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Old 12-19-2008, 04:15 PM   #101
Broxma
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Look, there are two well known facts around here.

1) If you run a cold air intake on your car it WILL BLOW UP!!!! This is fact, just search.
2) If you run a VTA BOV your car WILL BLOW UP!!!! I think we've covered this many times in the past.

Another well known fact...

Running a DP with out a tune, YOUR CAR WILL BLOW UP!!!! Oh and headers DO NOTHING!!!!, might BLOW THE CAR UP!!!! Ummm, 19 psi on a TD04 and you WILL BLOW UP YOUR CAR!!!! Let's see....the stock air box is NOT A RESTRICTION!!!! and upgrading it will DO NOTHING!!!! except maybe BLOW YOUR CAR UP!!!

I assure you some light searching and you will find a post saying exactly these things somewhere, most of them based on 6 year old examples and absolutely no data to back it up. All of which has already been dispelled as myth but linger on due to people referring others to read outdated worthless posts.

The search button needs a cutoff, maybe a 3" QTP, which WILL BLOW UP YOUR CAR!!!! btw, but regardless, a cutoff on how far it goes back to search. In the Subaru world, with ideas and realities going in diametrically opposed directions every few years, the ability to get accurate information is only as good as your ability to get current data and opinions, not some stone age guesses from washed up old timers who don't change or update with the times.

No import will ever be faster than a V8.
No import will ever run 10's, 9's, 8's, 7's 6's.
No import will ever break 200 mph in the 1/4.
No stock STI block can handle 500 whp.
No stock turbo STI will get into the 11's.

The only universal truth ever posted is that modding your car will cost money. Other than that, it's a craps shoot.

Data? I have some. The over rich condition from running a VTA BOV lasts exactly as long as it takes to shift the gear and put your foot back into the gas, at which point the computer no longer cares about the air it missed the last time around.

Founder - NASIOC Anti-Naysayer Foundation for Truth in Motorsports

/brox
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Old 01-07-2009, 11:08 PM   #102
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This needs to be bumped something awful
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Old 01-07-2009, 11:28 PM   #103
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great writeup

answers alot of questions
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Old 01-08-2009, 12:39 AM   #104
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Quote:
Originally Posted by Broxma View Post
Look, there are two well known facts around here.

1) If you run a cold air intake on your car it WILL BLOW UP!!!! This is fact, just search.
2) If you run a VTA BOV your car WILL BLOW UP!!!! I think we've covered this many times in the past.

Another well known fact...

Running a DP with out a tune, YOUR CAR WILL BLOW UP!!!! Oh and headers DO NOTHING!!!!, might BLOW THE CAR UP!!!! Ummm, 19 psi on a TD04 and you WILL BLOW UP YOUR CAR!!!! Let's see....the stock air box is NOT A RESTRICTION!!!! and upgrading it will DO NOTHING!!!! except maybe BLOW YOUR CAR UP!!!

I assure you some light searching and you will find a post saying exactly these things somewhere, most of them based on 6 year old examples and absolutely no data to back it up. All of which has already been dispelled as myth but linger on due to people referring others to read outdated worthless posts.

The search button needs a cutoff, maybe a 3" QTP, which WILL BLOW UP YOUR CAR!!!! btw, but regardless, a cutoff on how far it goes back to search. In the Subaru world, with ideas and realities going in diametrically opposed directions every few years, the ability to get accurate information is only as good as your ability to get current data and opinions, not some stone age guesses from washed up old timers who don't change or update with the times.

No import will ever be faster than a V8.
No import will ever run 10's, 9's, 8's, 7's 6's.
No import will ever break 200 mph in the 1/4.
No stock STI block can handle 500 whp.
No stock turbo STI will get into the 11's.

The only universal truth ever posted is that modding your car will cost money. Other than that, it's a craps shoot.

Data? I have some. The over rich condition from running a VTA BOV lasts exactly as long as it takes to shift the gear and put your foot back into the gas, at which point the computer no longer cares about the air it missed the last time around.

Founder - NASIOC Anti-Naysayer Foundation for Truth in Motorsports

/brox

You forgot


If you are driving in any sort of non warm dry weather on RE92s, your car WILL BLOW UP!

If you are driving on Falken Azenis and you hit water, YOUR CAR WILL BLOW UP!

If someone kills you, THEY WERE HACKING! oh wait this isnt the counterstrike forums...
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Old 01-08-2009, 01:43 AM   #105
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Quote:
Originally Posted by Defiant Autospeed View Post
If you are driving on Falken Azenis and you hit water, YOUR CAR WILL BLOW UP!...

It's true, I'm serial!















But for realz, I've lit up 3rd from a roll in a straight line on slick roads with a baby 2.0 and EvoIII

Last edited by Audiosavvy; 01-08-2009 at 01:50 AM.
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Old 01-08-2009, 02:24 AM   #106
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Quote:
Originally Posted by Audiosavvy View Post
It's true, I'm serial!















But for realz, I've lit up 3rd from a roll in a straight line on slick roads with a baby 2.0 and EvoIII
I lite up second from a roll on dry roads on 245 azenis And I am down a good 100whp from where I can be.
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Old 01-08-2009, 02:26 AM   #107
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Quote:
Originally Posted by Defiant Autospeed View Post
I lite up second from a roll on dry roads on 245 azenis And I am down a good 100whp from where I can be.

I run the 225s. I love these tires, but they are NOT weather-friendly
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Old 01-08-2009, 12:28 PM   #108
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Back in to correct homework papers. (see post #99)

Everyone pass their papers to the front please.

I'm free now to delete double posts.......



jack
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Old 01-09-2009, 09:48 AM   #109
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Quote:
Originally Posted by Davenow View Post
1. BOVS make you run rich.
--No they do NOT! Here is why. When you are idling, driving around, and under boost, the BOV is CLOSED just like stock. The only way to be running rich is if the BOV was somehow letting air out post maf, WHILE RUNNING, constantly. The exception to this would be a valve that is leaking REALLY badly, and in a case like this, you will know there is a problem right away anyway, as the car will probably barely run. For it to leak this badly, it would have to be physically damaged or just REALLY f'd up

When I am driving around/under slight boost my stock BPV is open or partially open.. I can hear it through my OMG CAI... Maybe my stock turbo flows enough air to overcome the spring at part throttle?



Since the OEM valve is not adjustable without a hammer.. Do you suggest my OEM bov is screwed up? Car was 100% stock for 95K miles.
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Old 01-09-2009, 12:15 PM   #110
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Quote:
Originally Posted by mike280 View Post
When I am driving around/under slight boost my stock BPV is open or partially open.. I can hear it through my OMG CAI... Maybe my stock turbo flows enough air to overcome the spring at part throttle?



Since the OEM valve is not adjustable without a hammer.. Do you suggest my OEM bov is screwed up? Car was 100% stock for 95K miles.

You're probably just hearing your turbo spooling up.....

and/or wastegate flutter.
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Old 01-20-2009, 08:04 PM   #111
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Quote:
Originally Posted by mike280 View Post
When I am driving around/under slight boost my stock BPV is open or partially open.. I can hear it through my OMG CAI... Maybe my stock turbo flows enough air to overcome the spring at part throttle?



Since the OEM valve is not adjustable without a hammer.. Do you suggest my OEM bov is screwed up? Car was 100% stock for 95K miles.
The unmodded BPVs on our cars are normally open at idle and part throttle conditions,but what you're hearing is more than likely just the turbo spooling at 12mph.
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Old 01-21-2009, 02:22 AM   #112
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Nevermind...

Last edited by Beancooker; 01-21-2009 at 09:58 AM. Reason: Don't dodge the swear filter por favor
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Old 01-21-2009, 02:37 AM   #113
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Beancooker, please read the rules of the forum. Dodging the swear filter is a no-no. Only a warning, no points, but please don't do that again

Last edited by Audiosavvy; 01-21-2009 at 03:17 AM.
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Old 01-21-2009, 02:38 AM   #114
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I am impressed that you said "craps shoot".
Most peeps tell me that if i leave that big wheel gap my car will blow up.
To which i reply, "i could care less, life is a crap shoot"
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Old 03-17-2009, 01:51 PM   #115
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This FAQ has so much negativity. It has %1 good info (thanks Davenow) and %99 negativity and baseless facts thrown around.

Can I get more good info on BOV's? I know this thread is trying to keep it simple stupid, but why isn't the HKS SSQV on the 'approved' list? What about Synchronic? Yes I've searched and read the reviews. HKS SSQV doesn't seem to have any worse of a reputation than any other BOV, of course people report the running rich between shifts and back fires. The Synchronic has a lot of propaganda but no real technical explanation or diagrams of it's design. The only somewhat detailed review I've seen were done by Synapse1 who of course is biased being as it's his product and apprently rigged the tests with the Tial BOV or so they claim. It almost seems like there is a negative culture with BOV's and it's kind of creating a stigma for me.
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Old 03-17-2009, 01:56 PM   #116
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The SSQV leaks. Badly. It leaks at stock boost levels sometimes. Its actually one of the worst offenders out there. When someone asks for a price on one, I really try to guide them into some other valve, I'll sell them the SSQV, but not without warning them first.

I never tested the Syncronic, but I have looked at it closely, and read up on it a LOT, and I am a bit hesitant to recommend it. I cant say for sure that it has issues, but they sure put a lot of effort into marketing hype. Which doesnt mean its bad, but its usually not a good sign. There was also the drama you saw. I just dont trust their stuff, and even watching synapse videos on youtube, a lot of people not from nasioc have a lot of bad stuff to say about them. Take that for what its worth, it could be haters with no experience, but there sure is a lot of drama around them.

It brings me back to this. There are a lot of valves out there that are known to work well. Why not just choose from one of them. The TIAL, but, is from all accounts, including my own testing, by far, the best valve on the market. I just wish I sold them

The HKS race valve, the one that looks kinda like the SSQV, but is $500, is also a VERY good valve.



Running rich or backfiring is caused by either a malfunctioning valve, or a misadjusted valve. Its not a symptom of a brand or model, its a symptom of an individual valve or installation issue. And you dont run rich from a BOV anyway, unless its stuck open. You only get that tiny rich spot when it vents. Which is a non issue if the valve closes properly after it vents. Backfiring is a symptom of the combination of a VTA valve that is opening too long (too soft setting) and a tune that is too rich to begin with. If you are backfiring you need 2 things. 1. Adjust the valve a little tighter 2. A good tune, as you are running too rich to begin with, which isnt caused by the valve. The temporary rich after vent spot shouldnt be rich enough to cause afterfire.

Oh that reminds me, its 100% impossible to backfire from a BOV. Its afterfire, which is completely different. If your WRX backfires, its going onthe tow truck the very first time it happens, so you can replace most likely the turbo, and likely many parts in the valvetrain. Backfires are explosions that go out the intake. If its going out the tailpipe, its afterfire. Afterfire is an explosion inthe exh system, almost always post turbo. It really doesnt hurt anything, just sounds bad.

Last edited by Defiant Autospeed; 03-17-2009 at 02:02 PM.
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Old 03-17-2009, 02:06 PM   #117
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Thanks for the info on the HKS SSQV. I read the HKS website on it and it sounded like a really cool idea because the more boost, the tighter it stays shut so it shouldn't have any of the problems of a regular BOV. Guess not!

The Syncronic sounds like an even better idea, but they don't explain enough about it. Synapse1 said it has a piston, but is it metal or plastic? Why is it so cheap? Just a lot of unanswered questions I guess. I might just go with a TIAL.
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Old 03-17-2009, 02:18 PM   #118
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Well, GFB valves have a metal piston and they are useless, the SSQV works better than those. I wont even sell them . So metal or plastic doesnt always mean the difference.

The valves, off the top of my head that worked best

TIAL (best out there)
APS
Perrin
TurboXS (for some reason the 2 RFLs I tested didnt hold as solid, even though internally they appear to be identical, but the normal TXS valves worked very well once spring tension was set properly)
The Greddy was OK at stock boost and up a little. I didnt like how it performed beyond about 15PSI though.
The Blitz was OK as well, I didnt love it though. Was a bit hinky getting it set up just right.


95% of BOV problems come from the fact that 95% of people buy the valve, open the box, bolt it on, and expect it to work properly. And in many cases it does, but in many cases you need to adjust it a little bit. You should always at least check to see it its functioning properly. If you have an idle problem, if your idle changes AT ALL, then you have a leak, its either that your install went wrong, or the valve is open at idle and needs to be adjusted or lubed, or both. That brings me to the next problem. Most people slap the valve on and forget about it. Its a mechanical part, just like everything else, and it needs to be maintained. You should at every oil change, take it apart, clean it with some brake clean, and LIGHTLY lubricate it. I like copper anti-seize. But less is more in this case.

Last edited by Defiant Autospeed; 03-17-2009 at 02:24 PM.
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Old 04-03-2009, 01:23 PM   #119
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Bump for good advice
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Old 12-03-2009, 02:16 PM   #120
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"Generally you can trust
TurboXS"

i got an RFL - i kept on hearing air leaks -

how do you prevent it, what damage is it doing
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Old 12-03-2009, 03:53 PM   #121
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Well it depends how bad its leaking. Leaking will send you rich. If its a minor leak, your ECU will read the front o2 sensor, adjust the fuel trims and bring you back to where you should be. But its no good for power. Otherwise wont hurt a thing.

If its bad, you can go too rich, and it all depends how rich. Could just slow you down, could slow you down and stink, could cause rich misfires or even bore wash (which leads to hosed rings and cyl walls.


What exactly are you hearing? Its virtually impossible to hear a bov leaking, so I am going to go out on a limb and say you arent. I have seen MANY cases where someone hears the sound of the turbo, and assumes its an air leak. Before I say that 100%, tell me EXACTLY what you are hearing, and what the conditions are when it starts and stops.
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Old 12-03-2009, 03:57 PM   #122
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Resurrected from the dead. I vote sticky. So tired of all the heated bov/bpv debates.
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Old 12-03-2009, 04:03 PM   #123
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Daiv I'm stickying this
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Old 12-03-2009, 04:07 PM   #124
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3 stickies in the newbie forum and they still wont make me a mod here I dont think Nick trusts my judgment Im gonna "back him into a corner" at WBM 010 and make him tell me he thinks I am too nuts to trust me with it That's if he doesnt come in here and just confirm it publicly (fair enough if so )
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Old 12-03-2009, 05:38 PM   #125
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I was like this was so not sticked here before. Woot glad my suggestion made it through. I'm just glad someone linked this I was going to search and then make one if I couldn't find it.
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