53 willys

So I am trying to set up my scantool's Dyno/speed tracer program and I need some info...when I used it on my Mazda3 I was able to get on Mazda's site and find the Coefficient drag.
well I tried that on the dodge site but it does not show it ANY place on the site
So does anybody know what the coefficient drag is on a 06 mega cab????
I tried to Google it,,, but nothing
Thanks for the help



if there is a better place for this Mods please move it????

vzdude

I don't think they post it for 2500's and up due to not having to rate them for fuel mileage. Any info on a 1500? Should be the same, or very close.

trik396

Drag coefficient is calculated as a very large BRICK....

sorry but I had to...

mikmaze

closer to a cinder block, I'd be happy with just a brick.

53 willys

anybody know how to figure it/do math????

WAM

Yes, you can do it with math. It's called Computational Fluid Dynamics and the software probably cost's a million dollars or so. Mostly people do it in a wind tunnel. You probably aren't going to get it done on a WalMart calculator.

Drag coefficient's got nothing to do with size, just shape. Since one truck's pretty much shaped like another, I'd look around and find a number to stick in. I'd bet all late model pickups are close to the same. In case anyone's wondering why size doesn't matter, it's because the drag formulas factor that in as a separate value. So yes, it does matter for actual drag.

-- Bill

53 willys

found it for a 2000 CTD but nothing still for the 06 trucks or even the 03's
I would like to find it for the 3rd gen trucks...

2nd gen 4X4 drag Coefficient= .48


http://www.pickuptruck.com/html/ram_specs.html

53 willys

.45 on a 2005 SRT10 .......

tristan21

I was wondering a similar thing a while back. I am curious just how much difference there is in the height of the vehicle. I would think there would be a dramatic difference for every 1" higher off the ground you are. May be why the srt-10 is a lower # also. The salt flats guys are as low as they can get for a reason.

On a side note I wonder at what speed you start to get lift in a vehicle that weighs 7200lbs. If I were to install a gear vendor and change gear sets or install a quick change rearend and get whatever gear ratio I wanted what the top speed would be. Surley that couldnt be dangerous in something that big right?

gsbrockman

My wife's 2005 Jeep Liberty Limited CRD 4x4 has the "small brick" syndrome.

Mark03Ram

drag co is only a small part of the equations, frontal area plays a far greater part in aerodynamics then drag. Lowering a vehicle reduces the frontal area and does little to nothing to reduce drag coefficient, major changes in the shape of the front end, underbelly and tail section are required to reduce drag.

I been racing bikes for some time, and recently have gotten very interested in top speed racing. The Hayabusa is the most aerodynamic of all bikes has a drag of .56, it only has about 8sq feet of frontal area with the rider in crouch position, 160 hp is enough to push it to 190mph.

ram 4x4 has around 40sq feet of frontal area, the higher you raise the truck the wider the tires, the more lights and bars you put on the more the frontal area goes up. The force on the truck is increased per sq foot of area, at a dramatic rate.

Lowering a vehicle helps in another way as well, less air under the the vehicle and less turbulence, and the bottom of our trucks is a nightmare for high speed.

I personally don't think lift would be a problem on these trucks. Side winds would be far more dangerous, so if you are playing with top speeds that would be a more important factor to me untill you are running 160 plus.

My stealth has a gps top speed of about 168 and lift started at 160 mph, when I lowered it 3 inches the top speed with to about 172 and lift was gone, took about another 60 hp to reach 178mph. It has a Cda of around .32 and frontal area of about 20sq feet. So my aerodynamic wall is around 170 mph, that is where the hp has to go up alot to gain speed. MY bike is around 190mph, I have not tested the truck so I really have no idea where the wall is.

Thats my take on it, Mark.

trik396

Mark, sounds crazy.... fun kinda crazy....

XLR8R

You guys pretty much hit all the nails on the head already!

Mark03Ram

Yah its a rush, I had to buy a new helmet to keep the buffering down. My scorpion is stable to 185 mph so far, fast as I have been on my bike. GPS is wonderful thing, its sobering to find out most speedo's are 7-10% fast, alot of guys say they have done this speed or that, but there usually 15 mph slower then they think. I have been looking at that Banks Dakota wow that is a super amazing truck. 220 plus and they drive it to the flats pulling a tailor hahah that is so un heard of