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Old 04-20-2011, 09:23 PM   #21
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Quote:
Originally Posted by nitrodann View Post
you dont need one though. At all. It helps with boost response on gear changes, at low boost thats all.

Dann
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Originally Posted by MartinezA92
-Not running a BOV is not an option.
This.

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Originally Posted by wbeers690 View Post
i feel like i have seen one that was set up as if it would recirculate but had a filter on the end of the tube.. is there any way to attach pipe to the bov and route it to a filter.. i feel like this would cut down on the sound
If I understand you correctly, this is what someone already said. I'm going to try it in this configuration, and also with it recirculating.
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Old 04-21-2011, 01:25 AM   #22
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alright guise.

Is this what I'm looking for? I've seen this mentioned on this forum and just want to confirm.
http://www.034motorsport.com/turboch...n-p-18712.html
I looked on ATP turbo and didn't find anything, so I googled Bosch recirc BOV "710 N", and stumbled on that.
Also read **** about them leaking. I'm going to go out on a limb here and say I won't be seeing anything above 15 psi for a long time.
Opinions/comments/suggestions etc. appreciated.

Last edited by MartinezA92; 04-21-2011 at 01:38 AM.
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Old 04-21-2011, 01:46 AM   #23
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Quote:
Originally Posted by MartinezA92 View Post
alright guise.

Is this what I'm looking for? I've seen this mentioned on this forum and just want to confirm.
http://www.034motorsport.com/turboch...n-p-18712.html
I looked on ATP turbo and didn't find anything, so I googled Bosch recirc BOV "710 N", and stumbled on that.
Also read **** about them leaking. I'm going to go out on a limb here and say I won't be seeing anything above 15 psi for a long time.
Opinions/comments/suggestions etc. appreciated.
I actually have one of the ones Begi sell in my forsale thread Here. If you are interested shoot me a pm and we can work something out.
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Old 04-21-2011, 02:17 AM   #24
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How do you figure it's not? The only difference is the pipe that routes back before the turbo, aside from those that have eleventy small holes instead of one large one.
Correction, the only difference YOU see is the pipe that routes back before the turbo and the eleventy small holes instead of the one large one.

I "figure" because i've researched bovs plus manufacturing is my nature/job/career so i know how to read the blue prints and make heads/tails of whats on there.

Recirculating ones are very simple. Its just 1 piston that opens when in vacuum. You dont really care that its open as the pipe goes to the turbo so either way there is a filter keeping it a clean loop. If you remove the pipe and put a "horn" on the recirculating valve now when vacuum is present the valve is open however its now open to the atmosphere so unless there is a filter on the other end crap can enter through the valve. Vent to atmosphere on the other hand are made to.. well vent to atmosphere. They solve the issue by putting a second piston in that stays closed unless forced open by pressure build up after releasing the gas.
The important part here is that the one piston behaves exactly like the piston in the recirculating valve. Its always open when in vac however the 2nd piston stays closed so unfiltered air cannot enter through the BOV.
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Old 04-21-2011, 02:32 AM   #25
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Originally Posted by triple88a View Post


Have you even seen a diagram of a bov?

After reading more of your post you seem to have some reading to do about turbo life.
Thankyou for explaining single vs double piston. I am quite new to turbo gear. that explains why you sometimes I hear not to run bypass as vta. I thought all of them were double piston.

Sorry.

Dann
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Old 04-21-2011, 02:35 AM   #26
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Can someone point out the whistle tip from this page?

http://www.mazdas247.com/forum/showt...lean-HKS-SSQV&
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Old 04-21-2011, 03:55 AM   #27
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The three "fins" in the opening.

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Originally Posted by shuiend View Post
I actually have one of the ones Begi sell in my forsale thread Here. If you are interested shoot me a pm and we can work something out.
I was gonna suggest finding somebody selling a used one with the crossover pipe and supporting charge pipes... looks like shuiend has exactly whatcha need. Recirc is definitely going to be more expensive though, gotta have cold side charge pipe and intake pipe able attach to the recirc pipe. Recirc would be quieter but you may be able to get away with a vent to atmosphere if you find a way to muffle the sound. Maybe like the hks with the fins out and something over the port. Sock or sponge comes to mind but theres gotta be a better solution.
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Old 04-21-2011, 04:03 AM   #28
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Darn, I thought it was something internal. I have this BOV:

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Old 04-21-2011, 04:38 AM   #29
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surprised you had room for a bov in that engine bay lol, looks tight
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Old 04-21-2011, 03:32 PM   #30
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Originally Posted by triple88a View Post
Recirculating ones MOST BOVsare very simple. Its just 1 piston that opens when in vacuum pressure*'vacuum side valve area' is greater than combined 'spring rate'*preload and boost*'pressure side valve area' force. Which causes you to choose between response and the ability to stay closed at idle. You dont really care that its open as the pipe goes to the turbo so either way there is a filter keeping it a clean loop because the majority of people on here use a speed density type EMS, instead of a MAF type. If you remove the pipe and put a "horn" on the recirculating valve now when vacuum isthe above conditions are present the valve is open however its now open to the atmosphere so unless there is a filter on the other end crap can enter through the valve. So select an appropriate spring rate


I have never seen such a blow off valve as below, unless you're talking about a synchronic with the anti-stall valve, which is basically a check valve. What you may be talking about is a pull type blowoff valve, which don't operate the way you try to explain it. They still only have one piston. The thought is that the boost pressure pushes against the valve to hold it closed for more mad tyte boosts before it leaks, realistically it's just the same as a push type valve plumbed backwards, it hooks to the charge piping on the exhaust side, and exhausts on the boost side.

If you have links to drawings, cut aways, etc. of what you describe as a VTA bov, I'll happily eat crow.


Vent to atmosphere on the other hand are made to.. well vent to atmosphere. They solve the issue by putting a second piston in that stays closed unless forced open by pressure build up after releasing the gas.
The important part here is that the one piston behaves exactly like the piston in the recirculating valve. Its always open when in vac however the 2nd piston stays closed so unfiltered air cannot enter through the BOV.
Don't presume my background.
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Old 04-21-2011, 04:17 PM   #31
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I have one called the "RFL"- which stands for Really ******* Low-key...it's quiet...try it.
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Old 04-21-2011, 06:18 PM   #32
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I have one called the "RFL"- which stands for Really ******* Low-key...it's quiet...try it.
hahaha
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Old 04-21-2011, 08:22 PM   #33
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Don't presume my background.
LoL and i can take what you say, completely change the wording to completely change the meaning of your sentence and make it sound like you're a complete ******* moron. Stop reading between the lines and do some research on your own dude. Let me get you started. http://tinyurl.com/3s8vlrk

As far as you not knowing the VTA dual piston valves... I just opened my damn valve TODAY stop rewording my sentences just because you have no idea wtf i'm talking about .
/flame off

Alrighty getting back on topic... the reason why my valve was so quiet is because the 2nd spring was simply too tight so unless i spooled that turbo good, there simply was not enough pressure to open the 2nd piston. Today i took that spring out and replaced it with a softer spring that has just enough force to hold it closed until the turbo starts compressing. At that point i have slight leak which goes away after main valve shuts closed at about 15inhg and up.

Now i can hear it ...kinda whistly though.
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Old 04-21-2011, 09:28 PM   #34
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Originally Posted by Doppelgänger View Post
I have one called the "RFL"- which stands for Really ******* Low-key...it's quiet...try it.
Ok, I'll give it a try.
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Old 04-21-2011, 09:30 PM   #35
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I was gonna suggest finding somebody selling a used one with the crossover pipe and supporting charge pipes... looks like shuiend has exactly whatcha need. Recirc is definitely going to be more expensive though, gotta have cold side charge pipe and intake pipe able attach to the recirc pipe. Recirc would be quieter but you may be able to get away with a vent to atmosphere if you find a way to muffle the sound. Maybe like the hks with the fins out and something over the port. Sock or sponge comes to mind but theres gotta be a better solution.
Someone on this forum used foam or something like that. I'm not liking the crossover pipe having to go across the engine bay like that. Now I'm not sure what I'll do...Maybe just let the recirc BOV vent to atmosphere.
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Old 04-21-2011, 10:41 PM   #36
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Originally Posted by MartinezA92 View Post
Someone on this forum used foam or something like that. I'm not liking the crossover pipe having to go across the engine bay like that. Now I'm not sure what I'll do...Maybe just let the recirc BOV vent to atmosphere.
I don't think your quite understanding the concept here. A recirculating blow off valve venting to atmosphere is just a blow off valve. Same way a bov venting back into the intake pipe is a recirculating bov. There is no difference between a recirc bov and a normal bov besides where the blown off air goes.

A vent to atmosphere blow off valve takes the pressurized air in the charge pipe and releases it into the atmosphere.

A recirculating blow off valve takes the pressurized air from the charge piping and releases it the same way as a vta, but instead of into the open air, it releases it down a pipe back into the intake pipe downstream from the maf/afm, that way all the air in the system is measured.
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Old 04-21-2011, 10:41 PM   #37
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oh also, found this



edit: how the **** do you embed youtube videos? that **** never works for me?
link
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Old 04-21-2011, 10:48 PM   #38
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No, I get that, but I remember reading that the Bosch recirc BOV is still pretty quiet when its in VTA configuration.
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Old 04-21-2011, 10:55 PM   #39
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Originally Posted by MartinezA92 View Post
No, I get that, but I remember reading that the Bosch recirc BOV is still pretty quiet when its in VTA configuration.
I see what you mean then, just use the bosch as a regular bov. Also on the hks you can adjust the bov, looser you make it the less pressure it takes to release the air. tighten it up and the more pressure it requires. If you have it tightened up and it took say 5psi before it would vent you just wouldn't have to worry about it going off at all, and if your boosting over 5psi your blow off valve isn't going to be what gives you away.
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Old 04-22-2011, 12:49 AM   #40
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Quote:
Originally Posted by triple88a View Post
LoL and i can take what you say, completely change the wording to completely change the meaning of your sentence and make it sound like you're a complete ******* moron. Stop reading between the lines and do some research on your own dude. Let me get you started. http://tinyurl.com/3s8vlrk

As far as you not knowing the VTA dual piston valves... I just opened my damn valve TODAY stop rewording my sentences just because you have no idea wtf i'm talking about .
/flame off
For the record, It's called a correction. IE you're wrong or more information should be added. I'd rather not have some jackwagon reading your post and thinking that Atmospheric and recirculating valves are fundamentally different. They're not.
What you're talking about is an add-on that compensates for too little spring mixed with a little hype. I have done the research, designed, and built my own valve based off the cheapest of cheap ebay valves. What that fancy widget does can be accomplished by adjusting spring preload or spring rate so that the valve isn't open at idle.

You're the one that got all huffy, twice, when asked to clarify what you're saying, so I did it for you. Try deep breaths and not assuming everyone's out to get you.


On topic, The ebay RFL I had wasn't all that loud when the trumpet is removed and a straight fitting was used. They're just sprung really softly so they're open at idle and blow off every time you think about lifting the throttle
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