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Old 07-21-2006, 10:31 PM   #51
AsherBishop
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Default HKS BOV Sound Issue???

I just got my first ever WRX today. I am trying to make sense of the previous owners mods. It has a HKS SSVQ BOV with a Recerc fitting but no tubing attached to it. Obviously it is not recircing, but does this make it quiter than without the recirc fitting attached? I was hoping to make it louder.

After reading about the Atmo BOVs causing lag due to fuel ratios I am thinking about recircing the air. But would that make less noise than venting to atmos, or in my current case... venting to atmos with a recirc fitting not attached to anything. Thanks for the help!!!
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Old 07-21-2006, 10:59 PM   #52
BoostinEJ20
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ok, the recirc fitting is a plus since you could rig it up to recirculate.

venting back to intake would make it pretty much silent as opposed to venting to atmo. that hks does leak before stock boost is reached iirc, so try to find a stock bpv if you can and sell that hks and make some money for other mods. what else does the car have for mods?
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Old 07-22-2006, 12:29 AM   #53
AsherBishop
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Default Other Mods

The car also has a $2k StopTech Big Brake kit, Complete racing suspension by Cusco & H&R & KONI, Prodrive exhaust, A'PEXi Turbo Timer, and more I am forgeting.

I do have the stock wastegate, and call me a sucker, but I like the sound of the HKS BOV. If I want to just let it vent to Atmos could I change the way it meters the air fuel ratio? I heard someone say the HKS EIDS (Idle Stabilizer) adjust for atmos BOVs. Is that an option???

Thanks guys!!!
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Old 07-22-2006, 04:25 PM   #54
kirkeemonster
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What about if I get say a BOSCH BPV that makes it a little bit louder than stock, just so I can hear it go pssssh but not loud as **** like all the ricers, would any BPV be better than stock? And would any BPV be better than a BOV
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Old 07-22-2006, 04:40 PM   #55
theicewall
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There is essentially no bov/bpv that's better than stock for stage 2.5 cobb and below, unless you bias your decision heavily on sound. If you want the sound, what I suggest is for you to purchase either a K&N typhoon intake and a recirculating Forge bpv or something of the sort. My buddy at turbometrics just got a few in and has a video clip or two where it sounds pretty good. Im not going to troll or talk up a vendor, so if you would like the link to those video clips just PM me. As long as you have a bpv that doesnt leak it is essentially the same as stock, but you've spent money on it for no performance gain. If the sound is worth it to you, buy an intake and recirculating bpv and it will sound about the same as a 50/50 valve. The best BOV is the Tial valve, but its 500$ and you cant run it without having the same problems of all the other atmospheric venting valves unless you have a hydra ecu with a manifold absolute pressure sensor instead of a mass air sensor. This measures pressure to calculate air volume instead of air velocity through a fixed circumference tube.
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Old 07-22-2006, 04:42 PM   #56
theicewall
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Quote:
Originally Posted by AsherBishop
The car also has a $2k StopTech Big Brake kit, Complete racing suspension by Cusco & H&R & KONI, Prodrive exhaust, A'PEXi Turbo Timer, and more I am forgeting.

I do have the stock wastegate, and call me a sucker, but I like the sound of the HKS BOV. If I want to just let it vent to Atmos could I change the way it meters the air fuel ratio? I heard someone say the HKS EIDS (Idle Stabilizer) adjust for atmos BOVs. Is that an option???

Thanks guys!!!
Yes, Hydra EM with MAP sensor replacing MAF sensor = $$$$$$ & I believe its stand alone.
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Old 07-29-2006, 03:14 PM   #57
alexk243
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I installed a friends ricer BOV just to see what it sounded like and how it affected performance and after about 10 mins of average driving the check engine light came on and the car had trouble idleing. It idled really rough. I think that probebly had something to do with it running to rich.
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Old 07-29-2006, 05:30 PM   #58
Babolat06
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I read your unabomber manifesto and i gotta say, you are doing something that is very appreciated and is helping a lot of people!
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Old 08-04-2006, 05:06 AM   #59
atech_rallyrs
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Correct me if I am wrong, but isnt a BOV also used to prevent a supercharger from trashing your block in accidendental extreme downshift situations, as a kind of one shot deal? Or is this a different kind of BOV.
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Old 08-19-2006, 01:31 PM   #60
Jeremy Gill
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I have a Forester XT. Is the BPV the same as the WRX's? If not, can I use the STI BPV? Will it even make a difference in sound? Mine's really quiet and I'd like to have a subtle sound to it.

Thanks
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Old 08-19-2006, 04:21 PM   #61
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A Subaru BPV is a Subaru BPV is a Subaru BPV.....they are all the same except for the JDM ones, which hold more PSI, but they ALL sound the same.
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Old 09-01-2006, 12:01 PM   #62
Sc00byD00d
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Noob question... but a question none the less:

I have a TurboSmart Dual Port BOV on my stage 2 STi. Right now I have it set up venting to the atmosphere. If I switch it to vent to the intake will I eliminate/reduce some of the backfiring issues I am currently having?

Also the dual port allows for the gases to be vented to both the intake and the atmosphere simultaneously, has anyone tried this? What were your results?

- Scooby
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Old 09-01-2006, 02:50 PM   #63
theicewall
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Quote:
Originally Posted by Sc00byD00d View Post
Noob question... but a question none the less:

I have a TurboSmart Dual Port BOV on my stage 2 STi. Right now I have it set up venting to the atmosphere. If I switch it to vent to the intake will I eliminate/reduce some of the backfiring issues I am currently having?

Also the dual port allows for the gases to be vented to both the intake and the atmosphere simultaneously, has anyone tried this? What were your results?

- Scooby
Yes, you will still run a little bit rich but it will solve your backfiring issues. You should do that immediately. I've tried it, and my results were about the same as stock but with a subtle wooshing sound and less of a tendency for rpms to climb for a split second after releasing throttle.
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Old 09-03-2006, 12:33 PM   #64
druxboyz
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Quote:
Originally Posted by theicewall View Post
If you want the sound, what I suggest is for you to purchase either a K&N typhoon intake and a recirculating Forge bpv or something of the sort.
i thought someone said a few posts up that recirc has no sound to it? i'm looking for a bit of sound without the loss of power, is that possible?
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Old 10-11-2006, 12:58 AM   #65
Dragicon
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good post on the BOV's, i sure like reading info on this type of stuff.
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Old 10-13-2006, 07:20 PM   #66
kirkeemonster
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Quote:
Originally Posted by druxboyz View Post
i thought someone said a few posts up that recirc has no sound to it? i'm looking for a bit of sound without the loss of power, is that possible?
uhm then how come my stock bpv goes PSHH? lol, I just have to be on heavy load, I might get the forge recirc for the sound, but it will be a hell of a lot better than atmospheric, and I should still be able to here the pssh, just a lil louder.
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Old 12-22-2006, 01:13 AM   #67
Kellan
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okay well this thread has confused me more than it's helped me understand.

somebody route/explain the path of the stock BPV in comparison with an atmospheric BOV so I can mentally see the difference.
I've confused the hell out of myself to where the BPV doesn't even make sense now.
If it recirculates after the MAF sensor, it seems like it defeats the entire purpose of blowing off any excess boost since it's re-routed right back into the intake. ugh damn I'm confused.
if somebody could clear up the differences very meticulously for me, it would be much appreciated.
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Old 12-22-2006, 09:33 AM   #68
Knightmare69
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Quote:
Originally Posted by Kellan View Post
okay well this thread has confused me more than it's helped me understand.

somebody route/explain the path of the stock BPV in comparison with an atmospheric BOV so I can mentally see the difference.
I've confused the hell out of myself to where the BPV doesn't even make sense now.
If it recirculates after the MAF sensor, it seems like it defeats the entire purpose of blowing off any excess boost since it's re-routed right back into the intake. ugh damn I'm confused.
if somebody could clear up the differences very meticulously for me, it would be much appreciated.
I'm still a noob at this stuff too but from what I understand, a BPV sends air back into the intake track to keep the turbo spinning, this allows the car to keep power through the rpms during shifting.

A BOV sends excess pressure into the air and thus the turbo looses momentum which in turn causes the slight hic-up between shifts because it's like running and then kinda tripping?

In any, I'd like to get the Forge BPV but I'd like to hear what it sounds like so if someone could post a clip or something that would be helpful.
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Old 12-22-2006, 11:17 AM   #69
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Look at your OEM BPV. There is a large hose that goes from it back into your intake towards the left of your car. This is the recirculation path, excess pressure is relieved and goes back into the intake from the BPV through the hose. With an aftermarket unit, it replaces the OEM BPV and when it relieves pressure it does so through the BOV itself either through ports around the BOV or sometimes through a "horn" that is physically mounted to the BOV.
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Old 12-23-2006, 03:57 PM   #70
Kellan
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I understand that. What doesn't make a whole lot of sense to me is:
if the air you blow off get's immediately re-routed back into your intake tract, what was the point of even blowing any of the boost off? Unless of course the pressure on the way back to your intake is greatly reduced somehow.
It doesn't seem like that solves the problem, to me. If it's one big circle of air pressure, it seems like the recirculated blown-off boost is just going through some hoses and back into the intake at the same density/pressure it was "released". What am I missing here?
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Old 12-23-2006, 04:13 PM   #71
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The air gets blown off and routed PRE-turbo. Pre-turbo air is not compressed...POST-turbo air is.

You are taking compressed air....dumping it into a non compressed system. The goal is when the throttle plates close, there is a pressure wave that will travel back through the system and can cause a "surge". You vent that wave off.....back to the air intake.
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Old 12-24-2006, 04:06 PM   #72
X-Factor
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bump...
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Old 12-27-2006, 07:31 PM   #73
+WRX+
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Quote:
Originally Posted by Unabomber View Post
Are there any negative effects with aftermarket BOVs? Yes. The downside of releasing the air to atmosphere is that it has already been metered by the mass air sensor, and when it blows off, the ECU will be injecting the wrong amount of fuel into the cylinders. The engine temporarily runs extremely rich, meaning too much fuel is injected into the cylinders.
Just to be sure....If I have the new 07' WRX sedan....Am I going to have trouble with BOV?....
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Old 12-27-2006, 09:25 PM   #74
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Even if you have the 3035 WRX, it will still cause problems.
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Old 12-27-2006, 10:34 PM   #75
JMK508
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WOW i wonder what it will look like. Anyway guys.......what is the reason everyone wants a blowoff valve. pssssssssssssssssssschaaaaaaaa. That's all it does. Sure it sounds cool for like the first 10 seconds and then it makes your car run like 1984 Geo Metro. Not good. So why does everyone feel the need to throw one on a stock car. WHY
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