seems much easier to produce in 1st and 2nd, usually ok in 3rd, i'll hear like a leak/grindy noise @ changeover for a split second when it works fine, i'll continue to hear that until sometimes 5500 or 6000 or 6500 or 7000 in 1st/2nd and boost stays @ 2psi, i changed the circlip on the tca (was missing), replaced the cracked y-pipe hose to crv and checked all the lines I could get to, no cel's, what now? check valves? *frustrated*

 

did you check this website

http://www.autosportracetech.com/RX-7/symptoms.htm

 

are u in sequential? If you are check your vac lines. If you have done that check your turbo control actuator