[Slim415]

After removing my charge pipe and seeing some oil inside of it, I was concerned but I now understand that it's normal for our N54 motors to have oil blow by in the CP. But normal or not, I can't imagine it's good for the long term performance of our motors. So my question is, does getting a oil catch can alleviate this issue and is it actually necessary? I run a stage 2 tune with supporting mods and drive my car maybe 2K miles a year.

[Emilime75]

Not necessarily necessary, but doesn't hurt, either. Mostly keeps the valves cleaner longer. One could argue that it also keeps MAP sensors clean and maintains efficiency of the intercooler if they aren't coated in oil.

If you're worried about it and want maximum benefit, go with the RB external PCV kit, Mishimoto OCC that he recommends and tap/plug the head ports. This handles the low side which is where most driving occurs. You can also add a 2nd, basic can to the high side, but those catch very, very little.

[BSM n54iS]

Originally Posted by Emilime75

Not necessarily necessary, but doesn't hurt, either. Mostly keeps the valves cleaner longer. One could argue that it also keeps MAP sensors clean and maintains efficiency of the intercooler if they aren't coated in oil.

If you're worried about it and want maximum benefit, go with the RB external PCV kit, Mishimoto OCC that he recommends and tap/plug the head ports. This handles the low side which is where most driving occurs. You can also add a 2nd, basic can to the high side, but those catch very, very little.

I'm running the ECSTuning/Turner occ right now. It plugs the low side pcv valve instead of having an upgraded valve there, forcing all blow by exhaust gases to the high side and is then caught in the occ along with high side as well. I think unless you're going 600hp+ roughly you wouldn't need to plug each individual port, but if you start pushing close to stage 2 turbo levels then you'd want to go that route instead with dual occ's.

Both have a really clean passenger side option also, or an even better driver side location that isn't on the strut tower brace. Turner also offers perfect length A/N fittings, was told they run this setup on their race cars also so good enough for me. Oh and they come with a dipstick! lol if you've been missing having a dipstick to check oil levels

Edit: I'm now going with an RB external in combo with to see results

[iqraceworks]

Like others have said ....not necessary, but having one might keep your valves cleaner longer. Honestly, some oil particles in the intake stream isn't going to do a thing as far as reducing power and performance.

I ordered a catch can a few days ago.....just because they are so cheap.

[Emilime75]

Originally Posted by BdSM n54iS

I'm running the ECSTuning/Turner occ right now. It plugs the low side pcv valve instead of having an upgraded valve there, forcing all blow by exhaust gases to the high side and is then caught in the occ along with high side as well. I think unless you're going 600hp+ roughly you wouldn't need to plug each individual port, but if you start pushing close to stage 2 turbo levels then you'd want to go that route instead with dual occ's.

Both have a really clean passenger side option also, or an even better driver side location that isn't on the strut tower brace. Turner also offers perfect length A/N fittings, was told they run this setup on their race cars also so good enough for me. Oh and they come with a dipstick! lol if you've been missing having a dipstick to check oil levels

Plugging the low side PCV is news to me, so I can't say much about it, but if it works...it works. But, I don't see how horsepower level has anything to do with the decision to plug the head ports. It's 6 holes between valve cover area and intake valves. Any blow by and oil splashing from the cams can make it down those passages and ends up on the valves.

[BSM n54iS]

Originally Posted by Emilime75

Plugging the low side PCV is news to me, so I can't say much about it, but if it works...it works. But, I don't see how horsepower level has anything to do with the decision to plug the head ports. It's 6 holes between valve cover area and intake valves. Any blow by and oil splashing from the cams can make it down those passages and ends up on the valves.

I think it has to do with the amount of crankcase pressure, I may be wrong