Sorry I actually put what I think might be the reason in the write up! I can't be sure till I look at it today, but until I find out what is causing my blowby I wanted to let people know not to go ahead with this till we figure this one out
Here is what I wrote: Don't do this mod the way I did it until I do further testing!!!!!! I am having oil blowby through my turbo and I think its caused by this mod. This has been driving me nuts the last 24 hours. I for the life of me know I put the turbo together right. Its not rocket science, so I did some searching and found this:
The turbocharger “seals” play a secondary role in turbocharger oil control since the oil slingers are designed to prevent oil from reaching the seal areas. The primary role of the turbocharger seals is to prevent external gases (i.e., boost pressure and/or exhaust gas) from entering the center housing. Under most operating conditions in a blow-thru configuration, the gas pressures in the compressor and turbine housings are equal to or greater than the gas pressure in the turbocharger center housing (i.e., engine breather pressure). In this configuration, the pressure on the turbocharger seals is from the outside toward the inside and is actually trying to push any oil near the seal areas into the turbo.
If the engine breather system has been modified so that the engine crankcase cannot breathe and is causing excess crankcase pressure, this pressure is transmitted to the turbocharger center housing via the oil drain tube. In this situation, the crankcase pressure in the turbo center housing may exceed the compressor and/or turbine housing pressure; therefore, the pressure on the turbocharger seals is from the inside toward the outside and the crankcase pressure will push oil out of the center housing into the compressor and turbine housings. Excess crankcase pressure may be caused by engine breather modifications such as improperly installed performance breathers/catch cans or by worn or damaged engine components (i.e., pistons, rings, or cylinder walls) that result in severe combustion gas blow-by that pressurizes the engine crankcase and turbocharger center housing.
The only thing I can figure is by reducing the outlet side of the doghouse from 1/2 inch id to 3/8 and running it through the jegs filter is restricting it too much and causing to much back pressure. I am going to remove the hose in the am and see if my blowby changes. I am sorry for posting this and not testing it enough first. I hope I caught this soon enough before someone buys the filter and uses my writeup. I will do more testing tomorrow and get back with my findings!