BOV Flutter

[YiNYaNg]

How does it run with the bov disconnected and line pluged?

Has it been doing this from day one?

[scheides]

In the pic I'm running a t-fitting. I'm currently running seperate runs from the intake manifold to the MBC and BOV. I've swapped springs and added washers/spacers (just like I said above) to no avail.

This has been happening since I installed the forge unit.

[Kracka]

If this happens to both you and Nash it must be a common problem. What do the guys on the EVO board(s) say?

[scheides]

Some people seem to have similar issues, but no one seems to have it as bad as I have...I'm going to do some boost leak tests (again) and possibly swap on the stock BOV this weekend just to see what will happen.

[Kracka]

How about a different brand of BOV? If people have problems with them, why do people continue to use them?

Does the stock BOV leak like a 2G?

[scheides]

I've heard nothing of this sillyness when I bought my forge. Nash says his car did it, but I can't imagine it is as bad as my car is. When driving at the limit, having partial throttle control is absolutly necessary, and it just isn't there on my car. The car falls on its face and I feel like I'm gonna die if I push the limit too much.

The stock BOV doesn't leak as bad as a 2G, but it is cheapo plastic, so I imagine it won't hold up to much abuse.

[CDeutsch]

The IX's have a different BOV and so far people think it's better. Just another option to consider.

[scheides]

Well, after swapping in every possible spring/shim combo, several boost leak tests, and a bunch of just driving, I gave up. I swapped in the stock DV/BOV and the fluttering is gone.

WTF should I do now? The stock DV is not going to hold up to what I have in store for it. New Forge? Go for something else? I'd go straight to a Tial, but I am still running the stock MAF. :P

[Kracka]

Hks

[scheides]

I'm gonna try getting a bung welded onto my LICP and see if that helps. I'm thinking the MBC and BOV seeing the same boost pressure (i.e. manifold pressure, after the TB) is causing some sort of weird loop: the BOV opening, dropping pressure in the system and making the MBC ball/spring close thus shutting the wastegate, which instantly causes boost to rise again. As this happens, the pressure in the IC piping is slightly higher than in the manifold, causing the BOV to open, dropping pressure in the IC piping and ......ah fuck it I'm gonna go buy a FORD :(