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Old 11-30-2004, 03:02 PM   #1
Padge
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Default Can you hear your stock STi BOV?

I remember reading somewhere that people claim you can't hear your stock BOV on the STi. Well I just bought one from an older man who barely drove it ('04 with 3100 miles) and did not mod it, and I can definitly hear the BOV when I shift.

Like I said, the car is completely stock... is this the case for anyone else?
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Old 11-30-2004, 03:11 PM   #2
frenchtaunters
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I cant hear a thing man, however i also havent gone above 5000 rpms yet, still in the first 1000 miles and taking no chances
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Old 11-30-2004, 03:17 PM   #3
STi-MAN
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yea u can hear the bypass valve.
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Old 11-30-2004, 03:19 PM   #4
Ryokosman
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I've recently put the intake elbow in my 05 STi. Just now I can BEARLY hear any BOV. But just bearly and you have to listen for it... Was hoping for a little more noise when I put the elbow on...

Ryokosman
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Old 11-30-2004, 03:26 PM   #5
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Quote:
Originally Posted by Padge

Like I said, the car is completely stock... is this the case for anyone else?
It's not BOV. It's called ByPass Valve

You can hear the pfft but kinda muted.

Wait till you remove the intake resonator or when you upgrade to a K&N Typhoon or some other short ram. You'll hear the whoosh noises even better
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Old 11-30-2004, 03:27 PM   #6
SLIGHTLY
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no blowoff valve, only a bypass valve
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Old 11-30-2004, 03:33 PM   #7
Padge
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are you serious? I thought that swoosh was a BOV... sounds identical.

Can you please explain the purpose of the bypass valve? I know in my honda I removed it (and I never heard a peep out of it).

Thanks guys!
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Old 11-30-2004, 03:35 PM   #8
kool168
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the stock unit is call by pass valve
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Old 11-30-2004, 03:44 PM   #9
Padge
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ok... so there is no BOV, just a Bypass valve. They serve similar purposes?
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Old 11-30-2004, 03:50 PM   #10
SLIGHTLY
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Quote:
Originally Posted by Padge
ok... so there is no BOV, just a Bypass valve. They serve similar purposes?
more or less one vents into the intake and the other just vents
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Old 11-30-2004, 03:51 PM   #11
punga
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Ok first welcome to the board..Second read the sticky at the top of the newbies & FAQs . I think you will find alot out about questions that are asked alot..

J.C.
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Old 11-30-2004, 04:09 PM   #12
Padge
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^^^ I will do that now. Thanks!
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Old 11-30-2004, 05:08 PM   #13
Rev1
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Quote:
Originally Posted by Padge
ok... so there is no BOV, just a Bypass valve. They serve similar purposes?
The BPV recirculates the air back into the turbo inlet instead of venting it to the atmosphere like a regular BOV does. For that reason it doesn't sound as loud as a BOV.
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Old 11-30-2004, 11:55 PM   #14
Subie FA20
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Quote:
Originally Posted by Padge
I remember reading somewhere that people claim you can't hear your stock BOV on the STi. Well I just bought one from an older man who barely drove it ('04 with 3100 miles) and did not mod it, and I can definitly hear the BOV when I shift.

Like I said, the car is completely stock... is this the case for anyone else?
Old man? The subie dealer in Englewood NJ tried to sell me an '04 STi WRB with about 3k miles who claimed it belonged to an old man. Is this the same one we're talking about?
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Old 12-01-2004, 09:47 PM   #15
hoku123
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haha not that this has anythign to do with the thread, but my previous owner was an old man who babied the car too(according to the dealer).... haha perhaps this is a new technique that dealers are using... .... man they really got me there
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Old 12-02-2004, 01:03 AM   #16
SubieRX
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Yeah, the by pass valve is definitely audible especially if your in 5th or 6th gear. Give it a little gas and then let go. It was fun for a few miles when I first got the car.
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