Quote:
Originally Posted by eou_edu
I bought an old suzuki samurai and it has what I call a "high school paint job." Where someone just rolled bedliner over the entire thing. With the rough surface everywhere it got me thinking about how much that would potentially effect the wind resistance. I know some studies that say putting golf ball dimples on a car can help but I assume a rough and inconsistent pattern of which a bedliner paint job I think could really hurt your drag and not help. Any guesses by how much?
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Ford in 'proper' testing found dimples increased drag.
As people have said, I don't think the bedliner coating will make any measurable difference - especially on that vehicle.
That said, on some specific parts (eg exterior mirror housings) a rough coating has been used to trip the airflow (changing it from laminar to turbulent in boundary layer), so reducing noise. (P 235 of my book, for people who have it.)