Anyone know where this vacuum fitting connect to? 2.0 LSJ SC...
It goes to the little boost controller electrical module thinga-ma-jiggy, to the driver's side of the valve cover. It was next to the evap stuff. You still need that to control the boost.
There's no vacuum in the intake pipe between the filter and the turbo inlet. I believe you're thinking of the PCV system.I would suggest you keep the port and connect it to the intake. The line is part of the vacuum system designed to keep vacuum in the valve cover. A filter will vent, but will not help with the vacuum.
Many have indeed deleted it - maybe without major negative effects. If you have a turbo, the vacuum problem in the valve cover gets more complex.
There is more in-depth discussion here:
My kit included the pipe without the port as well. DF replaced it free of charge.
You have a very nice looking home, Love all the property, You are the MANI ordered a drill and tap to add the port, but then decided to do what most do and exclude crank case breather line all together and install a breather filter on the valve cover.
It really cleans up the rear of the valve cover visually and I saw no adverse performance.
Will probably swap out the filter every season, but when I had the valve cover baffles out the two before the breather were pretty clean.
In normal operation - excluding a catch can or oil separator:There's no vacuum in the intake pipe between the filter and the turbo inlet. I believe you're thinking of the PCV system.
Well saidIn normal operation - excluding a catch can or oil separator:
Airflow through the intake piping does create minor vacuum at the air filter - Bernoulli's theorem - the vacuum is what pulls air through the filter element. The connection of the valve cover to the intake pipe is to allow some air into the crankcase when certain operating conditions require not exceeding a specific vacuum limit created by the rest of the vacuum system.
The intake is under vacuum when not in boost - that is what the PVC that is mounted inside the intake manifold controls and pulls crankcase vacuum when the throttle is lifted. In boost, the PVC prevents pressure from entering the crankcase port from the intake manifold. When there is boost, the valve cover port that feeds into the turbo inlet pulls the air from the crankcase to maintain a vacuum on the crankcase pressure. It is possible that both could pull excessive vacuum and that is what the filtered air feed is from the intake tube before the turbo.
That's what the connection from the intake tube to the valve cover is for, to keep the vacuum level in check, so it is an important part of the vacuum system for a stock setup.