So that low throttle woo sound from the forge bpv that's exptremely annoying. I finally solved it.

So here is what to do. Take apart the bpv, grease it up good after cleaning. Then take the lid with the vacuum nipple on it, take a drill bit that's slightly bigger than the hole, cause that hole is small compared to other bpv / bpv. Carefully , and I mean carefully, drill the inside hole on the inside of the lid bigger, then drill the nipple hole bigger. Watch on the inside so u get in there all the way. After I did it, it actually made the bpv quieter, and u either get a nice pshhh sound, or u get the Turkey gobble sound that sound so good , but that's only at higher boost. That middle horrid sound is gone. Your welcome

 

A woo sound?

 

lol its like a really annoying wooo without the shh at the end. I don't know how the explain it any other way, trust me if uv heard it, u know what I mean

 

I get turkey all the time, but not sure of woo.

 

Even on low rpm light to no boost?

 

Stock bpv i got the turkey all the time. With the forge i rarely hear it

 

Did you say wooo?

 

Ya stock was much worse on the zfr for that sound. That's why I took it off.

 

Good to know. Think it's just caused by the valve not opening enough with the smaller surface area in the tube?

 

Ya it's a bigger turbo, same size hole to vent at the k04, with a tiny opening in the nipple . All those thing combined I'd think. But drilling it out sure does help, more than I thought it would

 

So what size bit did you use?
Wouldn't want to go to big, I'd imagine, else it might become weak, and break.

Wish there was a way to get rid of the flutter.

Still not sure about this whoo sound. I'll have to remember to listen next time I go out. Kind of tuned those noises out now.

 

Idk what bit size it was, I just took one that was a little bigger but left a lot there still. My bits are mixed up somewhat but I'll check at home

 

So has anyone else actually tried this?
Results?

 

I should add too this, have found more things that would help

 

Please do.

 

Well I'd say to get optimum performance is do what I suggest above. Then drill out the port on intake manifold and tap to I/8 npt. And run an an4 line as close to bpv as u can then use an4 to hose barb to goto the bpv. I'm sure that will drastically improve it. I had a stock size line on my bov on k04 and it took to long to open. Did an4 for my 257 with same bov and it opens instantly

 

I also ran an4 braided line from my intake to tial q bov and it opens instantly. Definitely the way to go and not expensive to do plus it'll make your engine bay look that much better.

 

Pics by chance?
Or better yet a video?

Anyone else actually dry drilling out their forge BPV?
Or the rest also?

Be nice to hear others opinions, like Powell's, and Tems.

Sounds good, and would like to make this better for sure finally, but at the same time, hard to undrill.

 

Ya u gotta be super carful too. I don't have the forge anymore so I can't show.

 

Thought I posted pics , guess not

 

Oh? How come? What are you running instead?

 

S257 setup on built motor. Tial bov