BFI catch can installed and in neutral smokes just like BSH.

[CorneliusRox]

Can someone tell me more about the rear PCV? Is in the port on the back of the valve cover, facing the cabin? in my car there is a ribbed plastic hose, OEM I think, that wraps around and connects somewhere underneath my intake manifold. I can't even see what it actually connects to, so I have no idea what its function is.

So what I'm wondering is, in an OEM setup, what does the other end of the hose connect to, and what similar sized port is located on the right side of the engine block underneath the intake manifold??

I always got confused on this too, but the rear PCV is actually on the passenger side of the car and the rear side of the engine. Right above the compressor side of the turbo and goes into the VC

[groundround]

I always got confused on this too, but the rear PCV is actually on the passenger side of the car and the rear side of the engine. Right above the compressor side of the turbo and goes into the VC

any pics of it from the top of the engine bay looking down?

[CorneliusRox]

no. but right next to your air filter. like up from the DV

[Charles.waite]

All of the factory PCV Valves and subsequent revisions to them fail even at stock boost levels. When they fail, you wind up with charge air from the intake manifold further pressurizing the crankcase. This greatly degrades performance and can lead to oil seeping out from valve cover gaskets, blowing by the oil cap, etc.

FWIW, the 034Motorsport B7 Audi A4 2.0T FSI Catch Can Kit completely eliminates the factory PCV setup without any smoke issues.

No I get that part. I guess whats confusing to me is that the factory PCV valve provides the function of ensuring the crankcase doesn't see excess pressure, allowing the valve cover gasket to leak and whatnot. The BSH bypass solution just completely ignores that function and it seems like BFI catch can doesn't re-implement that necessary feature. I mean its pretty obvious, to me, that that is likely the issue here. I guess I just get why people ignore the necessity to avoid excess pressure in the, which despite its faults, the OEM valve regulates just fine. Again, I'm not saying the OEM solution is ideal, since its very prone to failure, I just don't think the BSH solution is better without some re-engineering to accomodate crankcase pressure regulation.

I'm not familiar with your solution Lazlo so I can't comment on it directly. Do you guys address the crankcase pressure regulation issue?

[groundround]

No I get that part. I guess whats confusing to me is that the factory PCV valve provides the function of ensuring the crankcase doesn't see excess pressure, allowing the valve cover gasket to leak and whatnot. The BSH bypass solution just completely ignores that function and it seems like BFI catch can doesn't re-implement that necessary feature. I mean its pretty obvious, to me, that that is likely the issue here. I guess I just get why people ignore the necessity to avoid excess pressure in the, which despite its faults, the OEM valve regulates just fine. Again, I'm not saying the OEM solution is ideal, since its very prone to failure, I just don't think the BSH solution is better without some re-engineering to accomodate crankcase pressure regulation.

I'm not familiar with your solution Lazlo so I can't comment on it directly. Do you guys address the crankcase pressure regulation issue?

No there setup is just about the same as every other setup. I think I know what you are talking about though.

So on the pcv plate there are 3 spots from the rear to the front. The middle section there is a tube that goes to the IM, what if I do the euro jet tube with check valve, and the front piece have that going to the catch can and cap off the 2nd spot (now the euro jet with check valve will be run like stock to the IM)

something like that? I might have made it confusing. The third spot (closest to firewall on pcv plate) remaining the same as with stock pcv or with the BFI plate there is not change and that tube runs under the IM somewhere.

[034Motorsport]

No I get that part. I guess whats confusing to me is that the factory PCV valve provides the function of ensuring the crankcase doesn't see excess pressure, allowing the valve cover gasket to leak and whatnot. The BSH bypass solution just completely ignores that function and it seems like BFI catch can doesn't re-implement that necessary feature. I mean its pretty obvious, to me, that that is likely the issue here. I guess I just get why people ignore the necessity to avoid excess pressure in the, which despite its faults, the OEM valve regulates just fine. Again, I'm not saying the OEM solution is ideal, since its very prone to failure, I just don't think the BSH solution is better without some re-engineering to accomodate crankcase pressure regulation.

I'm not familiar with your solution Lazlo so I can't comment on it directly. Do you guys address the crankcase pressure regulation issue?

The factory valve cover and PCV design has two ways to ventilate the crankcase:

• The breather tube going to the compressor inlet. This is always at or below atmospheric pressure, and allows for crankcase ventilation. Some years have a check valve in this tube.
• The breather tube going to the intake manifold.This only allows crankcase ventilation when the intake manifold is at or below crankcase pressure, which requires the use of a check valve. The OEM one is failure prone, as discussed earlier.

If you block off either one, all of the crankcase ventilation is facilitated through the other breather tube.

The problem with simply blocking off the PCV breather assemble going from the valve cover to the intake manifold without a catch can is that you end up with no way to separate oil and water vapor from the crankcase gasses, and end up with a ton of oil, water, and fuel going through your turbo and pooling up in your intercooler(s).

Our catch can kit eliminates the intake manifold breather provision, and uses a "vortex" style catch can to separate the oil and water vapor from the crankcase gasses, before routing the expelled gasses back to the valve cover, and then to the turbo inlet. The port that we use on the valve cover features an internal passage to the breather tube at the compressor inlet.