Let me start by saying this is exactly how I have my catch can setup. I am getting an oil smell at idle that I don't think is blowby. I'm considering keeping the setup the same and venting the passenger side valve cover, or redoing everything with a dual inlet "Mighty Mouse" type catch can. My current catch can is an Elite Engineering unvented can, with a check valve before the manifold. I am running a SD tune.

 

You probably have oil in your intake track from when you are under boost.

 

With that setup you shouldnt have any smell. I concur with atomic.

 

Well with that setup he is venting the crankcase into the turbo inlet, so he is ingesting oil at the worst possible time.

A better setup would be to not have it going to the intake tube and just route hose to a vented catch can. Bottom line is recirculated setups are not good for high power boosted engines. It may cut down on the oil smell during cruise, but you risk having oil all in the intake, which detonates very easily. These engines move a lot of air in the form of blow by during boost, so you would still be pressurizing the crankcase if the air can only escape through a small hose to a vented can.

 

The amount of oil on my setup was very trace. Nothing in the charge pipes and just a small brown spot on the compressor wheel. When i put the 80mm i just vented the passenger vc

 

Yea I was thinking the crankcase vent into the turbo inlet is where my issue is. The intake manifold is dry, spark plugs are clean and dry.

Will the crankcase vent sufficiently if the turbo inlet isn't drawing from the passenger side?

So essentially I have 2 options.
1. Run a 2nd vented catch can for the passenger side, and possibly have faint scent of oil vapor at cruise.

2. use a "Mighty Mouse" type dual catch can that still vents the crankcase to the turbo inlet, but catches most of the passenger side oil before it does so.

 

Pull off the pipe between the compressor housing and the intercooler and have a look. I bet it, or the entrance to the intercooler are oily.

There is normal pressure buildup in the engine on its own without a vacuum source, vapors will naturally find there way out of there. A vented can is good at trapping most of the vapors. I have run a vented can the whole time on mine and never noticed a smell at cruise. If im crawling over the engine while its idleing then sure, but its not like you smell like an oil field guy if you have a vented can

Even with the might mouse type can, at some point you will outflow that can and have pressure buildup in the crankcase.

 

Atomic are you also running a check valve on the passenger side or did you run both sides to the same can?

 

Both sides to the same can, no check valve. Also had the valley going to the same can as well.

My setup had a breather on the passenger coil cap, 3/8" hose to a 3/8" tee in the valley to a 1/2" hose to the vented can. Driver side had 2x 3/8" hose to the can. All that and still wasnt enough.

 

Are the check valves only needed for MAF tunes?