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Old 07-28-2011, 03:46 PM   #1
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Default Tumbling further down the rabbit hole...

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.













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Old 07-28-2011, 07:00 PM   #2
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It must be a pain getting groceries in the trunk with that on there.
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Old 07-29-2011, 04:56 AM   #3
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yeah, because I use this car to go get groceries...
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Old 07-29-2011, 05:34 AM   #4
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Old 07-29-2011, 10:02 AM   #5
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Quote:
Originally Posted by ThePass View Post
yeah, because I use this car to go get groceries...
Forgot the .

Have you tried it out yet?
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Old 07-29-2011, 10:07 AM   #6
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Have you considered adding side plates to increase the effect by cutting spillover at each end?
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Old 07-29-2011, 03:47 PM   #7
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Quote:
Originally Posted by sjmarcy View Post
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.
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Old 08-02-2011, 02:35 PM   #8
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Quote:
Originally Posted by inferno94 View Post
Forgot the .

Have you tried it out yet?
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.

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yeah, because I use this car to go get groceries...
Totally viable.
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Old 08-02-2011, 03:12 PM   #9
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I thought the rules stated that the trunk must remain functional, as in being able to open and close with the spoiler attached.
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Old 08-02-2011, 04:04 PM   #10
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Quote:
Originally Posted by Doppelgänger View Post
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
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Old 08-02-2011, 05:11 PM   #11
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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.
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Old 08-03-2011, 12:11 AM   #12
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Can you send me some pics of that exhaust? I wanna czech it out.

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Someone sounds JELLY OF THE SICK WING
homes needs some toast to go with that jelly
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Old 08-06-2011, 07:18 PM   #13
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Quote:
Originally Posted by Doppelgänger View Post
I thought the rules stated that the trunk must remain functional, as in being able to open and close with the spoiler attached.
Don't know what you're talking about - I make my own rules
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