[apk919]

Originally Posted by Ken Wright

the set up with the standard roof intake and the side intakes is going to be great at circulating air in front of the intercooler and not pushing the air through it. The path will be: in the side scoops and out the roof scoop. The air will take the path of least resistance and this will be out the roof, not through the intercooler.

Originally Posted by qball

Put some puller fans on it...

And I'm not sure I agree with your theory... that through the IC is less restrictive then the tiny roof opening...

I'm with qball on this one... air will flow from a high pressure area to a low pressure area... and I think that the fact that air flows from the inlet through the intercooler makes it clear that the inlet is at a higher pressure than the engine compartment. Yes, there's some inertial component here too.. but:

One of the parameters I'm logging is barometric pressure. Unfortunately my "fixed course" has a lot of elevation changes, and although I'm also logging elevation, I haven't tried to "normalize" the pressure readings yet (it may be possible to do that). But there is a clear trend in the data that shows that pressure behind the intercooler drops with increasing speed...

I'd have to guess then, that if both side ducts were combined with the roof duct, all the air would still flow through the intercooler. Maybe I'll actually find out...