Put MBC on and boost just goes to 28psi?

[ktowntalon]

I just put an ebay MBC on and I hooked it up correct that I know of but the boost goes to like 25. I dont let it go up there all the time. Just the once after I put it in. But does anyone have any seggestions or forums on how to install it correctly. I've tried all these different ways but they either make boost shoot up way high or stay at like 7-10psi. TAhanks in advance.
ktowntalon

 

[DGajre777]

Turn the boost all the way down. Set it up so that the boost is 7-10psi and then turn in back up to the psi that you want.

 

[marcmsj]

Be sure boost isn't leaking anywhere. It's a good idea to zip tie all the vacuum connections in place after making sure that you hooked up everything correctly. With boost turned all the way down, you should see it holding steady at around 10psi.

 

[tqmx1]

Also make sure your waste gate accuator diaphram is not blown out that will lock the waste gate full closed.

 

[ktowntalon]

I had the boost controller all the way down and I put it on a different way and it stayed at like 7-10 psi and I turned it up almost all the way and it still is at 7-10 psi.

 

[boostaddict1g]

by turning the mbc "all the way down" you are raising boost..you want to make sure that you loosen the bolt as far back as you can while still being able to lock it with the nut so the bolt doesnt come out.

now make sure your vac lines are ran correctly...tee into the bov vac line (aka IM source) for the fitting on the mbc that is inline with the bolt and the perpendicular fitting goes to the wastegate actuator....hope this helps

 

[ktowntalon]

Ok, do I just hook up the tee and run that vacume to the mbc and run the other vac out to the wastegate and thats it or is there any other vacums I need to hook up along with it?
Do I just diconect the other vacumes from the air can and the J-pipe? What about the Wastegate Solenoid?

 

[DGajre777]

Ok, do I just hook up the tee and run that vacume to the mbc and run the other vac out to the wastegate and thats it or is there any other vacums I need to hook up along with it?
Do I just diconect the other vacumes from the air can and the J-pipe? What about the Wastegate Solenoid?

Run one side of the boost controller to the wastegate actuator port. Run the other side to a pressure source (j-pipe or stock turbo port on the T25 for the 2G people). You don't need to T anything.