Lowest boost for BOV
 

What is the lowest boost that a BOV will open up on? I can rev my car to 6k and let off on the gas and I hear compressor surge. In neutral reving to 6k I get 3.5 to 4psi of boost.

The spring is as loose as it gets. Do I have to be driving for my BOV to open?

Re:Lowest boost for BOV
 

do you have the vacuum lines ran into it?

Re:Lowest boost for BOV
 

Vaccum is ran to a T from the intake manifold.

Re:Lowest boost for BOV
 

try running a bigger line to it...what kind of bov is it?

Re:Lowest boost for BOV
 

It is a Blitz SS BOV. I am running 1/4 fuel line for vaccum to the BOV. Shouldn't that be enough?

Re:Lowest boost for BOV
 

I always thought that a BOV wouldnt open unless the engine was under load, just reving it with the car stationary wont open it?

Re:Lowest boost for BOV
 

I think that depends on the BOV and what car its on.

Re:Lowest boost for BOV
 

BOVs work of vacume wich is always present in the manifold when the throtle plate is closed.If your car is not turboed yet and you want to see if a BOV works you can just pull a vacume line off your manni. and that vacume will open the valve.This is how you can test your "junk yard" BOVs to see if they work.If your BOV is not openning then somethings wrong.

Re:Lowest boost for BOV
 

What do you mean just hook vaccum to it? I am turboed right now. If what you say is right then the valve would stay open because at idle.

I think that the BOV has to see a load for it to open because if not, it would just bleed off boost at wide-open-throttle. The Blitz also came with a hard spring for high boost. What is the average setting on low boost springs on BOVs?

Re:Lowest boost for BOV
 

How would it leak at wide open throttle if there is no vacume pressent to open the diaphram.There is only pressure present at wide open throttle.Vacume is created couse the engine is trying to suck air frome where ever it can at idle or when the throttle plate is closed.Only when the throttle plate is closed will it have vacume.If it is open(wide open throttle) then you have pressure not vacume.So if the bov works on vaccume at WOT it would be closed........right?