I have this whistle @ hight rpms sounds like a boost leak. I pressure tested my system and just found the only leak is the little hole in the mbc and it makes a crazy whistle. Has anyone else experienced this? Maybe a different brand wont do this?

 

Its funny you posted this, last night i pressure tested my car and i heard the same noise from my mbc. There is a little hole on one of the nuts, i am not sure why its there but i am sure its there for a reason.

Anyone know the reason for the hole?

 

Normal , its bleeding off air from thr MBC to the WGA . If it didnt bleed the air the WG would have a hard time closing .

 

IT sucks b/ i hear it while driving..... Holds boost great though

 

Never heard this, probally not loud enough over my intake and turbo.

 

maybe its just me lol or my car makes a funny noise

 

Mine is not loud at all , you can hear the "ball and spring" bouncing back and forth over the bleed hole and only when pressure testing never when driving .

 

mine is not loud at all you might have a leak elsewere

 

no whistle from mine

 

Mine did the same thing, I actually switched that nipple part out w/ an old AMS mbc that I had lying around. When pressure testing the car that was a big leak for me. Once i swapped it out the system was able to hold more pressure for a longer period before leaking down.