ATTENTION: This site has been created as a public webpage where I can post information about my Audi S4. You will find links to various topics about this automobile. All opinions and statements are purely my own and should not be taken to be anything authoritative or definitive. Follow this link to read my philosophy on modifications.
Copyright 2003-2005.


Here's a good post to help explain these results. Graph and explanation provided by Makarov.

I found some interesting cooling performance test results here at work that actually help clarify why audi put the fog lamps in a place which might seem to block cooling to the intercoolers. the results show that the plan-view curvature of the fascia forces air around the vehicle in such a way that at some point, no air will flow into the openings; it will instead flow tangent along the surface. That point is dictated by many variables, mainly the curvature of the fascia, but also the velocity of the flow and the shape immediately surrounding the opening (the presence of air guides, for example). in the case of the car tested here, there was not really any cooling gained by opening up the outer most area (similar to the S4 foglamp area).