DN
I think your right on.
From what I got tonight it was the reservoir available.
The blower will wick what it needs, its not the speed of the air but volume available.
Paul
Thats the problem, if you start letting the blower create a vacuum at its inlet, the temperatures sky rocket at that point, and it will only create so much vacuum before it can't draw anymore, and its not capable of creating alot. When I tested the stock 94 plenum on a 94 blower, I found that the temperatures started sky rocketing with over 10% OD on it. Once I put the MP plenum on the blower (this blower was very well ported) I was able to get more CFM out of the blower and the temperatures stayed down until after 15% OD.
I am seeing the exact same thing with the MPX blower and its plenum. At 15% OD, I can take the motor right up to 6000 and the drop starts there and becomes noticable at 6200, and the temps start to climb at that point. Go to 25% OD and you'll see the same thing only starting at about 5200.... This falls into line with flow bench testing that Dave Dalke did with these parts.
You can't depend on the blower to get, or wick what it wants, hence the reason for the big CAI systems required, since those rotors will only fill with atmospheric pressure. Any kind of vacuum on the inlet side and the blower's VE goes down hill very quickly. This is the reason I am suggestion trying to increase the velocity of the air as it travels to the blower, just like cylinder filling when the intake valve opens on an N/A motor, you start with a large opening and narrow it down to the back of the valve to accelerate the air going in.
Volume is important, and accelerating that volume to the blower will also help fill the rotors at high rpm's, which is where the MPX shines. It would be detrimental to start with a smaller MAF, got to a 95mm TB then go back down to a small inlet plenum, as the turbulence would slow flow down considerably, and you could have less flow than sticking with an 85mm TB on that setup.
Fraser