globalmike

I installed a MCB to my original wastegate this is what i did:

removed cycling valve,
added the MCB to the car installed the waisegate side to the outlet side of the MBC
installed a hose from the inlet side of the intercooler to the inlet side of MBC

pluged the J boot hole.

what did i do wrong?

thanks

ilikemy944

If its a black ****, then counterclockwise raises boost.
5psi sounds like spring level on the wastegate.
Make sure one of the hoses isn't broken.

dillon410021

turn it all the way counterclockwise then dial it back to set boost at your liking.

globalmike

thanks for the tips. i have turned the **** all the way till the mbc clicks. it seems like the diaphram is getting compressed but there is no feed back.

if the car is chipped and the cycling valve is removed would this make a difference?

globalmike

is it possible that the wastegate is dead?

i have replaced the MCB with another and the same results. cant boost past 5psi

i installed another boost gauge after the mbc (line leading to wastegate) same 5psi.

this looks like the ECU is just got allowing i higher boost level without the cycling valve, does this make cense to anyone? or have i missed some thing entirely

boerge

I have had 951's that I easily got boosting with MBC's after failure on the CV system.
I have also had 951's that I never got to boost more than 5 psi, even if I spent hours of troubleshooting, including changing the wastegate, MBC, plugged line to wastegate, pressurized intake system and endless things.
It can all be fixed, but prepare mentally for hours in the garage if you are unlucky with the fault.

dillon410021

5 psi is where it would be if the mbc is all the way down. Try turning it all the way one way and all the way the other way and see if it goes up. Also, are you sure all the vacuum lines are hoked up properly.
Use the diagrams on lindsey racing to help

hp18racer

With the cycling valve gone, the computer can't do anything about boost.
Do you have an air compressor a pressure regulator? If so, you can bench test your MBC, it is basically a pressure regulator. Apply regulated pressure (say 20psi) to the in side, see if it regulates to the pressure level you expect on the out side.
Try clamping off the line to the waste gate, CAREFULLY apply throttle. If boost builds, your problem is in your MBC hookup, the wastegate, exhaust and intake are good.

globalmike

So I have more details on the situation. With the car off I pressurized the wastegate and on expecting to hear the actuation of the wastegate or the dump of air. NOTHING. This leads me to believe that the wastegate is dead.

Is this a correct assessment of the problem