I tried to search this, but my pc wasn't didn't seem to want to display the results page, so I figured I would ask. I was just out for a quick drive in my Evo to adjust my MBC and I noticed that the boost won't go much higher than 18, with spikes a bit higher than that. The thing is that the boost controller is turned up as high as it will go. This is my second Hallman MBC (nothing was wrong with the first one, I just felt like switching from the in cabin adjustmemnt to under the hood) and with the other one I can remember being able to get the boost a few psi higher, into the low 20's. I never left it there. It is hooked up right, and my boost gauge is working fine, so my gut says boost leak. I never had that problem before though, until this MBC. Only thing that I did differently in hooking this one up was using one size tube from the wastegate to the MBC and slightly larger for all the other hoses. Any other ideas?

 

put the stiffer spring in!

 

+1

 

thanks, just did that and all is good now. boost was crazy high becuase it is about 20 out now at the most. I didn't think of that because I never changed out the spring before and it worked fine. The stiffer spring is way better. Now I can sleep tonight!