology accepted.  Now let's figure this out.What size WG are you running (mm?)  Yes, springs are typically color coded for what psi they are.  I agree, you have an issue either in the WG or BOV, or both.  Could be plumbing, could be functionality.  Have you tried to completely bypass the WG spring and run this solely on Boost controller to see if you have the same issue? Do you know how much vacuum your motor is pulling? What cams?If we can rule out its not a WG issue, I would than start looking at the BOV...again, spring pressure will make or break if it is actually completely closing while the throttle blade is open, and properly opening while the blade is close as it should be</blockquote>