When you shift the bov should release all the boost once the tb is closed so the turbo keeps spinning so when you shift into your next gear boost should still be at or near where it was right? When I shift my at redline at full boost the turbo feels like it has to build boost again as if I downshifted from cruising on the highway to 3rd gear. Is my BOV too tight? It is already very loose. The screw is near the end. The screw is what controls the bov right? The nut is just to hold it on correct?