Last ngiht I was playing with the adjusting screw on my Blitz bov, nothing changed except the sound of my turbo spooling. It sounds like a dremmel or something. Theres only about 7psi. I put the bolt to where it originally was and still sounds like I have some dremmel in there. Im running full non-seq twins.

 

Did you tighten her waaaaay down to try and get a crazy noise? If you did you probably thrashed your turbos. The more noise the BOV makes the more damage its doing to your turbos. The stock BOV doesnt make a sound because it just lets the air out. The fancy BOV's create air pressure differences and thus sound by restricting air flow. Restricting the air flow out means your turbos are pushing air into the now sealed area after your turbos and before your throttle body. When they cant squreeze any more air in there they stop and bounce back and break things.

 

The LESS noise your BOV makes the more damage its doing to your turbo.....because now it would be blowing off through your turbos...if u tighting screw to much on BOV...

 

Shut up noobie youre wrong.

Why: The BOV is after the compressor and before the throttle body ok? The turbos have this momentum going and when you let off the gas the BOV opens to let all that momentum keep pushing air out of the BOV. If you tighten it it makes the air work harder to get out and makes it louder. If its hard for the air to get out it builds up in the space between the compressor wheel and the throttle body. When it builds up too much it makes the turbos backspin. Now if you dont tighten it and its not making noise its not restricting the air. If the air is free to leave the turbos can keep spinning and not snap in half. But when youre making all that noise from your BOV its due to intense air pressure over a needle(like a reed on an instrument). The harder you blow the louder it is. I speak of this pressure and volume when that may not be the case it may in fact be the pitch. Ok so if you tighten it all the way down and its really loud and really pitchy youre breaking your turbos. Go post about 1000 more times and then you can tell me im wrong. Ive been sitting on this forum for 4 years reading about crap like this. DO NOT TIGHTEN YOUR BOV TO THE MAX YOU WILL BEAK YOUR TURBO.

 

ok inlightin me... smarty ...when ever u tighting the screw on your BOV it makes LESS noise....which cause's your motor to build up back pressure...an have no other choice but to push air back through turbo's ...

 

you're*

be nice to the noobs

 

Im sorry its just that I wasnt lying or talking out of my *** and I worked hard to explain this in my first post which he obviously didnt take the time to read.

 

The stock BOV doesn't make a noise because its in the box where the filter is and you just can't hear it, because it muffles the sound so much. If you unhook the hose to the box it will make noise, maybe not as loud as you want but you can hear it.

 

Thats pretty much what I meant. It makes no sound relative to aftermarket BOV's.

 

not because i have less post than u makes me a newbe at what i'm talkin about....
its impossible for u to tightn a blow off valve an more air comes out of it.... so what happend when u losen up the screw....lol... this gotta be the most stupidest thing i ever heard...

 

he said he have a blitz blow off valve...aftermarket...

 

lol ....u are funny.....

 

ok back to the original post. how old are your turbos? they could have too much play back and forth in the compressors. was it runnign 7 psi before??

 

OK im sending you on a science experiment. Go get a plastic bottle. Blow into it. Thats right no air gets out. Now go cut a tiny hole in the bottle and blow through it. It suck doesnt it? That is the condition creating a loud BOV. Now cut a huge hole in the bottle and blow through it. Real easy right? This is the condition that creates less noise. Your mouth is the compressor of the turbo. The other end of the bottle is the closed throttle body. The hole is the BOV. Do you get it yet?

 

ok take off your blow off valve on your car then tell me where will the air go... the loud noise u are hearin is from your turbo's not BOV...

 

NOooooooooooooo. BOV's make the chirp noise.

 

Listen this happend to me b4 an i blew my turbo thats why i puttin in my 2 cents....
i got a type-R BOV i tighten the screw basically almost all the way down ...an the air came through the turbo not the BOV.....i also didn't have stock turbo's i have a t-78 kit....i stood in front the car rev it up with BOV tighten just about all the way down. an it blew off from turbo... when i losen it up ..then it blew off from BOV....

 

I'm just going by what i experienced....with my car ...

 

Air coming through your turbo is exactly what breaks turbos. The air came out of your turbo because your BOV was all the way closed and the air had nowhere else to run to. When you loosened your BOV the BOV did what it was supposed to do. Vent air. BOV's make noise when they vent air. So youre right a fully tightened BOV would not make any noise. It would eat your turbo. A highly tightened(but not closed) BOV would make the most noise possible and also.....you got it! EAT YOUR TURBOS! Its called backspin or bounce. Its when the air pressure is so high that the metal turbo blades actually bounce off the air and then spin backwards to release the pressure built up in front of the turbo. Its a bad thing. They go from spinning full speed in one direction to full speed in reverse in about .0000000000001 seconds. Now metal is real strong but when things are spinning at sat 125,000 rpms and then go to -125,000rpms(a change of 250,000rpms) in the blink of an eye it snaps the turbo shaft in half instantly.

 

yeah i broke my turbos but it was cause i was driving and it ran out of oil. and one of the turbos shaft *propeller thingy not sure if shaft is the right word* got stuck and it kinda sounded like a dremel. so you might my friend have broken turbos.

 

THATS exactly what happend to me.....my turbo wasn't holdin boost so i taught it was the BOV lettin air out because screw WASN'T tighten.......so i tighten it up ..BOOM ...turbo blew...thats after a good couple of runs tho....lol...then i realize it wasn't me BOV it was my wastegate spring .......

 

Does it really stop it that fast? How do you know this?
I'm interested, I didn't know it was that detremental.

 

Compressor Surge...wheeee!

 

I just spat out a bunch of zeros. It stops really fast. Fast enough to snap the shaft. Thats in a closed BOV situation. Were it to be slightly open it would place great stress on the shaft but perhaps not enough to break it. The basic idea is that any avoidable stress on parts should be a voided. Ive read some posts about how this breaks turbos and what not. The problem is that all forces on the turbo cease at closed throttle. Nothing is pushing it from behind and then with no escape of air the laws of physics say the pressure is going to equal out and that air is coming back. The more rpms in the turbo the more boost is gonne be locked up in front of it and when it cant push anymore it starts to give and unfortunately the laws of physics are pretty instantaneous. The turbo wheels and shaft are lightweight but have huge momentum at those rpms. Unfortunately not enough momentum to combat the mighty air pressure. So when all that momentum gets tossed back so instantly and to the opposite intertia its breaking time. More often that not its not a static force that will break something but a rapid change in forces. Bouncing a hammer off of something will do twice as much damage as hitting something with a hammer.

 

Actually the screw your tightening up increases the spring pressure against the piston that the vacuum pulls against, it doesn't close up the oriface it just requies more vacuum to open it and closes the port quicker as the spring pressure over comes the vacuum, this is what gives you a sharper (louderblast of air) screw turned in as opposed to a softer longer discharge (screw out) aftermarket BOV manufacturers have other gimmicks such as heavier springs and port inserts to achieve the sound and boost pressure needs of the buyer.