Google is your friend (but not guaranteed accurate...):While I'm typing, does anyone know the drag co-efficients of mk1 mx5's
with roof up and down. When I'm racing at Pukekohe my car gets an extra
5kph of speed down the back straight with the roof up, so roof down
creates quite a lot more drag...
http://forum.miata.net/cgi-bin/ultimate ... 6;t=008484
From that page & quoting some guy called 'FormerDatsun510Man':
"The official drag coefficients I've seen are (top up):
M1 (NA): 0.39
M2 (NB): 0.36
There is somewhere else I read where it actually showed the drag Cd with
the top down. I'll see if I can find it. I believe it added .04 or .05
to the drag Cd with the top down. Popup lights up on the M1 I'm not sure."
Another page shows .37 for a NB
http://www.carsdirect.com/research/mazd ... h/features
