TurboXS RFL BOV
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TurboXS RFL BOV
wondering if you guys can give me some insight on this. i installed it last night, first time i've heard it, sounds great! well sounds great when i shift in the higher RPM's like 6000... but when i shift lower.. 3000- and gives this whistling sound at the end of every PSSSHHH... does anyone know what that is? and what to do to get rid of it? is it leaking?
Honestly man....im not aiming to seem like a *****, but dump that thing. Many of us have had those on our cars, and all it does is mess up your A/Fbetween shifts, and leak boost. If possible try to return it to the vendor, and get a GFB Hybrid, or run the stock BOV. The sound with the RFL is cool, but not worth the side effects.
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isn't the stock one a bypass valve, meaning it routes the air back into the intake ??
In which case, a BOV (which would vent the air into the atmosphere, hence producing the cool sound you wanted) would be bad, since the computer has already figured on the air being there etc. So it would throw off you a/f mixture.
You need something though, but a lot of the confusion lies in the fact that there are two kinds, a BOV which usually just vents into the air, and a bypass, which routes the air back into the intake for you.
Its probably way more complicated than that, i'm sure someone will correct me if i'm wrong
In which case, a BOV (which would vent the air into the atmosphere, hence producing the cool sound you wanted) would be bad, since the computer has already figured on the air being there etc. So it would throw off you a/f mixture.
You need something though, but a lot of the confusion lies in the fact that there are two kinds, a BOV which usually just vents into the air, and a bypass, which routes the air back into the intake for you.
Its probably way more complicated than that, i'm sure someone will correct me if i'm wrong
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Joined: Feb 2003
Posts: 30
From: Buffalo NY :(
Car Info: 2003 Subaru Impreza WRX
All that I know about BOVs I have leaned today in the last 10 minutes of reading these forums One very knowledgable gentleman in a previous thread broke down the advantages of a aftermarket BOV as well as the drawbacks. Here is the way I see it so far:
factory BOV - recirculated air back into the manifold, hence the air flow read by the MAF is indeed correct (obviously)
aftermarket BOV (atmospheric) - vents boost pressure upon shifting your vehicle into the atmosphere. Pressure "spikes" occur since your turbo achieves max boost and rides along that line after about 3500 rmps. When you shift, the throttle body all but closes, and hence the pressure increases dramatically in the intake setup. A BOV vents this pressure inmmediately, reducing the stress on the turbo. Drawback? If the excess air is vented into the atmosphere, some air is lost, and hence th air flow read by the MAF differs from the actual amount of air (less then your comp thinks), hence you will momentarily run RICH (whats new? Its a subaru...). This is NOT damaging to the engine, since rich run conditions simply choke out the engine and reduce the power, but do NOT increase the temperaure too much. Wheh.
Ok, so why aftermarket BOV then?
1) sounds neat. Everyone hypes the GFB stealth FX to my knowledge, because apparantly you can adjust the sound it makes!
2) maybe, your turbo will spool up a lil quicker (debatable) and maybe you will preserve turbo life due to pressure spikes, however I find it hard to believe that Subaru would design a factory BOV that would actually ruin the stock turbo.
One last note - there are 50/50 BOVs available that vent half the air back into the manifold and half into the atmosphere, which is the middle of the road approach.
Hope this saves you all time reading up
good luck!
One very knowledgable gentleman in a previous thread broke down the advantages of a aftermarket BOV as well as the drawbacks. Here is the way I see it so far:factory BOV - recirculated air back into the manifold, hence the air flow read by the MAF is indeed correct (obviously)
aftermarket BOV (atmospheric) - vents boost pressure upon shifting your vehicle into the atmosphere. Pressure "spikes" occur since your turbo achieves max boost and rides along that line after about 3500 rmps. When you shift, the throttle body all but closes, and hence the pressure increases dramatically in the intake setup. A BOV vents this pressure inmmediately, reducing the stress on the turbo. Drawback? If the excess air is vented into the atmosphere, some air is lost, and hence th air flow read by the MAF differs from the actual amount of air (less then your comp thinks), hence you will momentarily run RICH (whats new? Its a subaru...). This is NOT damaging to the engine, since rich run conditions simply choke out the engine and reduce the power, but do NOT increase the temperaure too much. Wheh.
Ok, so why aftermarket BOV then?
1) sounds neat. Everyone hypes the GFB stealth FX to my knowledge, because apparantly you can adjust the sound it makes!
2) maybe, your turbo will spool up a lil quicker (debatable) and maybe you will preserve turbo life due to pressure spikes, however I find it hard to believe that Subaru would design a factory BOV that would actually ruin the stock turbo.
One last note - there are 50/50 BOVs available that vent half the air back into the manifold and half into the atmosphere, which is the middle of the road approach.
Hope this saves you all time reading up
good luck!
Originally posted by phucvtec
1) sounds neat. Everyone hypes the GFB stealth FX to my knowledge, because apparantly you can adjust the sound it makes!
1) sounds neat. Everyone hypes the GFB stealth FX to my knowledge, because apparantly you can adjust the sound it makes!
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