[mikeinatlanta]

Originally Posted by ERA2076

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 -
Thanks, while I share your curiosity with testing a more diverse range of conditions, the testing I did makes it very clear that the radiant heat from the tarmac is not absorbed by the air, and any that is absorbed is quickly mixed with surrounding to form the wider ambient. In hindsight it should come as no surprise as ambient air absorbs very little heat on the first pass, which allows the tarmac heating in the first place. I also feel the obvious heat when venturing onto the tarmac, but the data is clear, it is radiant heat, not actual air temps. I believe the biggest flaw in my testing is the reference sample. I believe the reference was artificially high due to radiant heat from the shaded ground. While irrelevant to the on track temperature/elevation gradient, I believe it was giving an artificially high ambient of about 1 degree at 75.





How much pressure do you expect @ 100mph with divergent? While I have the technology to design an appropriate divergent, that calculation is beyond my abilities. We well have to find out with data acquisition.

I don't think you ever told us the intended use of your car? I assume by the aero, road race.Trailer queen, show car, waxer fodder, just another fpsb. .

Will you run a splitter? A splitter is included in the high downforce configuration. I will be using wind tunnel data to decide if the low downforce configuration requires a mini splitter. If so, it's a three hour add on and will not be used for the street.

x-chr

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