ford4v429

[quote name='JETSOLVER' date='Jun 13 2006, 08:38 PM' post='20303']
As reported in the July 06 Hot Rod, the Cd of the GT500 is 0.38.
[/quote]


guess the shelby grille opening must be a bit more draggy?

any chance someone might want to share the formula for drag/hp/mph? never even looked for it yet, but would be kinda fun to see what the hp demands plot out to like from 60-80 mph, kinda curious just how much that really affects fuel economy...my 85 camaro got a best mpg of 35 @ 85 mph across new mexico- usually got mid 20's, always wondered if some cars due to gearing/torque peaks/drag can actually get better at higher speeds?

easier question maybe: has anyone with IUP ever checked instant MPG on a flat highway at 55/60/65/70/75/80 just to see where these cars run most efficiently? If so, is your car a stick or auto?

paco_pony

d'you get your speedometer recalibrated with the bigger wheels and gears?

paco_pony

guess the shelby grille opening must be a bit more draggy?

any chance someone might want to share the formula for drag/hp/mph? never even looked for it yet, but would be kinda fun to see what the hp demands plot out to like from 60-80 mph, kinda curious just how much that really affects fuel economy...my 85 camaro got a best mpg of 35 @ 85 mph across new mexico- usually got mid 20's, always wondered if some cars due to gearing/torque peaks/drag can actually get better at higher speeds?

easier question maybe: has anyone with IUP ever checked instant MPG on a flat highway at 55/60/65/70/75/80 just to see where these cars run most efficiently? If so, is your car a stick or auto?
[/quote]


formula I use is [(engine torque* final gear ratio* driveline efficiency) / (tire radius)] - [(vehicle weight)* (0.01 * (1 + speed / 100)] - [drag_coeff * area * air density* 0.5 * speed ^ 2) ] and then the whole thing is multiplied by Gravitational constant/ total wieght.

first term is engine force to tire, second term is estimation for rolling resistance, third term is drag resistance.

Scottbert

The only reference I could find is this article that says the cd for the Shelby GT500 is .38.