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

[groundround]

So why does this happen to some people with a catch can and not others?

With the BSH and the new BFI when in neutral the car smokes like crazy. Put the stock pcv back on and no smoke ever.

What happens is I open it to atmosphere (take the dip stick out on top of the BFI catch can)? some say once theyt do that the smoking stops but I wonder if you loose any boost or performance by doing this seeing it's not a closed loop?

[jimrobbington]

I don't get why it would do this. I have no smoke unless WOT, then I might have a little smoke from running a little rich. Are you burning through oil?

JR

[groundround]

I don't get why it would do this. I have no smoke unless WOT, then I might have a little smoke from running a little rich. Are you burning through oil?

JR

well just installed the BFI last night but when I had the BSH on I was not burning through oil. This has happened to a couple people on here and only when in neutral, when in gear driving I don't smoke at all.

[jimrobbington]

That leads me to believe there is something going on with the vacuum side of things?

JR

[groundround]

That leads me to believe there is something going on with the vacuum side of things?

JR

what is your belief?

[jimrobbington]

Honestly, I couldn't tell you. It just seems to only happen when in vacuum. Hopefully someone else can chime in.

JR

[groundround]

very true. I am going to try with the dip stick taken out of the cc at lunch and see what happens

[Operator]

Hmm I wonder if an TIP will run into a similar ordeal. Not having to use N much I would think it won't be a big deal.

[flashovermac]

very true. I am going to try with the dip stick taken out of the cc at lunch and see what happens

how full is your cc? does it happen when its completely emptied?

[jimrobbington]

Maybe when in vacuum, there is actually too much negative pressure, and it is sucking stuff back into the engine? Have you done your n80? I don't know if it would help, but I think some people describe it helping their idle.

JR

[groundround]

I just installed the BFI setup last night so the cc is totally empty LOL

I just wrote the part number down for the N80 and plan on throwing a new one in for shits and giggles but doubt that has anything to do with it. I am doing it because I have 117K on the car and figure it can't hurt.

[groundround]

A little off topic but just wondering if anyone has every centered there transmission mount, motor mount, snub mount before? I posted a thread asking about it last week and got no replies, but I am sure there are people here that have doen this. There is a lot of threads about it in the B6 section but none with the B7.

I get a horrible rattling noise since the stern transmission mount and the mech that installed it never centered it (center bolt loose, both motor mounts loose and snub mount bracket loose) turn car on idle, A/C full blast then tighten. Same person installed motor mounts and snub mounts so I am sure they need to be centered as well. I hear good things about doing this if not done as far as vibrations be gone from centering the mounts.

[CorneliusRox]

i know your answer ;-)

[jimrobbington]

I just installed the BFI setup last night so the cc is totally empty LOL

I just wrote the part number down for the N80 and plan on throwing a new one in for shits and giggles but doubt that has anything to do with it. I am doing it because I have 117K on the car and figure it can't hurt.

If you have replacement hose clamps, you can pop it off real quick and try blowing through it. If you can, it's shot.

JR

[CorneliusRox]

So catch cans are directional (like I was saying on the BFI catch can page). Swap your tubes that go to the CC and it will probably stop (under vacuum). Really you should have two CC's in order to clean it all up. One between the VC and rear PCV, and one between the intake manifold and VC.

You are also going to want to get some directional valves and place one only allowing air to go into the IM (so you dont loose boost), and another only allowing air to go out the back to the pre boost intake (to allow vacuum for the crank case).

[CorneliusRox]

A little off topic but just wondering if anyone has every centered there transmission mount, motor mount, snub mount before? I posted a thread asking about it last week and got no replies, but I am sure there are people here that have doen this. There is a lot of threads about it in the B6 section but none with the B7.

I get a horrible rattling noise since the stern transmission mount and the mech that installed it never centered it (center bolt loose, both motor mounts loose and snub mount bracket loose) turn car on idle, A/C full blast then tighten. Same person installed motor mounts and snub mounts so I am sure they need to be centered as well. I hear good things about doing this if not done as far as vibrations be gone from centering the mounts.

I was also just asking about this on a thread and got some insight. You basically loosed the center bolts fot motor mounts, loosen the snub mount holder, and then the bolts on the tranny. Then let it idle for a minute. Put on some gloves on, tighten the bolts (motor mounts last). Chances are, your tranny mount will be bad if it's still stock.

[groundround]

So catch cans are directional (like I was saying on the BFI catch can page). Swap your tubes that go to the CC and it will probably stop (under vacuum). Really you should have two CC's in order to clean it all up. One between the VC and rear PCV, and one between the intake manifold and VC.

You are also going to want to get some directional valves and place one only allowing air to go into the IM (so you dont loose boost), and another only allowing air to go out the back to the pre boost intake (to allow vacuum for the crank case).

it does not matter which line you connect to the ports at the catch can, they are both the same.

[groundround]

I was also just asking about this on a thread and got some insight. You basically loosed the center bolts fot motor mounts, loosen the snub mount holder, and then the bolts on the tranny. Then let it idle for a minute. Put on some gloves on, tighten the bolts (motor mounts last). Chances are, your tranny mount will be bad if it's still stock.

it's not stock it the stern trany mount.

[CorneliusRox]

it does not matter which line you connect to the ports at the catch can, they are both the same.

One throws the junk to the bottom of the can, the other has a tube that goes up to avoid the gunk. (if it's like others I have seen)
What is happening on yours is you are getting a lot of junk from your crank case (valve cover) into your IM just from vacuum.

[groundround]

this can has two ports like the rest, but both on same level at the cc. inside the catch can the is a v shape sheet metal vertical almost the length of the can just not all the way to the bottom. So both ports are exactly the same.

[drumnjuny]

snub mount totally took all the vibrations out of my car. according to the DIY i found from APR, i think it was, for the snub mount only (not the other motor mounts), tighten the allen that holds the snub mount to the tranny, and loosen the 13mm bolts on the bracket. "run the car on idle, and give it small throttle inputs for 30-45 seconds" to center the mount. turn off the car and tighten the bracket down. i fucked up and did it wrong, somehow no vibrations anyway haha.

[groundround]

snub mount totally took all the vibrations out of my car. according to the DIY i found from APR, i think it was, for the snub mount only (not the other motor mounts), tighten the allen that holds the snub mount to the tranny, and loosen the 13mm bolts on the bracket. "run the car on idle, and give it small throttle inputs for 30-45 seconds" to center the mount. turn off the car and tighten the bracket down. i fucked up and did it wrong, somehow no vibrations anyway haha.

Sorry i did not mention in the prior post.

I have replaced the motor mounts with 034 high density, I have replaced the snub mount from ecs high density, and now just replaced the transmission mount (sterns). the mech that installed the tranny mount did not center it (middle bolt loose etc... run blah blah) or did not center all the others now I am thinking. But with the sterns tranny one it has some metal around the outer edge and is causing some very bad vibration on acceleration and deceleration. I want to center all of them together just wanted to make sure about the loosening and idling the car part before i went and did it.

So this has helped with what I need to do. Also sterns replied to me in an email and said that I need to center them all this way and I was just double checking.

[CorneliusRox]

this can has two ports like the rest, but both on same level at the cc. inside the catch can the is a v shape sheet metal vertical almost the length of the can just not all the way to the bottom. So both ports are exactly the same.

Well, you could get some of these (http://www.usplastic.com/catalog/ite...6844&catid=489) and then run it to atmosphere. The only downsides to this would be that there is no vacuum sucking that stuff out of your crank case, and you might occasionally get a drop of oil gunk out of the tube. But your valves would LOVE you (and you non-oil-filled intercoolers).

[DRAKLORE]

My car smokes like crazy at idle, ever since installing the CC. The block off causes a ton of smoke.

[groundround]

My car smokes like crazy at idle, ever since installing the CC. The block off causes a ton of smoke.

the block off on the IM? hmmm so what if I tap into it for my boost guage (bfi comes pre tapped optional with a fitting to run a boost guage or block it), do you think that would stop the smoking at idle? right now i tapped into my DV tubing (AWE) for boost guage, I might just try the BFI block off to see what happens if I think about it long enough LOL but right now it does not make sense for that to stop the smoking at idle.

[thenofjboy]

where is the smoke coming from BTW? From the block off on the IM?

[groundround]

no out of the exhaust.

[groundround]

catch can if anyone is interested

[Charles.waite]

This is awesome. Us b6 guys go to GREAT lengths to eliminate all those fucking Check Valves and you guys are advocating adding some?! Haha, I love it.

The root of this issue I believe is that fact that there is no one-way/check valve maintaining the pressure in the crankcase. So yes I think some check valves could be in order. Or you could just keep the factory PCV system which has all this built in. Its like you are taking a simple system, simplifying it with the BSH thing, then complicating it with the catch can, then complicating it even more with the check valves. Honestly, I'm not sure why you would go through all this hassle. You're purposefully introducing MANY more points of failure into a very simple system, even when completely stock.

I say this a lot about the b7->b6, but you guys should be glad you don't have the PCV system from the B6/1.8t. There are 7 check valves, countless hoses, tons of one-time-use clamps, 3 different revisions of the system depending on model year/VIN, multiple parts that cost upwards of $80.

Seriously you guys don't know how good you have it.

[groundround]

huh?

I have had nothing good from our stock PCV valve especially when you go stages higher boosting more. I do agree that 1 check valve in one of the lines going to the catch can would benefit but this simple 2 lines out to a catch can is about as simple as you can get.

[Charles.waite]

How is the PCV affected by increased boost levels? Higher crankcase pressures?

I'm mostly talking about adding lines and hoses and check valves. Its just asking for Vac leaks and check valve failures. I would do anything to have as simple a system as the stock b7 PCV in my b6. Not saying its the be all end all solution, just saying I don't get why people feel the need to, essentially, disable a perfectly decent system. Yea it can be failure prone, but its an easy fix when it does fail.

[lIRATIl]

We take the PCV out so we don't get shitty carbon buildup. Something a B6 doesn't get as bad.

[CorneliusRox]

How is the PCV affected by increased boost levels? Higher crankcase pressures?

I'm mostly talking about adding lines and hoses and check valves. Its just asking for Vac leaks and check valve failures. I would do anything to have as simple a system as the stock b7 PCV in my b6. Not saying its the be all end all solution, just saying I don't get why people feel the need to, essentially, disable a perfectly decent system. Yea it can be failure prone, but its an easy fix when it does fail.

it basically breaks the check valve

[034Motorsport]

How is the PCV affected by increased boost levels? Higher crankcase pressures?

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.

[CorneliusRox]

I am glad that you took a picture of the new CC. Interesting design. Looks like a good idea. I definitely think you should toss in a check valve, specially if you didnt do anything special on the rear PCV

[groundround]

I am glad that you took a picture of the new CC. Interesting design. Looks like a good idea. I definitely think you should toss in a check valve, specially if you didnt do anything special on the rear PCV

For the rear PCV I was thinking about the euro jet tube, it is basically a tube with a check valve LOL

[CorneliusRox]

ha ha just buy a check valve, use the OEM tube, and throw it all together yourself.

[groundround]

called f-ing lazy, busy moving and packing and travel with work LOL.

plus the OEM tube is a thin plastic hard brittle POS

[CorneliusRox]

called f-ing lazy, busy moving and packing and travel with work LOL.

plus the OEM tube is a thin plastic hard brittle POS

fair enough. then grab their tube and let me know how you like it. I like the vacuum idea but I dont like the 'going back into your system' idea. I might block it and figure something else out.

[jmarch1122]

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??