I thought that was the whole idea, to reduce pressure pre throttle so as the air being pressurised by the compressor does not dead head against the throttle butterfly, causing the compressor wheel to "stall" and possibly damage the blades??
I know you state you use a rubber pipe that expands to prevent this, but does that pipe expanding not affect your throttle response? I thought that was the idea of hard pipes, no expansion.
Not dissing your views, just asking your thoughts and experiences on these theories mate.
In racing scenario when you change gear at full boost, your foot is only off the throttle for a split second. At this point compressor surge is minimal, but the pressure of the intake will be increased - so when the throttle is open you have more compressed air mass ready to fill the combustion chambers.
More air and more fuel will give a better combustion, in turn this should give better response.
The expansion of a flexible intake hose means that the energy from the compressed air is being absorbed and stored. As soon as there is a condition where this energy can be forced away then it is. This would be when the throttle is open again.
A solid pipe will not do this, this will force air from back the way it came, back over the compressor turbine. The compressor will never stall, just slow down slightly. My old turbo done 87,000 miles with no re-circulation or atmospheric valve installed. I'm confident that at most boost pressures this will not damage a well prepared turbo.