Wow - 30 degrees in 1.25" and no significant change after - that is amazing. Regardless of belief, I would not have expected it. 75 is a fairly cool condition. Did you ever run it in hotter conditions? Not debating, just surprised and wondering the affect of radiant off the surface at higher temps i.e. as temp rises the differential zone rises too and is it linear? It has been my experience on a hot day (90+) I can instantly feel the difference in temp when walking from the grass onto the track. It would be interesting to test at Phoenix or Riverside in August.
Appreciate your work -
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At the risk of oversimplification, the divergence will cause the higher velocity air at the inlet to begin "packing" the air as it slows. Also think Bernoulli's principal, as the air velocity decreases, it's pressure will increase.
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Without counting the effectiveness of the divergent system, pure ram air will net ABOUT 1.2psi at 200mph.
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How much pressure do you expect @ 100mph with divergent?
I don't think you ever told us the intended use of your car? I assume by the aero, road race.
Will you run a splitter?
x-chr