"The BIG BOV thread" (Where all bov question threads get merged) - Page 691

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 Arubiccube again many thanks No problem....

  1. #10351
    Registered User gprwrx's Avatar
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    Quote Originally Posted by Arubiccube View Post
    again many thanks
    No problem.
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    Registered User STilinRyan's Avatar
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    APS makes a Dual Port BOV that both recirculates and vents to atmosphere depending on how much boost you are running. It works awesome and with a short ram intake sounds very nice as well. APS ALL THE WAY!!!

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    Master Baiter EJ257's Avatar
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    Quote Originally Posted by STilinRyan
    APS makes a Dual Port BOV that both recirculates and vents to atmosphere depending on how much boost you are running. It works awesome and with a short ram intake sounds very nice as well. APS ALL THE WAY!!!
    Wrong! The APS is a fully-VTA valve.
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    The stock piece is the best one there is.

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    Registered User Oak1ey's Avatar
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    Everyone knows I have an opinion but to be honest I am keeping well out of this thread.

    Bye Bye and good luck
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    Thumbs up Which bov?!?!?!?!?!

    I' am trying to decide between the Greddy Type RS Blow Off Valve-$190 or the TurboXS Type H-RFL Blow Off Valve-$172.10


    Can someone just guide me in the general direction to which one is better.

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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Both of those are good products when used in the right application...
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    Quote Originally Posted by teflon_jones View Post
    Both of those are good products when used in the right application...
    +1 if either is set-up correctly they'll be fine.

    IMO thats a waste of money. i would rather buy an up-pipe/dp for that money and gain something out of it.
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    Registered User AyOh's Avatar
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    That thread helped me out a lot. Is your Rex stock or have you done anything to it? From everything I hear and read, it's pointless unless you're running 20 psi or more. (Even though I'd love the "show" off valve myself )

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    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Quote Originally Posted by AyOh View Post
    Is your Rex stock or have you done anything to it?
    mod list can be found here:

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    Hey, I never meant any harm... I was responding to a post, and figured the information meatn more than the vernacular, and now feel kinda dumb for having touched the keyboard. At any rate, the car is on a lift, my mechanic baffled as to why I have turbo spindle chatter, while the car was a lease-to-own which apparently underwent extensive mods, with a 5" pipe off of a stock turbo... which is why he is scratching his head. All the seals are new, so is all the tubing... "Oh, it had to have had a bigger turbo... and ..." ... He is still confused as to why the car has all this crazy stuff, and a stock turbo. The intercooler almost hits the hood on both sides it is so wide. It looks like someone stuck an FMIC under the scoop. At any rate, I have the stock turbo and BPV with spankin' new hardware and seals... SO he is going to find me a ball bearing turbo and mount kit, and we are searching for a BOV/BPV, installation requirements are not an issue. I basically wanted to know what the ultimate end to the argument is... what is the best EJ20 BOV/BPV, and why?

    I can't see how there are hundreds if not thousands of posts on a sunject with no real right answer, but wow!, is everyone opinionated about what IS best!!

  15. #10364
    Geriatric Ginger Mod Rogan's Avatar
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    Bottom line is, a non-stock BPV is absolutely moot, on anything under 20psi, with exception to something like a billet unit.. More just for accuracy/speed.
    Over that pressure/volume, you'd need to look into going bigger.
    BOVs on non-speed density (NSD) EMS' cause a ton of issues, which has been stated at least 690 times (thread page length)..

    Not to say they cant be used in NSD setups, but they cause more problems than they help..

    That's not an opinion, that's experience.
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  16. #10365
    Moderator Donkey's Avatar
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    Quote Originally Posted by Impreza2.0 View Post
    I basically wanted to know what the ultimate end to the argument is... what is the best EJ20 BOV/BPV, and why?
    Poor naive child.Thats like asking "Who is the best football team and why?" Everybody has an opinion,some more educated than others.Like everything else in life,this is just another debatable subject.
    Quote Originally Posted by Impreza2.0 View Post
    I can't see how there are hundreds if not thousands of posts on a sunject with no real right answer
    You obviously bypassed most of the links that contained more technical info.I'll humor you:

    BOV FAQ: The REAL dirt on BOVs. Ups AND downs. Lets dispell some myths. - NASIOC
    Blow-Off Valve Info
    Blow-off Valves
    Blowoff valve - Wikipedia, the free encyclopedia

    Basically any valve not stock will require initial setup and tuning.Also any valve not 100% fully recirculating will require cleaning/rebuilding at some point as it is not sealed to the elements (sand/dirt).Thats whats great about the stock valve.Requires no tuning and is 100% sealed from outside debris.Not saying there are not better,more functional designs out there.The stock on does have it's issues but setting up/tuning an aftermarket VTA BOV is harder than most people think depending on the model and your knowledge level.
    Last edited by Donkey; 01-06-2009 at 10:51 AM.
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