"The BIG BOV thread" (Where all bov question threads get merged) - Page 756

This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Mikie13 It will. Or even more so with an SRI or just a snorkus delete to the ...

  1. #11326
    Gold Member lokey's Avatar
    Join Date
    Jan 2011
    Location
    Crofton, MD
    Posts
    2,177
    I Support ClubWRX
    Quote Originally Posted by Mikie13 View Post
    It will. Or even more so with an SRI or just a snorkus delete to the airbox (which you can't do with your generation WRX from what I understand).

    That's why we always suggest if you really want the sound, you're better off getting an Intake and tuning for it.
    +1. An intake will give the sound. Tune for it, of course. Until your boost gets over 18ish, the stock BPV is reliable and plenty loud with a SRI. Beyond that, you risk leaks.
    * * PART-OUT IN PROGRESS. SEE FIRST POST. EMAIL REASONABLE OFFERS TO GREG.LOKEY@GMAIL * *

    Greg

    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

  2. Remove Advertisements
    ClubWRX.net
    Advertisements
     

  3. #11327
    Registered User
    Join Date
    Dec 2011
    Location
    Ft. Bragg
    Posts
    7

    blow off valve

    A friend of mines gave me his NGR blow off valve off his AE86 and i was wondering since my sti has a wastegate would it be smart to put a blow off valve on it.

  4. #11328
    Registered User irvin787878's Avatar
    Join Date
    Jun 2009
    Location
    Milesburg / Near State College PA
    Posts
    1,218
    Your Sti already has one one it. Is your Sti basically stock? If so, Stick with OEM its more reliable. Just my 2cents.
    Last edited by irvin787878; 01-01-2012 at 11:21 AM.
    HAWK-EYE ALLIANCE #7878
    2007 WRX TR
    My work in progress. http://www.clubwrx.net/forums/off-to...ld-thread.html

  5. #11329
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,149
    I Support ClubWRX I Support ClubWRX
    Aftermarket blow off valves cause problems. The stock one that came with the car is the best (unless you're running a huge turbo with a built engine).

  6. #11330
    Registered User
    Join Date
    Dec 2011
    Location
    Ft. Bragg
    Posts
    7
    hey im moving to ft hood texas im not sure if your familiar with the area but are there any good shops out there because i am looking to rebuild the engine

  7. #11331
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,149
    I Support ClubWRX I Support ClubWRX
    Most of the Ft. Hood crew take their cars to AWDTuning in Flower Mound.. there's actually quite a few guys down there with some pretty expensive built Subies.

  8. #11332
    Gold Member lokey's Avatar
    Join Date
    Jan 2011
    Location
    Crofton, MD
    Posts
    2,177
    I Support ClubWRX
    Quote Originally Posted by MainFrame View Post
    Aftermarket blow off valves cause problems. The stock one that came with the car is the best (unless you're running a huge turbo with a built engine).
    If you're on even an OTS stage 2 tune, you should replace the stock BOV, which is prone to leaking at >18 psi.
    * * PART-OUT IN PROGRESS. SEE FIRST POST. EMAIL REASONABLE OFFERS TO GREG.LOKEY@GMAIL * *

    Greg

    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

  9. #11333
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,149
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by lokey View Post
    If you're on even an OTS stage 2 tune, you should replace the stock BOV, which is prone to leaking at >18 psi.


    I guess it depends on the year model. Mine never leaked. The pressure differential between the the two sides of the BPV keeps the valve closed. I even remember seeing a test someone did with the Forge BPV where they removed the spring entirely, and the diaphragm stayed closed at 20psi because of the pressure differential. Leaking is very common with aftermarket BOVs though. Most will leak even at idle.

  10. #11334
    Master Baiter EJ257's Avatar
    Join Date
    Aug 2007
    Location
    On a stream bank somewhere
    Posts
    19,722
    I Support ClubWRX
    Quote Originally Posted by lokey
    If you're on even an OTS stage 2 tune, you should replace the stock BOV, which is prone to leaking at >18 psi.
    Replacing the valve isn't the issue, I don't believe; it's an issue of recirculating vs atmospheric valves
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

  11. #11335
    Registered User GarrettKoonsman's Avatar
    Join Date
    Apr 2009
    Location
    CO
    Posts
    2,664
    Quote Originally Posted by lokey View Post
    If you're on even an OTS stage 2 tune, you should replace the stock BOV, which is prone to leaking at >18 psi.
    Is this true?? I can't imagine the '11 valve is designed that poorly. 02-07 stock valves are good for more than that.

    If it is, do not put a cheap valve on, buy a VERY high quality 100% recirc valve.
    2003 Midnight Black Pearl WRX Sedan
    200.7 AWHP Protuned Stage 2 at 5400ft above sea level
    Bugeye Mafia Member #225
    Mods
    Pics

  12. #11336
    Subaru Newb MainFrame's Avatar
    Join Date
    Sep 2002
    Location
    Texas, United States
    Posts
    8,149
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by EJ257 View Post
    Replacing the valve isn't the issue, I don't believe; it's an issue of recirculating vs atmospheric valves


    That's pretty much it. Although there are probably some poorly designed recirc valves that have problems. When most people talk about buying a BOV they're talking about atmospheric types, which we all know are prone to leaking, not to mention the fact that they dump air that has already been metered by the MAF, causing the car to run extremely rich for brief moments.


    I never had a problem with my stock BPV.. when I bought my second WRX it came with a TurboSmart atmospheric BOV, which leaked. I traded that for a HKS SSQV atmospheric BOV, which also leaked. Now that I'm running a Forge Recirculating Race type BOV I have no problems, even at 25psi.

  13. #11337
    Gold Member lokey's Avatar
    Join Date
    Jan 2011
    Location
    Crofton, MD
    Posts
    2,177
    I Support ClubWRX
    Quote Originally Posted by MainFrame View Post
    Now that I'm running a Forge Recirculating Race type BOV I have no problems, even at 25psi.
    +1. This is what I have as well.
    * * PART-OUT IN PROGRESS. SEE FIRST POST. EMAIL REASONABLE OFFERS TO GREG.LOKEY@GMAIL * *

    Greg

    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

  14. #11338
    Pro Manscaper Mikie13's Avatar
    Join Date
    Oct 2006
    Location
    Palmyra, NJ
    Posts
    20,770
    Quote Originally Posted by GarrettKoonsman View Post
    Is this true?? I can't imagine the '11 valve is designed that poorly. 02-07 stock valves are good for more than that.

    If it is, do not put a cheap valve on, buy a VERY high quality 100% recirc valve.
    I've heard the newer ones are worse due to plastic. My 07 STI held perfectly fine running 20.5lbs of boost. Never had a leak issue with that stocker.
    The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
    2012 Lightning Red WRX Sedan Stock...for now Soon to be OpenSource tuned by: Mattypants @ WTF Tuning
    "If I have 10 ice cubes and you have 11 giraffes, how many pancakes can fit on the roof? Purple, because aliens don’t wear hats" -Ying

  15. #11339
    Registered User Ruh Roh's Avatar
    Join Date
    Dec 2011
    Location
    Pottstown PA
    Posts
    3,247
    my friend gave me a turbo xs bov that was 5050 like atmospherical and recirculating, i had it on for about a day and theres no need unless u want the sound or have a built engine. i put an intake on and took the bov off and it still sneezes as loud with just the intake. save it for when u have a built engine

  16. #11340
    zax
    zax is offline
    ¯\_(ツ)_/¯ zax's Avatar
    Join Date
    Nov 2008
    Location
    Neverland Ranch, Maryland
    Posts
    12,871
    I Support ClubWRX I Support ClubWRX
    Quote Originally Posted by Ruh Roh View Post
    my friend gave me a turbo xs bov that was 5050 like atmospherical and recirculating, i had it on for about a day and theres no need unless u want the sound or have a built engine. i put an intake on and took the bov off and it still sneezes as loud with just the intake. save it for when u have a built engine
    Explain why it would make a difference if you have a "built motor." As far as I'm concerned, the demand for a VTA BOV will not change if you have forged internals or stock internals. The only time that a VTA BOV makes sense is if you have converted to a blow-through MAF system. Even then, compressor surge is a thing of the past...
    2015 CWP WRX STi ... But how did I get roped back into an EJ motor?!
    Zax's utterly unimaginably stock 2015 STi build thread
    Zax's Shaggin' Wagon Build Thread Now tuned for 99% pure Unicorn Jizz!

    Zach | Moderator -- Mid-Atlantic States, Tech & Modifying & General Repairs
    Rollin' with the Bugeye Mafia #302 | N.E.R.D. Subject Zero
    Facebook me here

    Your Mid-A local board: http://www.clubwrx.net/forums/mid-atlantic-states/

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •