Manual boost controller has a whole in vacuum line ?

[Dominasian]

When i bought my car i didn't inspect it well so i later i found that at the boost controller i have a vacuum line and a spacer in it with a hole, i wonder if its normal to have a spacer with a hole in a vacuum line, when i performed boost leaks test i heard a hissing sound and that's how i found it, in my understanding the system must be pressurized meaning it must have absolutely no holes to let the air out, but my car has that spacer, and now i wonder if it is actually suppose to be there ?

 

[Shnizzle]

there should be no 'open' lines going from either side of the controller.

can you elaborate about the hole more? is it a rip or an extra coupling from the spacer?

 

[Breezio69]

Are you talking about a reducer inside the vacuum line? Some people put them in there to steady the boost signal.

Sorry it was a little bit confusing.

 

[Dominasian]

there should be no 'open' lines going from either side of the controller.

can you elaborate about the hole more? is it a rip or an extra coupling from the spacer?

Its like a spacer between two lines that lets the air out, vacuum lines on both sides are not blown nor they have holes its just this spacer with two nipples that connects the same exact vacuum line (left side of the boost controller) kinda looks like this: Vacuum line > =||= >vacuum line

 

[RamenPride]

There should be a very small bleed hole somewhere on the side towards the wastegate actuator. The design of the MBC doesn't allow pressure in the line to go in reverse. Without the hole, the line to the wastegate actuator would basically stay pressurized leaving the wastegate flapper open.

 

[Dominasian]

There should be a very small bleed hole somewhere on the side towards the wastegate actuator. The design of the MBC doesn't allow pressure in the line to go in reverse. Without the hole, the line to the wastegate actuator would basically stay pressurized leaving the wastegate flapper open.

Ok, if this IS a bleeding hole then it must be in the right side of the MBC and not on the left. Maybe who ever was installing this MBC confused the lines and put that spacer with bleeder hole on the other side of the MBC?

 

[Shnizzle]

There should be a very small bleed hole somewhere on the side towards the wastegate actuator. The design of the MBC doesn't allow pressure in the line to go in reverse. Without the hole, the line to the wastegate actuator would basically stay pressurized leaving the wastegate flapper open.

id have to agree with this. Do you even have a MBC?

 

[Dominasian]

yes i do have an MBC, not that stupid... I read some info on the net and figured that there are two types of MBC, ball spring and bleeder ones. Basically i have a ball-spring one, i took it apart and found a BALL and a SPRING, but for some reason there is a bleeder whole, idk why. I am going to get rid of that thing and get a straight vacuum line to the wastegate so i don't leak any air...

Well now that i know how both types of MBC work i know for sure that my set up is wrong. Basically with a bleeder type, you have the same set up but instead of having the pressure to crush the ball open inside the MBC you have a hole where all the air is going. in both kinds of MBC there is a screw to adjust your PSI, but this screws do two different things: In bleeder type this screw opens up a hole and closes it, more you close the whole the faster you waste gate will open and opposite. With Ball Spring type, same screw will press on spring that will press on the ball, the harder you screw it in the more boost you will have and opposite.

Bleeder type MBC is kind of a boost leak for your car, instead of having pressurized system and let pressure crush the ball to open waste gate you just simply make your turbo work twice as much getting air and letting it out when ever you have a desired boost.