recently i have noticed that once in a while the secondary turbo doesnt seem to come online as hard as it usually does. it has only happened a few times, almost always in second gear for some reason. it seems like the car is almost missing. most of the time it runs great, like its suppose to. i have kept up on all maintenance and replaced all vac lines. most of the time the secondary turbo sits me back in the seat hard, so i can really tell when its not working 100%.
one thing i havent replaced is the check valves in the vac lines, dont know if thats hurting anything, they seemed to be working correctly when i changed the vac lines. i know i really need a boost gauge to know for sure.
are these early symptoms of something that needs replaced?

 

Yes, but get a boost gauge for sure.

 

For $20 changing the check valves is good first step and also good preventive maintenance.

 

where can you get new check valves? and im having same problem 1st turbo boost to 10psi then slown goes down?

should i chabge all my vac lines?

 

If you change all the vacuum lines, I suggest you prepare to test the components too. It's a great opportunity to straighten out everything in the turbo control system, but IMO it's not something to start when you want a quick fix.

Dave

 

You can get new OEM check valve from your Mazda dealer. Dale Clark sells viton check valves on here.

Joe

 

Buy Dales Viton ones. I installed them and there is a HUGE difference in the valve response. My stock ones barely allowed any air through. Also check that the charge control actuator operates properly, It my be sticking or have a leak.

 

how do you check to see if the charge control actuator is working ok?

 

hey, Depending on how often it happens and how your driving at the time, but as far as i know once the second turbo comes online at 4500rpm the turbos stay non sequencial until the rpms drop below 3000rpm, this as far as i know produces turbo lag giving the feeling of the 2nd turbo not working properly untill higher rpm, Might be this , correct me if im wrong

Mark

 

The KOKO test is effective.

http://www.fd3s.net/boost_test.html