hi ive been having boost problems n i noticed the vac line forn charge releif valve was perished n crushed so i replaced it n thought all was fine cos it did get a boost patern of 10-7-10psi no it boosts to 10psi when WOT and slowly goes down, n 2nd turbo doesnt kick?

any ideas?

 

I've got the same problem with my 2nd turbo losing boost at the transition. The shop I'm having fix the problem said something about a valve that allows the exhaust gases that bypass the primary turbo might be the culprit. Just something to maybe look into. Hope it might help in some way.

 

cool thanks ill have a look