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Old 09-16-2013, 12:54 AM   #74 (permalink)
phunk
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My PCV vents into the air filter tubes, which is why I would get wetness in the charge pipes if I had excessive crankcase ventilation. But I do not.

This is how it has to be with a turbocharged vehicle in order to maintain vacuum to the crankcase. If it were in the pressured piping, I would have no functional PCV system once I was in boost.

I do not have any concerns with the oil buildup. I have never been a professional subaru tuner to debate how important or not it may be on that car. But in my VQs, I do not share your concerns with oil build up at all!


Quote:
Originally Posted by synolimit View Post
Your charge pipes should be dry. Why would you hook up the PCV system so far back and not like it is stock?

The manifolds the real story. That **** builds up like tar on it, bottom of fuel injectors, valves, cakes the top of the piston etc. its more internal that's the issue once it lowers octane mixing with the air/fuel. Ever done back to back dyno's on cars with similar setups with one with and one without after a lot of miles? And other cars are a must like subis. I can eject a 1/2 quart of oil out the valve vents in a high G turn which is why its a must they run AOS and not catch cans. The oil gets piped back to the block with them so they don't run out of oil after a few laps.

PS if your FI you'll always get oil in the charge pipes, the turbo seals can't seal 100% just like piston rings. But FI I'd definiantly do it because you now have two sources of oil getting into the manifold.
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