I have installed an MBC with boost gauge to monitor turbo boosting for safety.

I have fixed the boost on 1.2 Bar (almost 17.4 PSI) and noticed no issues when starting to accelerate from 0 speed it just working perfectly and no knock sound nothing.

However, when I accelerate from 60 Mph I can see the boost reaching 1.4 & 1.5 Bar (20.3 to 21.75 PSI) no matter what gear I am at (tried it on 6'th, 5'th and 4'th gears, to try different gear ratios with the boost). When that happens, I can hear some knock sound coming in.

I don wanna destroy my turbo and my engine so appreciate any feedback on what to do and what to avoid.

One thing in mind, I thought of trying to reduce the boost through the MBC but I am not sure of the results!

 

damn. shouldn't drive like that. i would suggest you put stock bcs back on and get tuned for the mbc to be safe.

 

Thanks man..

but what is bcs?

And it is not possible to get the tune done with the mbc on?

The whole idea behind the mbc when i 1st installed it was to restrict boost because without it the boost was 1.4 bar itself!

 

yeah if you get it tuned with the mbc on it should be fine. did you have something that looked like this? http://www.andywdesign.com/misc_images/oem_bcs.jpg

 

oh i believe i did.. if i am not wrong, this thing was attached on the right side of the engine to the vehicle's chassis and working as a boost actuator right?
I believe this is the one that was replaced with the mbc and it was not functioning properly the time i replaced it.

 

you should have had one if you installed a MBCs. if its not working just pick one up from ebay or junkyard. they are expensive at the dealer..(what isn't) suppose to boost around 13-14 psi i think stock..