my car start to have boost leak at 24psi and above.
First I thought is because of the bov or the connection of the hose or pipping.
but I check all the hose and the pipe everything is perfect fits.

change bov couple time and right now it is aps one. still have this issue.

I saw some post before about the hallman mbc bov that you need some mod to hold the big boost. I am trying to search again but cannot find it.

is this possible cause by my mbc?

(when the car boost at 25psi, I can hear ssshhh... and my needle boost gauge moving very fast from 23-25psi, and Then after couple seconds it hold at 25 psi perfectly) So basically it don't drop the boost. it just not perfect boosting


thank you and sorry for my english.

 

How did you know you have a boost leak? Did you do a pressure test with compressed air? Or did you just come to the assumption based on what you hear?

 

yes, So can you clear me out?

 

It holds boost fine but bounces around?

 

yes.... sorry I should say that in the first place

but the bounces around is it normal?

 

Probably a tuning issue more than anything.