What's your engine size...turbo size...and A/R housing size?
where is your boost reference line, and how long did you break in your engine before you went to 17psi?

 

its a 5.3 bored to 3.905, t4.t66 turbo boost referenced from intake, 1.05 A/R , the motor had about 300 miles on it before we ever put it on the dyno and about 2000 miles before i turned up the boost from 10 psi.

 

A little bit of air coming out of the crankcase is normal. That's blowby. All engines have it. As far as I know there is no way for the crankcase to pressurize through the turbo oil seals. I've never heard of it, even when seals go bad.

 

if they leak i think it is usually the other way around - oil comes out from the center section.

 

Turbos don't have oil seals, they have a metal ring on the turbine side looks like a sealing ring in an auto trans. As your turbo builds boost it pushes up on that ring and causes it to seal tightly. The only way to unseat the ring and push oil into the turbo housings is the have the oil drain line blocked causing the oil to push back up against that ring. Also if you have excessive crankcase pressure from blow-by it will prevent oil from draining properly and leak into your housings, but not the other way around. At least as far as I understand it, it's not mechanically possible to blow boost past a properly working ring seal.

 

Do you have a high mount or low mount remote??
never said.

 

Vent the valve covers the right way and you will have no issues.

R

 

it is a high mount, what do you mean by vent the valve covers the right way.

 

If you dont let the pressure get out of the pan, then the oil will back up on the drain, or if your vaccum is setup wrong as well. So what we do is put two fittings, one on each valve cover, then -10 or -12 line from each cover to a puke tank. It will handle large amounts of boost. I run almost 20 psi without moving a drop of oil, and my drains are clear all the time. Also, make sure your drain line is big enough. Nothing less than -10. And one more thing, make sure you are not over full on the oil in the pan.

R

 

Solid advise!
Do you have a pic of the system you run? Just curious because this subject has been hashed over so many damm times it's just silly at this point.

Thanks.