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Old 03-21-2013, 05:49 PM   #1
SCwrx85
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Default BOV acting funny

So this started as far as i know when i put the BOV (turbo XS type H-RFL) on the car. At light throttle if i shift before 3000rpm its a clear open sound. If i shift at WOT regardless of rpm its fine. Now at light to mid throttle if i shift in between 3000-4000 rpm it doesnt open. The car will rev high during the shift then come back down. I had the BOV on my vr4 last year with no issues. Is this just a subaru thing?
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Old 03-21-2013, 05:54 PM   #2
tec_41
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Is this bov recirculating or venting to atmosphere?

Unless you're tuned for it just about everyone on here will advise you to swap the stock bypass valve back on. The stock computer assumes you have the bpv recirculating air back into the turbo inlet after the maf sensor. If this air is missing it will mess with your readings and cause some interesting issues.
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Old 03-21-2013, 07:20 PM   #3
boosted25
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Quote:
Originally Posted by SCwrx85 View Post
So this started as far as i know when i put the BOV (turbo XS type H-RFL) on the car. At light throttle if i shift before 3000rpm its a clear open sound. If i shift at WOT regardless of rpm its fine. Now at light to mid throttle if i shift in between 3000-4000 rpm it doesnt open. The car will rev high during the shift then come back down. I had the BOV on my vr4 last year with no issues. Is this just a subaru thing?
Even time I see that bov it does the exact same thing. I had mine for about a year and it has always been that way. And the whole bov making the car run rich is hugely exaggerated and misunderstood. It has no negative effect on your car.
People parrot what they read on here constantly so research research research.
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Old 03-21-2013, 07:21 PM   #4
boosted25
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Quote:
Originally Posted by tec_41 View Post
Is this bov recirculating or venting to atmosphere?

Unless you're tuned for it just about everyone on here will advise you to swap the stock bypass valve back on. The stock computer assumes you have the bpv recirculating air back into the turbo inlet after the maf sensor. If this air is missing it will mess with your readings and cause some interesting issues.
Can't "tune" for a bov bud. Sorry.
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Old 03-21-2013, 11:40 PM   #5
tec_41
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Quote:
Originally Posted by boosted25 View Post
Can't "tune" for a bov bud. Sorry.
Sure you can...speed density, "bud".

Last edited by tec_41; 03-21-2013 at 11:59 PM.
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Old 03-22-2013, 12:56 AM   #6
GhostSenshi
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Quote:
Originally Posted by tec_41 View Post
Is this bov recirculating or venting to atmosphere?

Unless you're tuned for it just about everyone on here will advise you to swap the stock bypass valve back on. The stock computer assumes you have the bpv recirculating air back into the turbo inlet after the maf sensor. If this air is missing it will mess with your readings and cause some interesting issues.
This is all you need to know.... Aside from tune part..

/thread
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Old 03-22-2013, 01:21 AM   #7
J-mez
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Old 03-22-2013, 02:21 AM   #8
CanadianImprezaSTi
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Quote:
Originally Posted by tec_41 View Post
Sure you can...speed density, "bud".
I'd hardly call switching to speed density "getting a tune".

On another note, on DSMLink v3 you could actually "tune" for the BOV. There was a script you could activate to stop delivering fuel for a split second after the throttle was released to stop the rich condition right after venting. So it is possible to tune for it but I've never seen anything like that done for Subaru's.

Joel
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Old 03-22-2013, 09:10 AM   #9
jayman4312
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I found your problem

Quote:
Originally Posted by SCwrx85 View Post
i put the BOV (turbo XS type H-RFL) on the car.
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Old 03-22-2013, 09:43 AM   #10
tec_41
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Quote:
Originally Posted by CanadianImprezaSTi View Post
I'd hardly call switching to speed density "getting a tune".
You can tune for a BOV using speed density...But that's kind of the point. Ditch the BOV and use the stock, proven, and reliable BPV.
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Old 03-22-2013, 11:17 AM   #11
PSBeachBum
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The BOV is prolly rusty. Oil it up.
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Old 03-22-2013, 12:32 PM   #12
3dbello
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I'm pretty new to my Subaru WRX myself, but when I had a BOV on my Nissan 240SX with an SR20DET my HKS didn't produce any sound at the midrange RPM that you speak of. It only made a "woosh" sound when it was lower and high RPM. As long as the turbo doesn't flutter I think you're safe. Once the turbo starts fluttering that's when I'd worry.
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Old 03-22-2013, 02:12 PM   #13
jayman4312
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Quote:
Originally Posted by 3dbello View Post
I'm pretty new to my Subaru WRX myself, but when I had a BOV on my Nissan 240SX with an SR20DET my HKS didn't produce any sound at the midrange RPM that you speak of. It only made a "woosh" sound when it was lower and high RPM. As long as the turbo doesn't flutter I think you're safe. Once the turbo starts fluttering that's when I'd worry.
So much of this is bad and/or wrong.

When you hear you're turbo flutter, that's compressor surge. Which contrary to popular believe is not bad for a trubo. Even Corky Bell says it is not bad.

HKS is garbage

Your 240 was using technology thats how many years older than when the wrx was built? My buddies SR20 240 ran fine for a year without the 02 sensor. Those have a lot more room for error, such as using a bad bov.
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Old 03-22-2013, 02:22 PM   #14
boosted25
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Default

Quote:
Originally Posted by CanadianImprezaSTi View Post

I'd hardly call switching to speed density "getting a tune".

On another note, on DSMLink v3 you could actually "tune" for the BOV. There was a script you could activate to stop delivering fuel for a split second after the throttle was released to stop the rich condition right after venting. So it is possible to tune for it but I've never seen anything like that done for Subaru's.

Joel
Good info. I tuned my own dsm and never actually knew that lol
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Old 03-22-2013, 03:08 PM   #15
greenplates
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Default

Turbo's sound cool, BOV'S sound even cooler.



You own a Subaru. buy a honda if you want to hear whistling and shooshing
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