GrantB

Katz's book on aerodynamics has convinced me of the merits of deck-lid spoilers. Can anyone recommend an one? I'm thinking around 1" to 2" in height (which may not even add drag to the car) would work well, though I'm not sure if there if any way to know without wind tunnel testing?

I'm hesitant to pay $700 for something I could make myself for far less, though I'd be willing to spend more if it actually made the car look better (I'm expecting most functional spoilers to be hideous).

I don't want to mess with wings or anything too serious, since I already have a car with significant downforce. My C5 isn't my primary track car, but I'd like a bit of high-speed understeer to keep me off the wall.

Thanks for any help.

97C5inSD

I'd consider a specterworks rear fascia or a ACP rear fascia they have like a duck tail that replaces your rear fascia already and has it built right in so it dosen't looke like you added it or if you did your body man did a awesome job at molding it in.

I have a Spoiler from MSI that is bolted on it's similar to one Craviago and ACI sell. but theres are Stick on i wanted one that was firmly attachted. Fit and finish isn't bad and took minimal body work to match up well.

davidfarmer

you can get an aluminum "brake" from harbor freight and bend one up for next to nothing. Depending on your skill and patience, you can make it look as nice as you want.

Spoiler are certainly effective, but are much less effective than wings. If you just want to stabilize the rear a bit, then you'll be happy. If you ever do any frontal aero work (splitter, vented hood, etc), then you'll need a wing. Spoiler generate more drag and less downforce than wings, in general. However, spoilers stack air over the entire rear of the car, spreading the downforce across the entire car, instead of just direct to the mounting point (like a wing would). In other words, a spoiler can add small amounts of downforce to the entire car, whereas a wing behind the axle will actually cause lift on the front of the car (due to leverage).

GrantB

I have no fab skillz. Anything I make will look hideous.

The most aero work I'd do to the front is a vented hood.

97C5inSD, I wanted to avoid buying an entire rear fascia. The gains aren't worth that much to me.

RAFTRACER

This is what I ran on my car until I did the front of the car and a wing.





I may have an extra that I could sell. Mounts to where the rear facia mount under the deck lid. You have to had a couple of holes on that ledge to add more support.

Definitely made an improvement in rear stability. Lexan helps so that you can see through it with the rearview. The lexan piece is the easy part to make and can be made in various hieghts to change how much force is being made. The mulit-contoured aluminum channel that the lexan bolts to is a real PITA to make and where most of the time is consumed.

sperkins

Did anyone else see the rear wing on Amy Rumans GT1 car at the SCCA nationals snap off the car? As soon as the wing left, it (the car) rotated and did a couple of 360's. Pretty cool to watch the affects (or lack thereof) of rear downforce. It must be tremendous.

spazegun2213

Any video of this?

GettReal

Similiar to the ACI/MSI. I have the Caravaggio one that is stuck on using 3m industrial tape. Been on there 5 years and its NOT going anywhere... tested all the way up to as fast as my car goes

I also have the Caravaggio small front canards, not that these ones do a ton, but I believe being on the front and back they do just what you might want at really high speed. Heres a side view

sperkins

I looked earlier, but didn't find anything. I had it recorded on my DVR and watched it last night. It was a great race with a Corvette beating a Mustang by .009 sec. at the line.

GrantB

RAFTRACER, thanks for the info, but I was looking for something more presentable and less aggressive. My FRC isn't a serious track car, as I have a Viper for that.

I shot an email to ACP, but they haven't responded yet.

Thats a relief; I'd hate to get a stick-on spoiler and have it fly off at 170. Any idea what the length of the Caravaggio unit is? It looks to be at about 45 degrees?

John Shiels

If you want it to do anything you can easily research (google) the angles used by NASCAR found to be optimal. IT is more like RR spoiler or the same vs. the one more for looks like the Carravagio one.


http://www.circletrack.com/techartic...ler_angle.html


last paragraph first page

Lan.Jet

Excellent article John! Thanks

John Shiels

I remember many years ago guy on TV said internet will change the way the world works, and I laughed.:o:o:o Now if you can think it you can google it. Any item any place.