Trying to figure out whats going on I read people say its normal for a bigger turbo some people say its an issue.

I orignally had a 9 turbo and everything sounded good

switched to the Kinugawa 25G turbo and now I get a fluter noise each time. My bov is installed correctly I made sure of it.

need some help or advice

I have an evo 9 bov crushed at 26psi , it happened before I crushed it at 23psi

 

how much boost? could it be bov not holding? i peak 26 psi on my 9 bov but i have heard they dont hold much better beyond that.

 

Also what BOV? Some are WAY better designed and can hold partial throttle better than others

 

It almost sounds like a BOV issue to me.. I was having the same issue and ended up getting a TurboSmart Dual Port and it hasnt been a problem since.

 

evo 9 bov sorry forgot to put it in there,

 

It's called compressor surge..

Just because you crush a 9 Dv to make it hold more boost doesn't mean it's designed to do so.. Since the spring is further compressed, the valve doesn't have enough force to open all the way during part throttle. Since you switched to a higher flowing turbo, the increased air on top of what the valve can move is backing up into the turbo making the sound. You should start by buying a proper valve.

 

Cool thanks man