It used to boost at 15 PSI with an old APEXI BOV on, but the guy that had the car before me did not have a MAFT on it. It would die after nearly every shift. I ordered a stock BOV from a Mitsubishi dealership in Des Moines Iowa and put that in with a recirculating tube. I have had issues where my boost would not go over 7 PSI of boost no matter what I had my MBC set to. I found out my wastegate got stuck open, so I got that fixed and then I could get it to 8-10 PSI of boost in second gear. It still would not go any higher than that with the MBC.

I built a boost leak tester and have been using it, and fixed several leaks (Also replaced a highly corroded intercooler). It still will not hold any PSI for more than a second with air compressor running. Drains the air compressor from full to zero in less than 30 seconds (Capping the released pressure at 15 PSI). I noticed the stock replacement BOV was leaking out the recirculating tube at as low as 2 PSI, and the manifold is getting air. I am just hooking the BLTer right to the turbo, so I am guessing the one I got may be crap.

There seems to be another big issue though. My throttle body is leaking air pretty bad as well. With soapy water I could not find the leak for the life of me. I noticed when I squeeze the spring-like thing I can here the leaky air changing sound, and I can also feel it on my fingers coming from the spring. I have put a picture below of the area I am talking about:



I don't know if the throttle body leak could be leaking enough air to cause the BOV to release the pressure or what. Please let me know what you guys think.