FoxHound Posted April 20, 2007 Share Posted April 20, 2007 i read that a BOV was not good for some cars.. can the legacy use an aftermarket BOV? i know it really doesnt do much, but i love the noise Link to comment Share on other sites More sharing options...
rao Posted April 20, 2007 Share Posted April 20, 2007 Go with a 50/50 recirc model and enjoy the noise Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
FoxHound Posted April 20, 2007 Author Share Posted April 20, 2007 what is a 50/50 recirc ?? Link to comment Share on other sites More sharing options...
rao Posted April 20, 2007 Share Posted April 20, 2007 It recirculates 50% of the flow and lets 50% out for the sound. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Mark34 Posted April 20, 2007 Share Posted April 20, 2007 The blowoff valve does do a crucial fucntion, it relives boost pressure while mostly in downshifts to allow your change in airflow over the turbo which could create a chocked flow on the turbo to surge. Basically you need one so you don't damage your turbo. I don't know why you would want a 50 /50, unless you want the sound. The recirculated should reuse the air in the line and helps spool the turbo faster. Perrin makes a nice recirculation BOV. http://www.perrinperformance.com/products/show/250/Blow-Off-Valve-Recirc-SS?category=37&model=10 Link to comment Share on other sites More sharing options...
rao Posted April 20, 2007 Share Posted April 20, 2007 He only wants the sound. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
lvethesnow Posted April 20, 2007 Share Posted April 20, 2007 the "search" button is your best friend..........................had to say it:icon_mrgr History does not entrust the care of freedom to the weak or timid People sleep peacefully at night cause rough men stand ready to do violence on there behalf Link to comment Share on other sites More sharing options...
FoxHound Posted April 20, 2007 Author Share Posted April 20, 2007 i am new to the turbo game, i thought the BOV just gave you the noise. i was unaware of any benefits it had for the car. If a BOV helps with performance or some other aspect of the car, i would rather go with the BOV Link to comment Share on other sites More sharing options...
rao Posted April 20, 2007 Share Posted April 20, 2007 It has NO BENEFIT over the stock piece. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
FoxHound Posted April 20, 2007 Author Share Posted April 20, 2007 that what i thought... that perrin one sounds pretty good, unles you know of a better one Link to comment Share on other sites More sharing options...
Adamaxus Posted April 20, 2007 Share Posted April 20, 2007 It has NO BENEFIT over the stock piece. isn't it worse? it relives the pressure which causes some sensor stuff and causes you to run lean for a little? Link to comment Share on other sites More sharing options...
Mark34 Posted April 23, 2007 Share Posted April 23, 2007 Supposedly that Perrin one can be "tuned" to help with the idle and air/flow. But you're right, an aftermarket BOV can cause your engine to run lean. Personally, I would rather leave it quiet so no one knows what you've got going on under the hood. Link to comment Share on other sites More sharing options...
mfg Posted April 23, 2007 Share Posted April 23, 2007 will the hks ssqv bov do damage 2 our cars? Link to comment Share on other sites More sharing options...
Bigkahuna808 Posted April 23, 2007 Share Posted April 23, 2007 on full vent it can, go full recirc since HKS has a kit for that now. The recomened BOV that people are using on the LGT is the GFB (Good Fast Bits) its a hybrid it can go full recirc, 50/50, and full vent. Im going to get one and run it at either full or 50/50 Link to comment Share on other sites More sharing options...
underpowerd Posted April 23, 2007 Share Posted April 23, 2007 Can't verify firsthand, but I have read of stock bpv's being suspected of leaking under higher psi. Link to comment Share on other sites More sharing options...
06White2.5I Posted April 23, 2007 Share Posted April 23, 2007 Term usage: "Blow off valves" go by several names, among them are compressor bypass valve (CBV), air by-pass valve, bypass valve (BPV), blow off valve (BOV), Diverter valve, and possibly a few others. BOV is the common and incorrect term that lumps true blow off valves and bypass valves under the same term. For the sake of correctness, this post will refer to either aftermarket BOV, aftermarket BPV or OEM BPV as these are the most correct terms. What is the function of a blow off valve (BOV)? To release pressure from the intake tract of a turbo car when the throttle closes. It is a vacuum-actuated valve designed to releases the air to the atmosphere. What is the function of a bypass valve (BPV)? To release pressure from the intake tract of a turbo car when the throttle closes. It is a vacuum-actuated valve designed to recirculate the air back into the intake before the turbo inlet, but after the airflow sensor. What is the purpose of a BOV/BPV? When the throttle closes and the intake system is under pressure, the high-pressure air entering the motor will bump into the closed throttle plate, and in the absence of a BOV/BPV, a pressure wave will travel back to the turbocharger. The result is that the compressor wheel will stall (a phenomenon known as “compressor surge”) and slow down very quickly. This is hard on the bearings and decreases the turbo’s lifespan, but it also means the turbo will take longer to spin up the next time the throttle is opened. Are aftermarket BOVs necessary with Subaru turbos? No. The OEM BPV is perfectly fine up to 20psi of boost. For applications using higher boost levels, an aftermarket BOV/BPV should be considered. What are the different types of aftermarket BOVs/BPVs? Different manufacturers use different methods. There are three basic types: 1. Aftermarket BPV: Similar in function to the OEM BPV where 100% of the air is recirculated. 2. Atmospheric BOV: 100% of the air is vented to the atmosphere. 3. Hybrid BOV: These depend on the manufacturer and end user settings. These can either be adjustable or manufacturer set for different percentages of atmospheric/recirculation dumping. They can also be set to work as recirculation during lower boost conditions and 100% atmospheric during higher boost conditions. Are there any downsides to aftermarket BOVs? There have not been significant amounts of problems with BOVs. Aftermarket BOVs can and do require some light end user maintenance to keep them performing perfectly. For aftermarket hybrid BOVs that have end user defined settings, there will be an initial period of adjustment to obtain the desired recirculation/atmospheric ratio. As well, most aftermarket BOVs will require "tuning" (usually via supplied washers, a screw, or other mechanism on the BOV itself) to allow them to idle correctly and blow off at the right time. 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. This temporary rich condition isn’t usually that harmful, but it can cause bucking or hesitation on lift-throttle. If the condition is really bad, it can eventually foul spark plugs and even clog the catalytic converter as unburned fuel on the catalytic converter burns very hot, and too much of it can melt the cat. Can my tuner or engine management tune out this rich period? No. Credit to Unabomber over on NASIOC. Have Camera...Will Travel ~2007 LegacyGT.com Calendar (October)~ Link to comment Share on other sites More sharing options...
Bigkahuna808 Posted April 23, 2007 Share Posted April 23, 2007 so much usefully info!!! Link to comment Share on other sites More sharing options...
lawl Posted April 23, 2007 Share Posted April 23, 2007 Can my tuner or engine management tune out this rich period? No. Credit to Unabomber over on NASIOC. Damn. car for sale. PM me! Link to comment Share on other sites More sharing options...
Infamous1 Posted April 23, 2007 Share Posted April 23, 2007 Supposedly that Perrin one can be "tuned" to help with the idle and air/flow. But you're right, an aftermarket BOV can cause your engine to run lean. Personally, I would rather leave it quiet so no one knows what you've got going on under the hood. It can cause it to run rich not lean. Link to comment Share on other sites More sharing options...
AWDxBOOST Posted April 23, 2007 Share Posted April 23, 2007 i dont understand why everyone is so worried about a damn bov...ive been runnin a txs rfl @ full vent for months no... no problems at all Link to comment Share on other sites More sharing options...
Infamous1 Posted April 23, 2007 Share Posted April 23, 2007 ^^^ Except the backfires... Link to comment Share on other sites More sharing options...
AWDxBOOST Posted April 24, 2007 Share Posted April 24, 2007 i <3 backfires Link to comment Share on other sites More sharing options...
FoxHound Posted April 24, 2007 Author Share Posted April 24, 2007 Man than is a lot of info to take in... you did forget to mention they cost about $250 for really just a cool noise, but that doesnt mean i dont want one Link to comment Share on other sites More sharing options...
imstillatwork Posted April 25, 2007 Share Posted April 25, 2007 i dont understand why everyone is so worried about a damn bov...ive been runnin a txs rfl @ full vent for months no... no problems at all An you're monitoring your A/F ratios? There ya go. Link to comment Share on other sites More sharing options...
moviemadness Posted April 25, 2007 Share Posted April 25, 2007 quick question.. Although I have the stock BOV/BPV or whatever, if you let of the throttle after hard acceleration, you do hear a slight sound. Doesn't this mean that it's venting to the atmosphere? Or is that the sound of recirculation? If it is the sound of recirculation, then wouldn't you be able to hear aftermarket BOVs when you 100% recirculate?? Link to comment Share on other sites More sharing options...
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