07-25-2006, 07:21 PM
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#9
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Registered Member
Join Date: Mar 2006
Posts: 1,225
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Quote:
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Originally Posted by MetroMPG
More info I've found about VG's...
zpiloto: yours are/were not on backwards, at least according to the old web site of Gary Wheeler, an Indy car designer/aerodynamicist who originally popularized VG's for use on regular cars (if I'm not mistaken). His were oriented the same way as your photos show.
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I've tested both directions with the same results. I've also tried them at different spacing with the same results. It looks like VG just need to be there to help the flow. The spacing and orientation don't seem to make too big a difference. I saw a 1.5% increase with a 40 MPG base. I personally don't think it worth the trouble as far as bang for the buck but your base is a lot higher than mine. I spent about 8 hours on the whole project including getting material making the VG installing and testing, but then again every little bit helps. 
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