Originally Posted by CO11WRX
I wonder when Subaru will finally make a production change to rectify this issue. It seems there are three common problems people have when increasing boost (they can even occur on stock cars as you noted)
1. Bypass Valve leaking
2. Plastic end tanks separating on the stock TMIC
3. This problem (throttle body/IC hose popping off)
Fortunately the TB/IC thing seems to be an easy fix. I will most likely follow your advice and remove those POS end caps. I will probably invest in some t-bolt clamps as well.
That's a good plan.
Those are all common.
Also the hose that goes from the top of the BPV to the back of the intake manifold can pop off the intake manifold. Needs a zip tie to hold it on. if this pops off it causes a pretty bad boost leak. I don't see this one as much on stock cars. Usually higher boost (20+ psi).
Originally Posted by scx89
What exactly is the oil from? I've read that it's blow by and it's a result from the ringlands seals not being perfect and oil slipping past them. Shouldn't it be no oil at all? I need to find a good read on this
It's blow by. Some cars have more than others.