"The BIG BOV thread" (Where all bov question threads get merged) - Page 695
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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; Originally Posted by NjBuGeyEdWRX +1. theres really no reason for an aftermarket bov. not to mention the hks ssqv bov ...

  1. #10411
    Registered User r0kems0kemrobot's Avatar
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    Quote Originally Posted by NjBuGeyEdWRX View Post
    +1. theres really no reason for an aftermarket bov. not to mention the hks ssqv bov is atmospheric, not really a good idea it causes you to run lean between shifts. i'd go with a recirculating bov[ ex. perrin Perrin Recirculating Blow off Valve (BOV) Kit for 02-07 WRX & 04-09 STi, JSC Speed Inc. ]if you were to upgrade.
    have you or anyone you know tried that one? ive been looking into it but i want some feedback on it first. or if anyone reading this has knowledge of it let me know!
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  3. #10412
    Registered User Oldfart Racer's Avatar
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    Look into a Turbosmart daul port. If you need a BOV.
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  4. #10413
    Registered User Emsbuff124's Avatar
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    hey New guy here to the whole BOV fad i was wondering what is the best one for my car, I want one that wont screw up the Idle, leak or wreak hp. i was looking into the 50/50 BOV right now i have a APS CAI, and a tune, im going to replace the turbo inlet piping soon. I love the sound i get right now, but i want the sound to be head a bitt more outside. What BOV would u guys recommend mind you i will get the BOV tuned into the car once it is installed
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    Quote Originally Posted by r0kems0kemrobot View Post
    have you or anyone you know tried that one? ive been looking into it but i want some feedback on it first. or if anyone reading this has knowledge of it let me know!
    i have that one, and im not too impressed with it. if you have a big tmic, the perrin piece wont fit very well. and you have to periodically check/tighten the screws holding it together. mine ended up backing out, and then nearly exploding under throttle. at least, thats what it sounded like.

    overall, its a janky piece. if youre going to spend money on one, get the aps twin vent. spendy, but its a quality item.
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  6. #10415
    Registered User NjBuGeyEdWRX's Avatar
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    ^^^ +1 my friend does have one on his 04 wrx and it was ok untill he put the bigger tmic on now it has fitment issuses. other then that though he hasn't had any problems with it.


    Quote Originally Posted by r0kems0kemrobot View Post
    have you or anyone you know tried that one? ive been looking into it but i want some feedback on it first. or if anyone reading this has knowledge of it let me know!
    Last edited by NjBuGeyEdWRX; 03-08-2009 at 01:28 PM.
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  7. #10416
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    Quote Originally Posted by Emsbuff124 View Post
    hey New guy here to the whole BOV fad i was wondering what is the best one for my car, I want one that wont screw up the Idle, leak or wreak hp. i was looking into the 50/50 BOV right now i have a APS CAI, and a tune, im going to replace the turbo inlet piping soon. I love the sound i get right now, but i want the sound to be head a bitt more outside. What BOV would u guys recommend mind you i will get the BOV tuned into the car once it is installed
    for starters, you're right in calling it a FAD, for 60-70% of the subarus running them.
    you're a little misguided, when you say you'll get the BOV tuned into the car.. I guess the term "tune" can be used loosely, when referring to setting spring tension, but other than that, there's not real "tune-ability" with the BOV, and how the ECU reacts to the presence of one.

    all in all, only thing I'd recommend is a piston-type BPV to replace the rubber diaphragm unit that is stock, but even that is unnecessary, until 20+psi is common. If you want 'sound', then go with (at most) a 50-50 type. Otherwise, save yourself some possible headache and heartache, and stay with a closed-type system.

    Take some time and read through the - wait.. skim through this thread (ignore the chatter, look for solid info) to find why you should stay away from open-type systems (VTA)..
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  8. #10417
    Registered User Oldfart Racer's Avatar
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    Emsbuff124, Rogan nailed the answer. The stock BPV is good for about 18psi, which is plenty for most. I upgraded to and aftermarket BOV after the stock one failed on me. If you do go with a BOV a 50/50 will work best, but it is all in the tune. I would check around because they are not the same, I run the Turbosmarts.
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  9. #10418
    Registered User Emsbuff124's Avatar
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    yeah i think i shall end the BOV fad and if one comes by i may grab it other than that i think ill save my money for suspension exhaust upgrades
    i live my life a 1/4 mile at a time

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    I'm going to be vf39'd this week, should I start saving for a bov?
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  11. #10420
    UnBanned Sinister's Avatar
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    Quote Originally Posted by gprwrx View Post
    I'm going to be vf39'd this week, should I start saving for a bov?
    no.

    If you're wanting over 20psi then look at the perrin recirc valve, but there's no reason to otherwise.
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  12. #10421
    Registered User gprwrx's Avatar
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    Quote Originally Posted by Sinister View Post
    no.

    If you're wanting over 20psi then look at the perrin recirc valve, but there's no reason to otherwise.
    Thanks!
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  13. #10422
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    ok guysss
    i have a question
    if any 1 knows aabout the greddy type rs Bov
    when i first got the bov i had someone install it for me but i know that the screw that goes out of the bov makes it either "soft or hard " does the soft and hard refer to loud and quiet?

    heres a link of how it looks like http://images.eurotuner.com/featured...ow_Off_Val.jpg

    i just want to know what do i tight or loose .................the nut that holds the screw coming out or move the screw itself

  14. #10423
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    Quote Originally Posted by Skoobie Doo View Post
    ok guysss
    i have a question
    if any 1 knows aabout the greddy type rs Bov
    when i first got the bov i had someone install it for me but i know that the screw that goes out of the bov makes it either "soft or hard " does the soft and hard refer to loud and quiet?

    heres a link of how it looks like http://images.eurotuner.com/featured...ow_Off_Val.jpg

    i just want to know what do i tight or loose .................the nut that holds the screw coming out or move the screw itself
    the screw is the adjuster. the nut is a lock-nut, to keep the screw from moving, once it's set.
    Rogan o_0
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  15. #10424
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    Quote Originally Posted by Rogan View Post
    the screw is the adjuster. the nut is a lock-nut, to keep the screw from moving, once it's set.
    so then i just adjust the nut to make it louder or softer if thats what it means.

  16. #10425
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    Quote Originally Posted by Skoobie Doo View Post
    so then i just adjust the nut to make it louder or softer if thats what it means.
    that's not even close to what it means, or how to do it..

    1. loosen the nut
    2. adjust the screw (in = TIGHT, out = LOOSE).. to further expand on that, the tighter the tension is set, the more pressure it takes to open the BPV.
    3. once adjusted to where it needs to be, tighten the nut to keep the screw from moving during time/vibration.

    Note: a BOV set too loose, or 'soft', can actually sit 'open' during high-vacuum situations, such as idling, or light-throttle cruising.

    Summary: the screw/adjuster does not make a BPV or BOV louder or more quiet, it makes the piston/diaphragm easier/harder to open.

    The volume is determined by how much "boost pressure" is being expelled/rerouted, as well as the actual design if the BPV/BOV. 5psi will be a lot softer sounding than, say, 20psi.
    Think of yourself exhaling.. normal breathing is very quiet, because a minimal amount of 'pressure/volume (as in mass, not audible)' is being expelled. After a sprint, your breathing is much louder, because you are now expelling a greater volume/pressure of air.

    understand, now?
    Rogan o_0
    '96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
    '01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk - 900 lb/ft - SOLD
    '97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties - 750 lb/ft

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