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  1. #1
    Established Member Two Rings
    Join Date
    Mar 26 2009
    AZ Member #
    40368
    Location
    Dub Central (WA)

    Will a breather filter added onto the valve cover cause any problems?

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    If i add on provisions for a breather filter to my ATW valve cover, will this negatively effect the current pcv setup or maf readings in anyway?

  2. #2
    Veteran Member Four Rings somebody5788's Avatar
    Join Date
    Aug 13 2008
    AZ Member #
    31904
    Location
    Indiana

    Quote Originally Posted by WonPointAteTea View Post
    If i add on provisions for a breather filter to my ATW valve cover, will this negatively effect the current pcv setup or maf readings in anyway?
    why??????
    -Nic

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  3. #3
    Veteran Member Three Rings shokwav09's Avatar
    Join Date
    Jul 27 2009
    AZ Member #
    45560
    My Garage
    hhr, 2013 rs5
    Location
    kansas city, missouri

    Quote Originally Posted by somebody5788 View Post
    why??????
    no, just make sure its angled upward with a straight up facing or right angle {elbow} fitting. so when or if oil in your valve cover doesnt leak or spray enough to soak into the filter. youre good to go. if the engine has a recirculatory line it really isnt necessary. unless oil is making its way into the tract.
    I wanna do a burnout at heavens gate in an audi

  4. #4
    Veteran Member Four Rings walky_talky20's Avatar
    Join Date
    Jun 30 2008
    AZ Member #
    30427
    Location
    Erie, Pennsylvania

    You want an AWM valve cover and to just put an air filter on the rear port, instead of plumbing it into the PCV system like on a real AWM?

    The correct answer to this is no, you shouldn't do that. The only way for fresh air to enter the PCV system is through the small metered intake hole in the top of the PRV (pancake valve). By putting a filter on the VC you are allowing way too much flow through the PCV valve. More than the factory setup would usually allow. The spring in the breather valve, the spring in the PRV, and the fuel maps in the ECU are all tuned for the factory amount of PCV flow into the intake.

    By increasing the flow that much you could even have problems with high idle because too much air is bypassing the throttle plate. Also, with such a large opening the crankcase will no longer be under much vacuum. Air will just be flowing through it at almost atmospheric pressure.

    I suggest you either plumb it up like an AWM or don't do it. Don't get me wrong, I like the extra breather on the valve cover. I think it is a good thing to help out with top end sludge formation, etc. Just hook it up right. That said, if you are going to a big turbo and are venting to atmosphere anyway, absolutely. You want as much breathing as you can get.

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