Seems like I'm having some compressor surge on low boost ( Under 5 psi). Tried to search and found some say it is while some say it isn't. I still hear the bov let out some air but also hear the surge I checked the bov, cleaned it and oiled it and it seems to still be occuring. Is this normal? The cylinder seems to move freely. Not sure what to check since it seems like a pretty simple device.

Thanks,

 

If you are using the 52mm valve ( there big one ) you might need a lighter spring due to not enough vacuum from the manifold to acctuate the piston fast enough.
If its the smaller adjustable ones loosen the adjustable head just before the orange index oring is visable. There are also other spring otions for there smaller vales as well. Make sure your getting intake manifold vacuum to the bov.

 

First check and double-check your boost/vaccuum lines to diaphragm, and connections on both ends for leaks. Soapy water can help you find leaks that aren't easily visible otherwise. If all that's OK, then check for a torn diaphragm inside the BOV.

If you can't get that BOV working right, you might take a look at the Synchronic BOV from Synapse Engineering. They offer two basic size models, each with 3 or 4 popular flange connections. They have no diaphragm to tear, adjustable outlet port size inserts, anti-stall kits options with different rate springs available, and multiple boost/vaccuum ports available to adjust the pilot pressure signal that's sent to the piston(instead of diaphragm). The end result is a metric buttload of adjustments to get it opening when you want it to open.