Twin turbo boost cut issue on Legacy b4

Hi guys,

My mate has a jap Legacy Twin turbo, which is experiencing some issues with the Boost cut. I have no clue how the twin turbo system works in the legacy.. so thought I would ask here.

It runs ok on the first turbo (pushing around 0.5 bar) then there is a boost drop to 0.2 and the second turbo kicks in, but both boosting max 0.6 bar.

Any ideas?

I'm having the exact same problem. 0.5 on primary is only half what it should be so issues on both. It's part of the reason I'm ditching the twins and going single.
Sorry, this post is of no help!!

Sounds like limp mode. Reset the ECU and try.