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Originally Posted by Cd
Something like this truck here that had a .315 Cd.
I was surprised to see some - open bed - GM truck studies even dipping into the .20s ( .28 - .29 )
That's a lot of turbulent air flowing back there. |
I can think of at least six aero mods that were done to the S-15.
The original half-tonneau was only good for an 8% drag reduction on the C-10 pickup.We don't know for sure what its effect to the GMC was.
We do know that the rear has reattached flow and that it captures a vortex in there.Here's the GMC (bottom)
Here's a link to an article about the 1986 Pontiac Grand Prix 2+2 with its aeroback rear treatment for NASCAR slaying which illustrates one car's different 'attitude' to the air
Homologation Hotness - 1986 Pontiac 2+2 | Hemmings Motor News