Hey turboge- the MBC is pretty sensitive, but that was done so the guys running 25 + psi can use the same MBC as the guys running 10
.. A lot of others still require a blled or something after a certain level to run high boost. If the adjustment is too sensitive, I have lighter springs here that will make it a lot easier to adjust, it just won't hold high boost. All you had to do was ask
.. Let me know if you want me to send you one.
The issue of the boost dropping off is likely not the BOV. It is NOT THE SAME as a 2G eclipse. Although it is plastic, it is a SLIDE style (similar to a motorcycle carb) and it totally blocks the airflow until vacuum sucks it open.. Boost CANNOT blow it open like a standard BOV..
Also, I had brought this issue up with my turbo guy a week or so ago- without knowing the exact specs on the turbo yet, we can only assume, but we feel it is the weak wastegate spring allowing the gate to open up at higher RPM's/exhaust pressure due to the spring not being able to hold the flapper closed with all the back pressure of the stock exhaust. Mine got a bit better when I gutted my cats, but it still does it. It may even go away completely with a bigger, free flowing exhaust. We are also trying to find a heavier actuator for me to throw on my car and see if it still does it, I will keep you guys posted. He honestly doesn't feel it is the turbo because even the smallest of the GT25R's will hold 16-18 psi on a 2 liter. And, for those of you who still think it is the same as a regular T-25- that one will hold 14-16 psi with no problem also- so it *shouldn't* be the turbo..
As for the IC, it is not the best, but it is not that restrictive that it would not let the turbo sustain 50% of it's capable boost levels
..
Trust me, the car is in the right hands to get to the bottom of all the *mis*information out there
.. I will have the boost dropping issue taken care of soon enough.
Joe