Improving the under-car aerodynamics, Sedan.

[gclark8]

I am not having much luck mastering the multi quote feature, so here goes:

FASTRAKR, I must get one of those Automotive Computers and join you in the experiment.

petrified.rabbit, Yes the DS23 had everything under the bonnet, wheel, bipod etc..
Summer days here can be extremely hot, aircon is essential.
It you try a pan under the engine, I suggest monitoring the air pressure near the engine air intake. I would be concerned about starving the motor of air.

Daox, the air over the top must rejoin the air under the bottom, the smoother this happens, the less turbulance and less drag.

[daug1502]

It should be pretty easy to not starve the air from the motor. Most of it comes in from the fender/wheel wells and not directly from the engine compartment. Unless you are running an SRI, but that should be cheap enough to switch to cold air.

As for the engine bay air flow, could you not cut vents into the under pan? have them set to let the air out of the engine bay and toward the rear of the car?

[MJP92284]

I read into this a bit ago. Im in Iraq right now, but when I get back, Im going to custom make a front splitter and skid plate. I did a fair amount of research, and the front splitter increases undercar airspeed, so that would help with the cooling. It also drops the undercar pressure, so it helps with aerodynamics and sticks it to the ground. Just an idea.

[gclark8]

I read into this a bit ago. Im in Iraq right now, but when I get back, Im going to custom make a front splitter and skid plate. I did a fair amount of research, and the front splitter increases undercar airspeed, so that would help with the cooling. It also drops the undercar pressure, so it helps with aerodynamics and sticks it to the ground. Just an idea.

Sounds good. I would like to see some splitter designs, maybe 2-3mm alloy under and in front of the skirt.
Like this one: http://www.mgf.ultimatemg.com/group2...rodynamics.htm

Have you seen the under-body stuff done by Skoda to improve economy in their small car?

[FASTRAKR]

Is a splitter going to work for the Aveo? the way our bumper comes up at the front I would think if we put a splitter/belly pan it might induce lift in the front.

[petrified.rabbit]

It's the overall path of the car. From the pout where the splitter separates the air to where those two air paths meet would determine lift, since under the car is shorter/faster that over then car. It should produce downward force.

The splitter for efficiency I believe is used to cut turbulence. Which it will help as well.

[MJP92284]

Yes. A splitter forces air under the car at a much faster pace, and flows extra air above the car. The fast speed of the under car air speed, creates a low pressure zone. added with the incresed pressure on top of the car, and you have a better aerodynamic vehicle

[FASTRAKR]

But if you just add a flat plate to the bottom surface of our cars it will be sitting at a 15 degree angle to the ground (roughly). Wouldn't that induce front lift? My understanding is a splitter needs to be parrallel to ground to work so we would need to put some sort spacer front center to bring it down to the level at the front of the wheel well opening.

[gclark8]

Did you follow the link above to? The English Fantasy: Smith and Deakin Spoiler fitted

The Carbon Fiber splitter is what I am aiming for, in aluminum, parallel to the ground.

[petrified.rabbit]

i would probably mount the splitter to the rad support lower cross brace, and not to the bumper. if it is aluminum or carbon fiber, there is no reason that that length would be an issue. and it would be mounted to a flat area of the car.