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Old 08-02-2011, 05:52 PM   #51
aTriz
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PhatBotti e85 Tuned

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Quote:
Originally Posted by Phatron View Post
lol....you guys need to learn how the system works then its easy to understand.

by-pass valve - does exactly what the name suggests. when you let off the gas and the throttle closes, the BPV opens to BY-PASS the turbo and send the air back to the intake

blow off valve - Blows off air to atmosphere at throttle lift. bad for MAF based vehicle since you are releasing air measured by the MAF...this makes the car run rich and blow fireballs when shifting.

In both cases when you lift of the throttle the pressurized air now takes the path of least resistance.....if you put a 30 psi spring in your bpv and you're running 20psi and you let off the throttle....the spring is going to be too tight to open so the air has to go somewhere....which is back through the compressor backwards. Thats compressor surge. You're shoving air through the compressor backwards.

BPV's and BOV's dont do anything at WOT...unless they are leaking. Their main functions (preventing compressor surge and utilizing the pressurized air to keep the turbo spooled while shifting) happen when you let off the gas.

The stiffer spring/shim combo you put in...the less and less the bpv will open. So if you get to a point where the bpv isnt opening enough, then you will get compressor surge.
Gotcha, Thanks for clearing it up!
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Old 08-04-2011, 02:58 PM   #52
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installing this with my perrin downpipe and tmic this weekend then stage 2 tune on monday.

Hopefully install goes well!
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Old 08-04-2011, 08:06 PM   #53
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oh it will, its a winner
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Old 08-05-2011, 08:28 AM   #54
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installing this with my perrin downpipe and tmic this weekend then stage 2 tune on monday.

Hopefully install goes well!
it will literally take you 3-4 minutes, Just re-use your o-ring and put it in (Mine came with a blue spring, you will prob have to switch to the yellow, depending on how much boost your running)
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Old 08-05-2011, 09:44 AM   #55
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oh it will, its a winner
I bought both from you as a matter of fact lol

EXCELLENT Service!
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Old 11-05-2011, 08:19 PM   #56
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Hate to rehash an old thread but I'm looking at getting a Forge BPV with my Process West TMIC. Does anyone have a vid of the sound when shifting? I'm curious how it would sound. Thanks!
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Old 12-15-2011, 10:03 PM   #57
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Default Forge Bypass Valve

Hey everyone. I'm running a tial BOV on an aps dr525 fm. I'd like to make the conversion back to a bpv and figure forge is my best bet. My question: would I have to custom fab the flange to attach it to the fmic piping? There's the male flange off the piping now that fits into the bov, where the tial seals around it. Would I end up shaving that off and basically bolting this on there? Thanks.
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Old 12-16-2011, 08:24 AM   #58
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if you have the stock style flange, you will not have to make your own sir
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Old 01-03-2012, 05:02 PM   #59
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Installed the Yellow Spring in my Forge BPV there is a lot less of the *tink* sound now but it still happens. I cleaned off the old grease which was dirty and not pink. I used some moly/granite engine lube on the pieces. Still odd that a WRX stock Boost gauge seems to only read about 1 bar when I'm at full boost.
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Old 03-04-2012, 07:38 AM   #60
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Installed my Forge BPV a few weeks ago and noticed a drop in mpg. On the highway I use to get about 28mpg with the stock bpv, on the same stage 2 tune with the Forge bpv I can only get about 23mpg. City I can only get 19mpg with the Forge bpv. With the stock one I could get around 25.

I'm at 19PSI and running the yellow spring. It's weird because as soon as I throw the stock bpv back on my mpg goes right back up :\

Anyone else have this issue? I emailed torquedperformance and he said the map I was running shouldn't have to relearn a bpv... maybe it's the way I'm driving?
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Old 03-04-2012, 12:18 PM   #61
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The valve is leaking and you're running rich, simple as that
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Old 03-04-2012, 05:58 PM   #62
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The valve is leaking and you're running rich, simple as that
I know for a fact that my stock bpv was leaking. In fifth gear when I'm giving it gas I hear this fluttering sound coming from the bpv that sounds like air is leaking. I don't hear this sound from by forge bpv at all though so I'm not sure if it is leaking. I also replaced the oem bpv gasket seal just in case when I installed the forge.

Could installing an aftermarket bpv cause your car to run rich? I emailed torquedperformance and he said the only explanation was that I was giving it more gas causing my car to go into boost earlier, thus making my gas mileage suffer.

That part doesn't make sense because when I'm driving highway my car isn't in boost and my mileage still suffers :\
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Old 03-04-2012, 06:45 PM   #63
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it could have been leaking before, could be now. anything is possible
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Old 03-04-2012, 08:36 PM   #64
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ive been running the forge BPV on my stage 2 02 wrx for a while now. i love it. im only on 17 psi but im running the red spring with no shims. i bought it used and the seller only included the red spring and 2 shims but i obviously dont need the shims. i dont have any compressor surge at WOT but some from low speed in 5th gear when i floor it. im talking about 40 mph in 5th and floor it till it hits about 2psi then let off. with that being said, i dont care because its a td04 anyway.

i have a SRI along with the forge BPV and i love the sound. i get compliments on it all the time. people ask me what BOV im running because they have never heard one like mine before. plus i love how it retains a stock look in a way.
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Old 03-04-2012, 08:43 PM   #65
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yup, i really wish bpv/bov companies wouldnt put pressure ratings on their springs....you just run the highest spring/shim combo that doesnt give you surge.

if you run the small pressure springs the valves crack open under a bunch of different situations and cause idling and fueling issues
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Old 03-07-2012, 10:11 PM   #66
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Quote:
Originally Posted by Phatron View Post
yup, i really wish bpv/bov companies wouldnt put pressure ratings on their springs....you just run the highest spring/shim combo that doesnt give you surge.

if you run the small pressure springs the valves crack open under a bunch of different situations and cause idling and fueling issues
exactly... its really all about trial and error... start off small and work your way up until you hit a point that tells you to stop, i.e. compressor surge in this case, and then you back off a little
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Old 03-31-2012, 09:46 PM   #67
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Quote:
Originally Posted by renegadeSTi View Post
Still odd that a WRX stock Boost gauge seems to only read about 1 bar when I'm at full boost.
1 bar = 14.5 PSI, isn't that right for stock? Or are you modified?

I have an AEM CAI. I installed a Forge BPV a few weeks ago and it is noticeably louder than the stock BPV. I can even hear it when I let up on the gas (I didn't with the stock BPV). I'm maxing out at 18 PSI, and using the yellow spring and 2 shims. Sounds like I should try the red spring.
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Old 04-03-2012, 08:21 PM   #68
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I just installed the forge bpv (cobb stage 2 with cobb short ram around 18psi) and it sounds good to me. Currently running the yellow spring with one shim. I dont think it sounds louder than the stock bpv but more of a clear bov sound .I dont hear the tink/ding sound like some of the videos i've seen, but those weren't 2011 wrx either. Maybe i'll try just the blue spring. Anyone else with a 2011 stage 2 wrx with cobb sri that can verify if their car does the ding/tink sound? Thanks.
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Old 08-25-2012, 11:35 AM   #69
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Tallking about sound? Try running it with 3" alu turbo inlet.
Louder than BOV For me it's a downside but there's really nothing I can do.
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Old 08-25-2012, 12:11 PM   #70
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its a great bpv whether its 02-07 or 08+...
serves a great function
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Old 09-30-2012, 10:19 AM   #71
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What lube should we use to relube the Forge BPV?
And where do you get it?
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Old 10-02-2012, 06:58 AM   #72
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Mobil 1 Synthetic Grease. Any car parts store.
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Old 10-02-2012, 11:36 AM   #73
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Thanks!
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Old 09-18-2013, 09:58 PM   #74
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sorry to revive this topic. I have a 2011 wrx stage 2 with 19 -20 psi .. which spring should I use? yellow? which is the shim? I hope you can help me since I am from Chile.
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Old 09-18-2013, 10:47 PM   #75
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sorry to revive this topic. I have a 2011 wrx stage 2 with 19 -20 psi .. which spring should I use? yellow? which is the shim? I hope you can help me since I am from Chile.
Yellow spring, no shims. Enjoy!

Damn, I haven't been on here for a while. Lol.
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