"The BIG BOV thread" (Where all bov question threads get merged) - Page 727
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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; so a 50/50 on a 2009 wrx impreza sounds good??...

  1. #10891
    Registered User Jaysimpreza's Avatar
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    so a 50/50 on a 2009 wrx impreza sounds good??

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  3. #10892
    Registered User c2bcoolwrx's Avatar
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    Quote Originally Posted by Jaysimpreza View Post
    so a 50/50 on a 2009 wrx impreza sounds good??
    Leave the stocker on. No reason to change the BOV unless you are running some serious boost (20PSI+)

    Please read the stickies at the top of the forum and do A LOT of research before you purchase anything for your car. WRXs are a bit more complicated than modding a honda.

    Also please read these:

    Hey everybody new to the forum: READ THIS! - NASIOC

    2008/2009 owners...please read.... - NASIOC

    You have quite a bit of reading/learning to do about your car. So please take it slow before you do something that could possibly damage your engine.

  4. #10893
    Registered User Impreza2.0's Avatar
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    Quote Originally Posted by subydude8 View Post
    so ive read a decent amount about bov's and i know they are bad but for some reason i was wondering are there any good bov's or do they all just suck?
    No, they don't suck, they just are wholly unnecessary in 99% of the applications asked about in this thread.

    Get a boost gauge FIRST. Then you when you find that you are still not nearing 18PSI, forget the valve. If you have a lot of turbo mods, and the support for those mods, and you ARE hitting over 18PSI, get a valve. 50/50 is OK, especially if you can alter the ratio, like the Go Fast Bits piece... best bet is to stay recirculating. It reduces turbo lag, and prevents premature bearing/bushing wear in the compressor.

    Our OEM valves are fast, light, well fitted, and can withstand up to 18PSI boost with no problems. Replacing it means you will have to match it's properties with an unadjusted valve, which is time consuming, and without engine management, tough to do accurately. It is possible to adjust it during test driving, and that is unlikely to hurt anything, but for $45 for the OEM piece, you could have 3 of those before an aftermarket one is payed for.

  5. #10894
    UnBanned Sinister's Avatar
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    Quote Originally Posted by Impreza2.0 View Post
    best bet is to stay recirculating. It reduces turbo lag, and prevents premature bearing/bushing wear in the compressor.
    Can I ask where you got this information? In my 3 years here I haven't heard of bearings in a turbo going out because of a VTA BOV...
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  6. #10895
    Moderator Donkey's Avatar
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    Quote Originally Posted by Impreza2.0 View Post

    and prevents premature bearing/bushing wear in the compressor.
    Ummm...........no.
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  7. #10896
    Pro Manscaper Mikie13's Avatar
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    Quote Originally Posted by Sinister View Post
    Can I ask where you got this information? In my 3 years here I haven't heard of bearings in a turbo going out because of a VTA BOV...
    Yeah...interesting

    BOVs screw with the MAF readings...that's why it causes "problems" in our cars. The ECU is preset to allow for the recirculated boost to be included in the MAF readings, so if you vent to atmosphere, you don't get as much air in the mixture as the ECU thinks, therefore causing it to send the same amount of fuel with less air. Ergo...running rich during shifts.
    The Hawk-Eye Alliance #90|The Blobeye Syndicate #0|The Stink-Eye Mob #0|N.E.R.D. Founding Member & #3
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  8. #10897
    Registered User Jaysimpreza's Avatar
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    are you still gonna have idle problems when the rpm drops if you run with the turboxs 50/50 bpv??

  9. #10898
    Registered User supranai's Avatar
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    So basically you guys are telling me to ditch my hks ssbov and put the ugly plastic thing back on because the air needs to vent back into the system to not throw off the ecu. What would be the next best thing besides the ugly black thing that comes with the car. It's all plastic now. Will a metal unit from an older sti fit in there?
    Last edited by supranai; 11-13-2009 at 05:57 AM.

  10. #10899
    Geriatric Ginger Mod Rogan's Avatar
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    Ever heard the saying "function over form"?

    Apparently, you're in it for the material principal, as your only reference to it is whether it's ugly or not.

    If you want 'bling', get a billet bpv (Forge, etc.) and recirc it, call it done.
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  11. #10900
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    Quote Originally Posted by supranai View Post
    So basically you guys are telling me to ditch my hks ssbov and put the ugly plastic thing back on because the air needs to vent back into the system to not throw off the ecu. What would be the next best thing besides the ugly black thing that comes with the car. It's all plastic now. Will a metal unit from an older sti fit in there?
    A full fledge recirculating bypass valve. No, the older ones will not fit if you're still using your stock TMIC.

    Quote Originally Posted by Impreza2.0 View Post
    and prevents premature bearing/bushing wear in the compressor.
    Huh?

    Quote Originally Posted by c2bcoolwrx View Post
    Leave the stocker on. No reason to change the BOV unless you are running some serious boost (20PSI+)
    The plastic valves of the current generation WRX is not as good as the older metal ones. They leak sooner (~18 psi) so '09 owners who are +stage 2 are more justified in replacing the piece with an aftermarket one.
    Last edited by brfatal; 11-13-2009 at 08:17 AM.

  12. #10901
    Admiral Ackbar the 1st mycologist's Avatar
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    So how much do blow off valves suck?
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  13. #10902
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    Quote Originally Posted by mycologist View Post
    so how much do blow off valves suck?
    14


  14. #10903
    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by brfatal View Post
    14

    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

  15. #10904
    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Like… omg… my stock bpv is sooooo gross and plasticy… ATROCIOUS!!!

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  16. #10905
    Registered User Liquidr1's Avatar
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    take your stock one off. go to walmart and by some chrome paint. Paint the dumb thing and call it a day.
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