steven121

iTrader: (27)

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

misterevo8

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.

prockish_03evo

iTrader: (7)

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

tarmacblack03

iTrader: (2)

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.

steven121

iTrader: (27)

evo 9 bov sorry forgot to put it in there,

djdnav

iTrader: (7)

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.

steven121

iTrader: (27)

Cool thanks man