BOV Fluttering?
 

Is this fluttering? This is all under vacuum and not on boost. It spent a good 15 minutes getting warmed up.


http://www.youtube.com/watch?v=LW3H3XH2I2A&hd=1

Car is not tuned yet, I just started it up because it hasn't been started during these cold winter nights. When I was putting the 2g mas+intake in, the turbo had EXTREMELY small in and out play, probably not even notable. No side to side either. I know it isn't recirculated and I probably won't recirculate it till the snow melts because that's when I'll get it tuned.

EDIT:
Here's the second video

http://www.youtube.com/watch?v=NCtcz9SSbMY&hd=1

Re: BOV Fluttering?
 

link doesn't work. Malformed video I.D. was the message I got.

Re: BOV Fluttering?
 

try it now. ....tried to embed it but probably used the wrong code.

Re: BOV Fluttering?
 

Is the BOV return hole on the intake blocked off and I can't see it? It looks open in that video.

Re: BOV Fluttering?
 

thats some serious flutter man check your hoses going to the bovdoesn't look like it is to me =/

Re: BOV Fluttering?
 

there's 2 of those vacuum hoses on the bov and i have the top hose from the bov connected going to the intake manifold and just left the bottom one open. as for the intake pipe itself, I also haven't plugged the 2 other holes so nothing else is connected to the intake pipe.

Re: BOV Fluttering?
 

thats where the issue is they both have to be connected and im pretty sure you can just connect them both to the same source

Re: BOV Fluttering?
 

^ or block one off.. Pretty sure I blocked off the Greddy S that I had..

Re: BOV Fluttering?
 

hmm, yeah, that would make sense to block off the lower one.

Re: BOV Fluttering?
 

one might be for a higher boost setting so try it on the other one too

Re: BOV Fluttering?
 

You have to plug the BOV return on the intake pipe otherwise you are letting in unmetered air. Even if you dont recirc the BOV you have to plug that hole in the intake.

Re: BOV Fluttering?
 

Leave the lower port open, so that the diaphragm can move up and down freely. And you need to plug that open hole in the intake after the MAF.

Re: BOV Fluttering?
 

That's all compressor surge. Where do you have the BOV vacuum hose hooked up? The BOV isn't even moving.

Re: BOV Fluttering?
 

Is it an ebay bov?

Re: BOV Fluttering?
 

What? No it's not.


http://www.youtube.com/watch?v=nCj6Spwl1CU&hd=1

Re: BOV Fluttering?
 

yep...yep it is :( this is possibly a reason why also.

I really doubt it is compressor surge because if it was, i'm quite sure i can play with the compressor wheel but thankfully it isn't like that.

Re: BOV Fluttering?
 

x a million. Does nobody know what true compressor surge is??????

Re: BOV Fluttering?
 

That is not compressor surge. Compressor surge only happens under load when the turbo is near peak efficiency. See Kevin's video.

Your BOV is fluttering, but it's nothing to worry about as long as it holds boost. You can screw down the bolt on top of the BOV to give it more tension and that will help prevent the fluttering and cause it to only be open or closed. To be honest, as long as the car runs fine, drives fine and the BOV doesn't leak then it can act however it wants.

Re: BOV Fluttering?
 

It doesn't appear it is opening at all. You sure you vac reference is hooked up correctly.

Re: BOV Fluttering?
 

doesn't having a non-opening BOV still put unnecessary stress on the turbo?

Re: BOV Fluttering?
 

How is it the bov fluttering when the bov is not even moving?

Re: BOV Fluttering?
 

I'm pretty sure the BOV doesn't open much if at all when revving the engine freely.

Re: BOV Fluttering?
 

Mine is very visible when free revving from under the hood....

Re: BOV Fluttering?
 

maybe I missed it... was he saying it opens under load? I would agree that it not opening during a free-rev isn't really something to be concerned about. I dont think I've ever had a car that does.

Re: BOV Fluttering?
 

This. Me either, my cars have always had to be under some kind of load.

Re: BOV Fluttering?
 

I mean, I suppose maybe if i had free-revved it to redline perhaps. But why would you want to do that? I have never felt the need to show off that much.

Re: BOV Fluttering?
 

This is just free rev in the videos, I'm just free revving it to around 3-3.5k but definitely not enough for boost. I'm sure if do keep revving like I'm going to launch it will hit boost but I do not at all want to hit boost because of being un-tuned. It's just that I've never heard of my car doing this. It still concerns me because could it possible damage my turbo sooner or later? Is the air going back to the turbo making this sound? I will slap on the 1g bov soon and update it with another video. I will also plug all the holes in the intake after the mas also just to see if the blindly cures anything.

Re: BOV Fluttering?
 

yeah it shouldt be fluttering but i dont think it would do damage, whats wrong with a stock 1g bov?

Re: BOV Fluttering?
 

nothing is wrong with the 1g bov. just gotta drill in the holes on it so it will mount on to the greddy flange

Re: BOV Fluttering?
 

It should be just fine. The Tial I had on my dsm did that with anything under 11psi, and I never had any signs of premature wear on the two turbos I had on it in 3 years.