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Old 04-21-2010, 09:29 PM   #201
Davenow
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Quote:
Originally Posted by scoobyoutback73 View Post
wow to much info!! bov= problems!! keep it stock! they can handle the power if ya know how to drive!
So basically what you are saying is YOU DIDNT EVEN BOTHER TO READ THE GOD DAMNED THREAD. Before throwing opening your idiot pipe. It has NOTHING to do with handling power. And WTF are you talking about "if you know how to drive???" What the hell does that have to do with a BOV.

Never post in a car forum again, unless it is to ask a question, because you obviously know less than nothing.

<<Is not in a charitable mood today and is calling them as I see them.
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Old 04-25-2010, 02:30 PM   #202
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i have a HKS SSQV, good or bad thing? whats the best way to clean it?
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Old 04-27-2010, 05:10 PM   #203
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thx this really cleared things up
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Old 04-27-2010, 05:14 PM   #204
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Quote:
Originally Posted by scoobyoutback73
wow to much info!! bov= problems!! keep it stock! they can handle the power if ya know how to drive!


Quote:
Originally Posted by Davenow View Post
So basically what you are saying is YOU DIDNT EVEN BOTHER TO READ THE GOD DAMNED THREAD. Before throwing opening your idiot pipe. It has NOTHING to do with handling power. And WTF are you talking about "if you know how to drive???" What the hell does that have to do with a BOV.

Never post in a car forum again, unless it is to ask a question, because you obviously know less than nothing.

<<Is not in a charitable mood today and is calling them as I see them.
he is an idiot but keeping it stock is the easiest way
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Old 04-29-2010, 01:42 PM   #205
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yeah.

I was a bit rough on him though huh... Sorry bout that scoobyoutback73.
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Old 04-29-2010, 01:49 PM   #206
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Quote:
Originally Posted by Davenow View Post
yeah.

I was a bit rough on him though huh... Sorry bout that scoobyoutback73.
Don't think so...

He should of read the thread or read a page or two...

btw, great informational thread..thanku
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Old 05-07-2010, 12:13 PM   #207
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OK, so I've read through this and Unibomber's faq and want to confirm my understanding of bov's.

The only reason to change the bov is if you a) like the sound and/or b) run more than the stock bov can handle (20+ or so)?

Is there any advantage performance wise to changing the bov below 20 psi?
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Old 05-08-2010, 05:06 PM   #208
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so one thing that is missing is how/what to use has lubrication for the bov?s
wd40? liquid wrench?
any ideas?
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Old 05-09-2010, 07:06 PM   #209
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olive oil.......
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Old 05-09-2010, 09:56 PM   #210
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i still think dave should do a write up w/ pics and such about how to maintain a bov. i think that would be a significant help to a lot of noobs... and me.
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Old 05-10-2010, 06:15 AM   #211
vader6
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bomb info
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Old 05-12-2010, 07:36 AM   #212
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Default clean up bov

hi am new here ,soz just a quicky, i have the 2002 bugeye with ,a bov baileys, i have had it 3 years. do i need to clean it at any point <if so whats the best
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Old 05-16-2010, 06:56 PM   #213
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interesting thread. I have had the GFB GT Hybrid BOV on my Legacy for the last year or so. Its currently set to 50/50 and seems to be running fine. But i saw one or two references to GFB valves saying the leak badly?

If i had it set to 100 recirc would this be better than the plastic stock one or am i better of going back to stock BOV?
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Old 05-27-2010, 07:21 PM   #214
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I've been tuning my car lately and ran into a good explaination on why and how the car runs rich for a 500ms or so with a BOV. I thought this would be helpful for people wondering why.

Quoted from RomRaider:
Quote:
Originally Posted by the suicidal eggroll
The air that is bypassed from the BPV is post MAF, but that means it has already been measured. The air that has already been measured is kept in the system, none is taken away (like in an atmospheric BOV), none is added, so no compensation is necessary.

Think of it like this...
You have a car in boost, it's flowing 100 g/s of air.
100g/s is coming through the filter, 100g/s crosses the MAF, 100g/s is ingested in the turbo, 100g/s exits the turbo (compressed now), 100g/s enters the engine. The amount of air crossing the MAF sensor is equal to the amount of air entering the engine, so all is well.

Now you release the throttle to shift gears and the throttle plate closes. With the throttle plate closed, the engine might only ingest 5g/s of air, so let's go into what happens. First off, the turbo cannot slow down instantly. It was pumping 100g/s of air before the throttle plate closed, and it will be pumping 100g/s of air after the throttle plate is closed. Eventually the turbo will slow down so it's only pumping the 5g/s the engine is taking in, but that will take at least a few hundred ms, so what happens in the mean time?

You just released the throttle, the turbo is still pumping 100g/s of air, but the engine is only taking in 5g/s

Case 1: Atmospheric BOV
100g/s is coming through the filter, 100g/s crosses the MAF, 100g/s is ingested in the turbo, 100g/s exits the turbo, 95g/s exits the BOV into the atmosphere, 5g/s enters the engine. You have 5g/s entering the engine, but the MAF is reading 100g/s, problem! This is why you go rich on the shift, blow fireballs out of the exhaust, and delay spool up in the next gear.

Case 2: Recirculating BPV
5g/s is coming through the filter, 5g/s crosses the MAF, that 5g/s is combined with 95g/s coming from the BPV recirculation tube, and 100g/s enters the turbo, 100g/s exits the turbo, 95g/s exits the BPV on it's way back to the turbo inlet, and 5g/s enters the engine. You have 5g/s entering the engine, and 5g/s crossing the MAF, so all is well.


There is no way to tell the ECU, "hey, for the first 500ms after releasing the throttle, the actual air entering the engine is only going to be 5% of what the MAF is telling you, so only add 5% of the fuel that you think you need". It is going to add all the fuel the MAF is telling the engine it needs, and there's nothing you can do about it.

Now in reality, the injectors shut off when the throttle plate is closed, regardless of the MAF voltage, so it won't be quite as bad as illustrated above. The problem is still there though for the first few ms after the BOV opens before the injectors shut off, and the first few ms when you get on the gas, the injectors turn back on, but the BOV is still open venting air.
OP: http://forums.nasioc.com/forums/show...1602235&page=9

CN: The BOV causes the car to run rich for a split second because when it vents into the atmosphere, the enigine will be receiving less air entering the engine than the MAF thinks when it originally read the air and the engine is still compensating for the MAF reading.

CN:
Quote:
Originally Posted by the suicidal eggroll
Case 1: Atmospheric BOV
100g/s is coming through the filter, 100g/s crosses the MAF, 100g/s is ingested in the turbo, 100g/s exits the turbo, 95g/s exits the BOV into the atmosphere, 5g/s enters the engine. You have 5g/s entering the engine, but the MAF is reading 100g/s, problem! This is why you go rich on the shift, blow fireballs out of the exhaust, and delay spool up in the next gear.
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Old 06-01-2010, 02:36 PM   #215
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Yep...lovely thread, lotsa folks should read the first page to clarify a few things about the "common" misconceptions.

On my end, I've gone from OE BPV -> VTA BOV - > OE BPV -> another-brand VTA BOV


Never had any problems with either VTA BOV in terms of idle or anything like that. The latter did have a leak at higher boost, but that was solved by adjusting the spring tension as per instructions for the BOV.

So I'm not sure where these "bad idles"/stuttering problems come from. As a point of interest though, I experimented with the stock BPV for a few hours, running in a VTA mode (plugged the recirc line)....and it actually sounded pretty good ! Ran absolutely horrendous once slowing down to an idle though (the car would stutter alot).

The BPV in this case acted almost like it had a vacuum leak.
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Old 06-29-2010, 07:47 PM   #216
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"BOVs make you a ricer just like owning an SRT-4 makes you a retard."

hahaha. while reading this at work a red SRT-4 pulled up to use our drive up ATM. I lol'ed pretty hard.

Nice thread though! Very useful info. I didn't really knwo anything about BOV's before and always wondered if I should get one. Now I know...
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Old 07-14-2010, 11:00 PM   #217
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I've had muscle cars all my life growing up and making the switch to a Subaru has been great learning experience all over. I personally love the shhhhh sound that bov makes on a turbo car, it gives it character to its performance, man if I could for fun I put one on my 70' chevelle in a heart beat!
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Old 07-15-2010, 02:38 AM   #218
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^
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Old 07-21-2010, 12:17 PM   #219
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Didn't unabomber already do a threa...


Just kidding.

I wanted to chime in quick and thank you for the layman/noob introduction. As one JUST getting bitten by the mod bug, it's very helpful to have a basic resource to use as a stepping-stone for finding and understanding the more readily available in-depth information.
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Old 07-21-2010, 05:35 PM   #220
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Quote:
Originally Posted by Jswansti View Post
"BOVs make you a ricer just like owning an SRT-4 makes you a retard."

hahaha. while reading this at work a red SRT-4 pulled up to use our drive up ATM. I lol'ed pretty hard.

Nice thread though! Very useful info. I didn't really knwo anything about BOV's before and always wondered if I should get one. Now I know...
Honestly if someone said that to me in person I would call them a moron and walk away. That mentality is more ricer than any BOV. Its also a dickhead mentality that isnt good for the scene.

Not to mention that there is a 99% chance that whoever said it, has NO idea what makes a bov good or bad from a performance standpoint.

In my 8 years in the subaru scene, statements like that almost always come from douchebags that know less than the ricers they are making fun of.
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Old 07-22-2010, 02:19 AM   #221
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I did it just for the sake of doing it today. Got a used 50/50 turbo XS. Installed it and done. Does what its supposed to do. Recirculate most of the air and make some noise. No stalling or stuttering. No idle issues. Didn't need any of the supplied washers... not yet anyway

Its not loud and obnoxious but you can definitely hear it.

Yes theres a chance it may leak eventually but oh well. I'll just put the stock one back on... no big deal.
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Old 07-22-2010, 09:29 PM   #222
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Really useful information. Thanks a lot !
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Old 07-25-2010, 11:30 PM   #223
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Quote:
Originally Posted by CKxx View Post
In my own personal experience, when switching, back-to-back, an atmospheric BOV vs. a stock-style recirc valve (on more than one car), there is a very noticeable loss of power after every shift. It almost feels as if the turbo needs to "refill" the intake tract. I know this isn't quite what is happening, but it takes noticeably longer for boost to rebuild after a VTA BOV dumps upon a WOT high-rpm shift.

I would NEVER run a VTA BOV on a MAF-based car unless you really, really love that sound.


(Public Service Announcement - If you have a loud VTA BOV on a vehicle with stock exhaust...you are a ricer/tool. Just letting you know what everyone else thinks as you drive by. )
You must be a TOOL if you think you speak for everyone...
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Old 07-26-2010, 03:13 AM   #224
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.....
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Old 07-26-2010, 03:28 AM   #225
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Quote:
Originally Posted by Davenow View Post
Honestly if someone said that to me in person I would call them a moron and walk away. That mentality is more ricer than any BOV. Its also a dickhead mentality that isnt good for the scene.

Not to mention that there is a 99% chance that whoever said it, has NO idea what makes a bov good or bad from a performance standpoint.

In my 8 years in the subaru scene, statements like that almost always come from douchebags that know less than the ricers they are making fun of.
Disagree.

Ever been to a car meet when a ricer drives by and sounds off his valve? It's usually the more knowledgeable people that mock them.

It IS a mod that is done for purely for attention at the small expense of some performance after all.
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