BoV psi question
BoV psi question
I'm still a green head when it comes to BoVs.. so if i make any incorrect comments just let me know....
Anyway.. are there any BoV that deliver the same amount of psi into the engine and would still produce the blow off sound? I don't want to replace my engine within the first 3 or 4 years because i remember reading that if the BoV puts too much air or too little air into the engine it can damage it. (This was some car manual about turbos and engines, I was reading it in a B&N
) Anyway are there any BoV that can do this? The main reason why i want to get the BoV is just for the nice Psshh sound haha 
I don't really care about the improved performance, but I do care about my car I don't want it to die on my within a few years. Any suggesstions? Are BoV hard to install by myself? I don't really need the pssh sound to be that loud either. I just want to be able to hear it at least. I know for STI's there's a silencer I can remove to hear it a lot easier. I don't know if my Evo has anything similar near the air filter box.
Thanks in advance for any info!
Anyway.. are there any BoV that deliver the same amount of psi into the engine and would still produce the blow off sound? I don't want to replace my engine within the first 3 or 4 years because i remember reading that if the BoV puts too much air or too little air into the engine it can damage it. (This was some car manual about turbos and engines, I was reading it in a B&N
) Anyway are there any BoV that can do this? The main reason why i want to get the BoV is just for the nice Psshh sound haha I don't really care about the improved performance, but I do care about my car I don't want it to die on my within a few years. Any suggesstions? Are BoV hard to install by myself? I don't really need the pssh sound to be that loud either. I just want to be able to hear it at least. I know for STI's there's a silencer I can remove to hear it a lot easier. I don't know if my Evo has anything similar near the air filter box.Thanks in advance for any info!
first off, blow off valves are a peice of cake to install...takes prob 10 minutes. As far as the whole psi going into the engine...not sure what your getting at, but to keep your idle stable ans shifts from being lurchy, recirculate the BOV to your turbo inlet pipe (intake pipe leading to the turbo) and you will be fine and still hear the "pppshhhh" On another note, if you just bought an intake you will hear your stock diverter valve! And a bov wont hurt your engine at all...if installed properly.
P.S. if your getting a BOV just for the noise.......nevermind
P.S. if your getting a BOV just for the noise.......nevermind
Joined: Apr 2005
Posts: 9,002
Likes: 12
From: somewhere testing various tires, brakes, and suspensions.
Hey Hen, I might be able to help you out here.
A few things for you:
Valves cannot flow too much air, our cars have a metered MAF. So we have to use recir. bov v. VTA (vent to atmosphere). More on that later. But valves that are not flowing enough air back into the engine, will cause the post turbo air to possibly flow backwards to the turbo could damage the turbo fins. By stopping the turbo and spinning it backwards. This happens when there is adjustablility in the springs in the bov. Its also known as compressor surge or a psh-psh-psh sound (like the air is being chopped up.
On Evos - you will no hear the bov unless you go with a cone type intake, the stock box does a very good job of masking the sound. And a big note for you. If its just the sound you want, just change to an open style intake (but leave the intake piping stock). The stock valve sounds quite well when the intake is open.
My recommendations for an aftermarket valve would be the Tomei dv. It is a slightly modified version of the JDM MR valve and is a metal version of ours, but has a slightly stiffer spring so it holds boost better. Or the JDM MR valve. Same as Tomei, but without the added tweaking Tomei did.
And no its really easy to install. If you need some assistance look me up. Id be glad to help with the install.
A few things for you:
Valves cannot flow too much air, our cars have a metered MAF. So we have to use recir. bov v. VTA (vent to atmosphere). More on that later. But valves that are not flowing enough air back into the engine, will cause the post turbo air to possibly flow backwards to the turbo could damage the turbo fins. By stopping the turbo and spinning it backwards. This happens when there is adjustablility in the springs in the bov. Its also known as compressor surge or a psh-psh-psh sound (like the air is being chopped up.
On Evos - you will no hear the bov unless you go with a cone type intake, the stock box does a very good job of masking the sound. And a big note for you. If its just the sound you want, just change to an open style intake (but leave the intake piping stock). The stock valve sounds quite well when the intake is open.
My recommendations for an aftermarket valve would be the Tomei dv. It is a slightly modified version of the JDM MR valve and is a metal version of ours, but has a slightly stiffer spring so it holds boost better. Or the JDM MR valve. Same as Tomei, but without the added tweaking Tomei did.
And no its really easy to install. If you need some assistance look me up. Id be glad to help with the install.
Last edited by Smike; Oct 3, 2005 at 12:28 PM.
Joined: Apr 2005
Posts: 9,002
Likes: 12
From: somewhere testing various tires, brakes, and suspensions.
Yes, you can leave the bov stock.
I have the RMR intake, it takes out the intake box but keeps the stock piping. Comes with a bracket that bolts to the MAF. Then a cone filter goes on that (its a K&N filter). Works quite well, and you can hear the spool up and bov very clearly.
I have the RMR intake, it takes out the intake box but keeps the stock piping. Comes with a bracket that bolts to the MAF. Then a cone filter goes on that (its a K&N filter). Works quite well, and you can hear the spool up and bov very clearly.
If you honestly just want it for the sound, I'd just buy an APS, GFB, or Turbosmart BOV. Those are all dual port, meaning they vent a certain bit just for the sound, and also recirculate a certain bit to keep the mass air flow sensor happy.
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Originally Posted by dan628
Just leave the stock air box, its good enough....
Originally Posted by Thegame
If you honestly just want it for the sound, I'd just buy an APS, GFB, or Turbosmart BOV. Those are all dual port, meaning they vent a certain bit just for the sound, and also recirculate a certain bit to keep the mass air flow sensor happy.
SmikeEvo- How much are the intake and filters you bought? And i hope that's even easier to install than the BoV haha. Let me know I might take that route it seems a lot simpler. I'm just curious is the Stock BoV connected directly to the Intercooler then to the turbo charger or does it go through the air filter as well then to the turbo?
Also one more thing, Will the new intake cause more air to flow into the turbo charger? If so wouldn't i need to reprogram the fuel chip?
Keeping the intake open wouldn't that cause more dirt to get into my engine?? Or is the RMR intake supposed to control the opening and closing of my intake?
Anyone else have any advice on this? Thanks...
Keeping the intake open wouldn't that cause more dirt to get into my engine?? Or is the RMR intake supposed to control the opening and closing of my intake?
Anyone else have any advice on this? Thanks...
Errr... I don't have Aol...
Anyway anyone know if the RMR intake will keep my intake tube open the whole time letting dirt in, or will it open when needed and close when it's supposed to?
Anyway anyone know if the RMR intake will keep my intake tube open the whole time letting dirt in, or will it open when needed and close when it's supposed to?
Joined: Apr 2005
Posts: 9,002
Likes: 12
From: somewhere testing various tires, brakes, and suspensions.
Hey Hen, sorry I didnt get home till 11 pm last night, then I crashed.
Here is my intake:
http://www.lancershop.com/customer/p...6&cat=2&page=1
I believe Dan was saying to leave it all stock - but changing the intake piping - you will need a flash.
As long as you have the right tools (i.e. wrenches, socket wrench and metric set, and screwdrivers), its pretty easy to install.
The stock bov is located off of the upper intercooler piping. Go next to the battery, and under the aluminum intake there is a hose off of it, follow that hose to a black plastic unit with a vacumn line going to it. You will notice that goes into the intake post MAF, that is the dv (diverter valve - aka bov). BOV's are post turbo, and mounted to the intercooler piping before the air goes into the engine.
Open intake doesnt mean open to the elements. The air will still be filtered, but there is no housing surrounding the filter, so the filter is open to get as much air as it needs. No, installing an open intake will not cause your car to get too much air, the amount of air a car needs is determined by the turbo and MAF, it will induct air easier, but it wont take too much. I had my intake on months before I had a flash, it does not affect daliy driving.
The dual vent bovs are unique, but you do still need to have them set correctly or you could vent too much back to the atmosphere, which could cause rich problems and stalling.
Here is my intake:
http://www.lancershop.com/customer/p...6&cat=2&page=1
I believe Dan was saying to leave it all stock - but changing the intake piping - you will need a flash.
As long as you have the right tools (i.e. wrenches, socket wrench and metric set, and screwdrivers), its pretty easy to install.
The stock bov is located off of the upper intercooler piping. Go next to the battery, and under the aluminum intake there is a hose off of it, follow that hose to a black plastic unit with a vacumn line going to it. You will notice that goes into the intake post MAF, that is the dv (diverter valve - aka bov). BOV's are post turbo, and mounted to the intercooler piping before the air goes into the engine.
Open intake doesnt mean open to the elements. The air will still be filtered, but there is no housing surrounding the filter, so the filter is open to get as much air as it needs. No, installing an open intake will not cause your car to get too much air, the amount of air a car needs is determined by the turbo and MAF, it will induct air easier, but it wont take too much. I had my intake on months before I had a flash, it does not affect daliy driving.
The dual vent bovs are unique, but you do still need to have them set correctly or you could vent too much back to the atmosphere, which could cause rich problems and stalling.
Hmm.. so...
1. intake and filter change means i have to flash as well...
2. Just change the BoV that recirculates the same amount of air (as the stock BoV ) back to turbo?
1. intake and filter change means i have to flash as well...
2. Just change the BoV that recirculates the same amount of air (as the stock BoV ) back to turbo?
Joined: Apr 2005
Posts: 9,002
Likes: 12
From: somewhere testing various tires, brakes, and suspensions.
Intake and Filter - flash.
Filter (cone or panel type) only - no flash.
Correct - just change to a bov that flows like stock but can hold the boost better will work fine.
What do you want to get out of your bov? I needed better holding power because I run more psi and whatnot. Sound was a side benefit. If its just to hear the whoosh sound then I would change to the cone filter and leave the stock dv in. If you plan on adding a boost controller and to run more boost, or yours is leaking, then an aftermarket will correct that.
The pic is for Evolution888, sorry to put it here, but its a really ghetto mspaint job.
Filter (cone or panel type) only - no flash.
Correct - just change to a bov that flows like stock but can hold the boost better will work fine.
What do you want to get out of your bov? I needed better holding power because I run more psi and whatnot. Sound was a side benefit. If its just to hear the whoosh sound then I would change to the cone filter and leave the stock dv in. If you plan on adding a boost controller and to run more boost, or yours is leaking, then an aftermarket will correct that.
The pic is for Evolution888, sorry to put it here, but its a really ghetto mspaint job.
