I have Apex'i AVC-R installed on my car like 1 yrs ago.. it worked fine till yesterday but today even primary turbo is always lower about 2 psi then i set.. like if i set 10psi it only boost up to 8psi... also i boost is kinda going jump'n up and down when pass 10psi... it barely made to 10psi even though i set 1BAR. secondary seems fine.. but only primary... any idea?? maybe vac leaking??

thanks!

 

could have a boost leak, could have worn turbos, could have a faulty valve on the avcr....theres a bunch of things that could affect it.

I would check the hoses first but I dont' think that is the issue saying your secondary turbo works fine. I would assume that your turbos need replacing.

 

yeah i think my turbo is bad or something.. just checked Y pipe and intercooler pipe.. and most vac hoses.. looks like time for single turbo...! secondary turbo pulls over 10psi though... werid. thanks for replyin!

 

Keep in mind the primary turbo is smaller, so if you have a split or popped off hose, the primary will be affected more. I'd bet you lost a hose.

You might also check the pre-spool door is pulled shut tight, or you could lose boost on the primary this way, too.

 

Nope. Both turbos are identical Hitachi turbos.