Could a leaky coupler allow primary boost to boost fine but then when it switches to secondary bleed the boost down to 3 psi or less?

My boost patterns are as follows:

sometimes I get 10-8-3
sometimes 10-8-5

ect. ect.

anyone have any idea on this?

 

charge control actuator and its controls
had a similar problem

 

i have a 10-8-10-8 pattern...basically the boost on my secondary turbo doesn't hold at 10

Is there a drill for systematically searching for root cause?

 

i think that pattern is correct depending on when the boost falls off at 8 psi.is it in the high revs?

 

http://www.scuderiaciriani.com/rx7/boost_test.html

 

Thanks for your input guys


I think I am going to change out all my couplings because I found a few small holes in them, then if that doesn't work I will just get a new solenoid

 

If you get 10 psi on the primary, its not likely that you have a leak.