Wangan aero: reducing coefficient of drag and lift, increasing downforce?

[Black R]

I have an s13 pignose coupe, and have been noticing how my mileage decreases when the headlights are up.

That got me thinking about aero and what I'd like to do to make the car more stable at triple digit speeds, as well as more efficient accelerating to that point.

I did a little googling and found Cd of .30-.31 for the s13 pignose.

What's the Cd for the jdm s13?

What other options do we have to help the car cut through the air and yet remain stable and handle better?

I posted something similar on a local forum and got this interesting link:

http://texasnissans.com/tx/forums/showthread.php?p=137167

I have a bodykit I may put on to see if it helps, but what options are there for better aero headlights? Is the jdm Silvia front end better aerodynamically? S13/s14/s15?

I also remembered reading about the rocket bunny cars and how they were set up for wangan (highway racing).

http://www.tra-kyoto.com/6666/s13/s13.htm

Interesting that they use the s13 front end.

[WorkInProgressK]

Well, they all share similar frontal area. The difference between the pignose(closed lights) and the silvia are pretty minute. I would say, the CD is lower on the 240sx during the day and night its the Silvia :P.

The rocket bunny cars are pretty much built like Nascars. The rear wing adds some downforce(-CL) but more CD.

The whole area of the wing is a huge air stall area. Its not necessarily bad, because it add rear stability, since the rear is always being pulled because of drag.

For aftermaket body panels, unless you have side skirts the front and back barely have any effects.(we are not talking about rocket ish looking bumpers).

Side skirts keeps and directs the air flow under the car and prevents the air from bleeding away.

Front=splitter, rear= defuser again both to direct the air flow.

[Sleepy_Steve]

Flat bottom?

[Black R]

Flat bottom?

Yes.

As I understand it, this will help with anti-lift.