I'm still plugging away at it. I don't have enough memory to brute force things to get good results so I am tweaking my mesh at key places. My results are getting more believable.
Also here is a validation model with known wind tunnel results.
discussion
TUMWAER: Automotive
more discussion about the models
http://www.aer.mw.tum.de/en/research...otive/drivaer/
even more discussion with an email to request the models in IGES or STEP format.
http://www.aer.mw.tum.de/en/research...vaer/geometry/
a paper with CD and other info
http://delphi.com/pdf/techpapers/2012-01-0168.pdf