This is mainly for auto-x use, and is completely removable. I've been playing cat n mouse with the fastest cars at the BMWCCA auto-x down here, most of them are on race rubber - last event I was 0.2 sec off of Brian Goodwin in his stripped/supercharged/R-comp NC, and I've taken it upon myself a bit of a quest to see how fast I can make the car on street rubber as the underdog... the tail gets pretty happy on corner exits and I felt the thing holding me back the most at the last event was having to stay really light footed on corner exit..

So I made myself some rear downforce. I turned to Moti for initial ideas since he has used such a spoiler with great results back in the day, and went from there.

Details: Built with a dremel, drill, and manual rivet tool. Made from 6mm alumalite since I have tons left over from my front splitter project, the brackets are all 1/8" aluminum that I cut from bar stock and shaped with the dremel. The struts I pieced together using 5/16" threaded rod, heim joint ends, nuts and brass tubing as a sheath around the threaded rod. Joins to the bumper with hinges so the angle can be changed. Currently at 45*

It's not the prettiest thing, but I made it myself for pretty cheap and it should work. Will be trying it out on August 13 at the next autocross. All those on R-comps, I'm coming for you.

 

It must be a pain getting groceries in the trunk with that on there.

 

yeah, because I use this car to go get groceries...

 

 

Forgot the .

Have you tried it out yet?

 

Have you considered adding side plates to increase the effect by cutting spillover at each end?

 

I hadn't thought of that, I like that idea. I'll see how I like the feel of it and I'll play with the angle at the next event and then might consider adding something like that to see how much that helps/changes things.

 

I drove the car at a clinic I was instructing at just to play around on my recon laps and compared to the last event where I had some seat time I noticed a major increase of stability and traction at speed.

Totally viable.

 

I thought the rules stated that the trunk must remain functional, as in being able to open and close with the spoiler attached.

 

Someone sounds JELLY OF THE SICK WING

 

Most of the top CSP miatas use a similar spoiler out of plexiglass that's curved a bit more. I'm sure you can find photos over on one of the the other Miata forums under the autocross section.

 

Can you send me some pics of that exhaust? I wanna czech it out.

homes needs some toast to go with that jelly

 

Don't know what you're talking about - I make my own rules