How do I tell i have bad Bov? I recently upgraded to 9 turbo, 1000 cc fuel injectors, aem e85 fuel pump and e85. I went from 15 lbs of boost to 30 lbs. I have a forge rs bov valve and I have tried adjusting it to different psi, still getting a loud fluttering sound at half throttle

 

did it flutter before with the same forge rs bov?

partial boost and stiff bov spring setting will cause fluttering.

u can do a boost leak to see if the bov is leaking.

 

Get rid of the forge rs bov valve.

 

It never did that before...I think im just going to get rid of it and put my big boy pants on and get a tial lol

 

15 psi and it didn't flutter? Wow!

 

I thought the RS was good for up to 23psi from looking at the specs last.

 

Yea they'll hold a shi t ton of boost, they just won't let it go and modulate it at part throttle very well.

 

+1 on getting oem style dv. Evos don't like aftermarket dv's.

 

I purchased my car with a hks bov and had nothing but issues. Went to stock and it's been mint

 

Just something to think about, I've ran I to this in the past and have found that installing a vacuum check valve in the line from your manifold to the bov stopped the flutter of my turbo.
Make sure it's installed so that the intake takes a vacuum on the bov.
The "pills" in the stock lines are not enough to prevent the flutter. Good luck.

 

OEM 9 BOV is where it is at, if you're running more than 30 PSI though I would go with a TIAL, and if you're running more than 30 psi, you better be on speed density and not maf

 

Never thought of installing that...appreciate the help

 

I am running 30 psi right now so I think a tial is where its at.. my mechanic recommended going sd, but why is it a must after 30 psi? Just need more info on that

 

Wrong, wrong and wrong.

There are no "pills" in the recirc valve line, you're thinking of the boost control line.
A check valve in the recirc line would cause the valve to open under boost, you need pressure to the top of the valve to keep it closed under boost.

 

Yes pressure the top to keep it closed like cfdfireman1 said