Ok guys... IDK if you have fixed your problem or not but here should be the solution...
I had the same issue just the other week and i was stumped on how to fix it....
The "VACUUM" line that comes from your valve cover that goes into your into your intake line right before your throttle body on a NA car is "CORRECT" for a NA setup
Now when you have a turbo setup that same valve cover vacuum needs to still only see "VACUUM". There fore you need to take that hose from the valve cover down to the INTAKE part of the turbo some where between the air filter and the turbo intake. Now you have created a continuous vacuum in the valve cover.
The PVC valve will be always be seeing pressure because it is connected to the intake plenum side. So there is a continuous flow in the valve cover.
But when you have that valve cover hose connected somewhere on the intercooler piping we will have an issue.
Once your turbo starts to spool we see positive pressure in that intercooler piping. That charged system of air will start to flow into your valve cover hose as well there fore creating a POSITIVE air pressure in the valve cover.
With all this pressure in the valve cover/CRANK CASE the pressure needs a way out when your putting 10lbs of boost on the entire system. We are all lucky that we don't blow your lower oil pan seals and blast oil all over the freeway and blowing our selves up. So the pressure comes out of your dipstick which is the weakest park if you have good seals all around your motor.
There is a hose that connects from the back of the throttle body, which also a 1" or so line, that is connected to the bottom of a STOCK bluebird, or whatever stock motor you got it from, BOV PIPING that allows your motor to idle. So that is the hose that needs to be hooked up where you have your current valve cover intake source.
I hope this helps you fix your problem, it worked for my car.
I had the same issue just the other week and i was stumped on how to fix it....
The "VACUUM" line that comes from your valve cover that goes into your into your intake line right before your throttle body on a NA car is "CORRECT" for a NA setup
Now when you have a turbo setup that same valve cover vacuum needs to still only see "VACUUM". There fore you need to take that hose from the valve cover down to the INTAKE part of the turbo some where between the air filter and the turbo intake. Now you have created a continuous vacuum in the valve cover.
The PVC valve will be always be seeing pressure because it is connected to the intake plenum side. So there is a continuous flow in the valve cover.
But when you have that valve cover hose connected somewhere on the intercooler piping we will have an issue.
Once your turbo starts to spool we see positive pressure in that intercooler piping. That charged system of air will start to flow into your valve cover hose as well there fore creating a POSITIVE air pressure in the valve cover.
With all this pressure in the valve cover/CRANK CASE the pressure needs a way out when your putting 10lbs of boost on the entire system. We are all lucky that we don't blow your lower oil pan seals and blast oil all over the freeway and blowing our selves up. So the pressure comes out of your dipstick which is the weakest park if you have good seals all around your motor.
There is a hose that connects from the back of the throttle body, which also a 1" or so line, that is connected to the bottom of a STOCK bluebird, or whatever stock motor you got it from, BOV PIPING that allows your motor to idle. So that is the hose that needs to be hooked up where you have your current valve cover intake source.
I hope this helps you fix your problem, it worked for my car.
Last edited by allmotor
on 2011-03-04
at 18-22-12.
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Originally Posted by allmotor 
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