office888

First off, i'd like to state this is NOT a cosmetic debate. I'm after sheer <U>PERFORMANCE</U> , not the LOOK of the ability to go fast.

I'd also like to state that I already know somewhat how to work with carbon-fiber. My speciality is really fiberglass, but they go hand in hand.
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Well, My CRX project has been progressing well and i've been interested in a few things. The main things i'm building my CRX for is for drag, and top speed.

The CRX itself seems pretty aerodynamically set. The front windshield is at a fair steep angle, and the rear window slopes an angle that would cause very little vacuum in the rear.

My questions are the following:

Front End:

Would anyone know a bit about tuning the front end a little better? I've been contemplating with fabricating a piece of carbon-fiber to use as a front spoiler. Would anyone have a guess on how much of a slant to put on the spoiler, and how long do I make it?

Rear End:
From what i've heard, a majority of drag is caused by the rear bumper. Just like with the front end, i've been playing with the possibility of creating a TAITEC-style rear diffuser out of carbon-fiber as well. The only i've been stuck up on the a wing. What height should the wing itself be? What slant should it be at as well? I've also considered using the spoiler in conjunction with roof-mounted Vortex generators, much like the EVO.

I'm after maximum traction at over 100 mph speeds.

SIred91

you totaly picked the wrong car to go high speeding around in. enough said.

office888

Aha, but you're wrong.

Honda CRX has less coefficient drag than a Lamborghini Diablo.

Downforce is another issue...obviously some of that cof. drag. would be sacrificed to gain a little traction and planting to the tarmac instead.

# 5.10 - 1999 Honda Insight
# 5.71 - 1990 Honda CR-X Si
# 5.76 - 1968 Toyota 2000GT
# 5.80 - 1986 Toyota MR2
# 5.81 - 1989 Mitsubishi Eclipse GSX
# 5.88 - 1990 Nissan 240SX
# 5.92 - 1994 Porsche 911 Speedster
# 5.95 - 1990 Mazda RX7
# 6.00 - 1970 Lamborghini Miura
# 6.13 - 1993 Acura NSX
# 6.17 - 1995 Lamborghini Diablo

http://en.wikipedia.org/wiki/Drag_coefficient

Yes, the Honda Insight has the least amount recorded yet. =P

sanimalp

down force wont help your top speed.. first of all. most of your problems cannot be solved unless you have a wind tunnel or are really good at differential equations involving fluid systems.. and.. ahem, why would you want a wing on your car.. unless it is on the hood, which would look pretty goofy.

if you want maximum traction, get some stiff springs for the back that add a little in height.. that should tip your car forward, thereby shifting the center of gravity forward a bit. it will also rotate the body of your car longitudinally forward, thus raising the angle of attack http://en.wikipedia.org/wiki/Angle_of_attack of the of the hood, giving you more down force where you need it.. over the front wheels. and then you wont need to buy a wing..

djphonics

Keep in mind the CRX has a very short wheelbase, which will sacrafice some stability at very high speeds.