line connected to passenger side of TB...?
Oct 3, 2006 | 11:38 AM
#1
Thread Starter
Joined: Mar 2006
Posts: 2,867
Likes: 2
From: Dallas, Georgia
line connected to passenger side of TB...?
I was under the impression that this was a vacuum line that alot of you eliminated due to it allowing oil into the intake similar to the pcv. Upon removing it for the first time last night, I found that it pushes from the TB to the VC instead...and that was at idle...I assume that under boost, it would increase as well. Obviously, there was no oil in the line...removal did not seem to have an effect on idle either...
What is the purpose of this line? And why would anyone want air sent to the VC?
What is the purpose of this line? And why would anyone want air sent to the VC?
Oct 3, 2006 | 12:07 PM
#2
Thread Starter
Joined: Mar 2006
Posts: 2,867
Likes: 2
From: Dallas, Georgia
just got a great answer from kp @ ls1tech...
Originally Posted by kp
Thats the fresh air line for the PCV, since its in front of the throttle blade it pulls no vacuum.
It has two purposes in stock form, it pulls clean air from the air filter into the crankcase and also that air is metered through the MAF since its a closed system that same air goes back into the intake though the PCV valve.
On a forced induction car that line will cause the crankcase to be pressurized since the boost is going straight into the crankcase. You need to cap the port off on the TB and either run a breather on the valve cover or a hose down to the blower/turbo inlet from the valve cover. The reason you feel air coming out is because the bypass isnt big enough to bleed all the pressure off from the blower at idle. Cap it off and use a breather, probably pick up a little boost and your rings will thank you
It has two purposes in stock form, it pulls clean air from the air filter into the crankcase and also that air is metered through the MAF since its a closed system that same air goes back into the intake though the PCV valve.
On a forced induction car that line will cause the crankcase to be pressurized since the boost is going straight into the crankcase. You need to cap the port off on the TB and either run a breather on the valve cover or a hose down to the blower/turbo inlet from the valve cover. The reason you feel air coming out is because the bypass isnt big enough to bleed all the pressure off from the blower at idle. Cap it off and use a breather, probably pick up a little boost and your rings will thank you
Originally Posted by Superado
Awesome info...thank you!
I have recently replaced the filler neck with a filtered breather and removed my pcv valve...replacing it with an "old school" Moroso vc breather with a fitting that I plan on running a hose->check valve->nipple->catless y-pipe...I will cap this line from TB off today as well...thanks again!
I have recently replaced the filler neck with a filtered breather and removed my pcv valve...replacing it with an "old school" Moroso vc breather with a fitting that I plan on running a hose->check valve->nipple->catless y-pipe...I will cap this line from TB off today as well...thanks again!
Thread
Thread Starter
Forum
Replies
Last Post
zblee
GM Engine & Exhaust Performance
15
Aug 3, 2015 03:45 AM
