That's a reference line and yes goes to manifold


You stated plumbed into as many circulating valves are

 

at idle when the manifold is in vacuum your BOV will always be open... am I missing something here? Is it staying open too long? Are you just concerned that its open at idle?

It takes removing the vacuum in the manifold (opening the throttle) for it to close.

I dont know how they are typically routed for turbo guys, so I can't help much. It does seem it would be kind of counter productive to have it not build boost until the throttle is pressed a lot. Can the BOV be adjusted to close at lesser vacuum? It would have to be fairly spot on to what your idle vacuum is. Maybe that's what you were asking in the first place lol.

 

It's my buddies truck . It was open at idol but when we throttled up it just stayed open we believe it has a soft spring and wouldn't build boost so I brought him my tial q with a 8lbs spring and it was closed so were gunna work with that and see if it'll build boost tuning it tonight.

We did the lap math which was 65 at idle and converted it into inhg like tials spring sheet lists them and he's at a 19 inhg at idle so they say it should use the 11lb spring

 

swap it to the push/pull style.

 

The manifold will still be in vacuum when you rev it and it comes down. It will close when the pressure on both sides of the throttle body is close to the same. At idle, pressure in the manifold is much lower than the intact tube. Changing the spring will not effect spool much since boost depends on wheel speed most important. In fact it will probably spool faster with the BOV open, but you will obviously need to close it when you want boost after the wheel speed is up.