Quote:
Originally Posted by 92GTA
Yes, I currently have his 69 Firebird spoiler. I'm looking for something more effective for aero though.
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If this is what you're after, Copy what Big Red Camaro is doing.
The factory style chin spoiler is functional and the first gen F-Body in general was one of the first cars GM developed with a nod to aerodynamics.
What you don't want on these cars is the rear spoiler without the front chin spoiler. That's a bad combination at high speed.
What BRC is doing is utilizing the basic design of the camaro style spoiler and putting it on steroids.
You probably want to find one of these as either an aluminum reproduction, or carbon fiber. Just something that has a bit more strength to it than the flimsy plastic that they typically come in.
From there you want a protruding splitter to the tune of about an inch and a half, attached to the lower portion of the spoiler. This is also an area that you can use for turnbuckle bracing. The factory mounting points are adequate for the stock type spoiler, but adding significantly more downforce, you want more attachment points as nothing down there is "structural."
That splitter you want to carry back as flat as possible, as far back as possible.
After that, you want to close out the sides and fill the space up to the fenders, towards the wheel arches. All of this helps direct the airflow to make the best use of that chin spoiler's design.
The pictures you find around of big red currently show those close outs as being pretty flat. They've recently changed them though as their wind tunnel testing showed that having a compound curve outward, then back in towards the fender produced better aerodynamics.
There's a bit of fabrication going on there, but nothing too crazy if you know how to transfer cardboard templates to aluminum and have access to a sheer. I'd cherry rivet the whole thing.
If you want to go further, extend out the splitter to include gurney flaps on the leading edge of the wheel wells.