I've got a cbrd turbo, head work, hks cams/gears/belt/springs/retainers/IC/injectors, 3" turboback blitz etc etc.
now when i was trying to increase my boost (currently running 1.7 bar peak coming down to 1.4/1.5) i realized no matter how much i turn the MBC the boost remains the same (yes! i know i should do a BLT first which i will this weekend)
so do to first checks i cross check all the pipes, couplers, bends etc and it was the same boost again so i though i will give MBC a check and boost source was connected to port 2 and WG to port 1 and when i blew air from port 1 it was passing thru no matter if i tighten (move it to +) or loosen it (move it to -) but when i blew air from port 2 it wasnt getting thru.
So that when i thought i should ask you guys here.

So it seems like this is normal behaviour? right!

 

your other issue could be too soft of a spring in the boost controller-

as mentioned-

pull the line off the WG actuator, if it boosts over 1.7 then there is an issue in the system somewhere-

cb

 

Do something for me. Back out the adjustment knob on your MBC counterclockwise all the way to the absolute softest setting possible. I mean adjust it to as low a boost level as possible.

With the MBC set this way go out and do a WOT run in 4th gear. Watch your boost gauge. What boost level does your turbo boost to with the MBC set at full soft? This will be a close approximation of the WGA's spring pressure. It should tell us if the actuator is preloaded or not. Let me know the result of this empirical test.

I am guessing that your spring pressure is going to be somewhere around 13-14 PSI at the most(under 1.00 BAR). At any rate....let me know.

 

Hey, BTW what DV/BOV are you currently running on your Evo?

 

I will update the results today, i'm running evo 9 BOV.

How much boost evo 9 BOV can handle before it starts leaking?

 

The stock metal IX DV is generally considered to be good to about 25 PSI uncrushed. But, actually they can vary from unit to unit. Some are weaker. Some are stronger. They "crack" and start to lift at anywhere from 11-14 PSI. Some are already full open by 18 PSI. I had a wimpy one that started to lift at 11 PSI. So, I crushed it. Like I said they can and do usually crack and partially lift at fairly low charge pressure levels.