Flibbie Posted May 13, 2009 Share Posted May 13, 2009 Effects are questionable at my cruising speeds but I like the looks. Jim Link to comment Share on other sites More sharing options...
Spaz Posted May 13, 2009 Share Posted May 13, 2009 That looks very cool, but it you need mroe down force, just hook up the trailer Link to comment Share on other sites More sharing options...
Hank Posted May 13, 2009 Share Posted May 13, 2009 Oh come on, you can't just provide 1 picture! I want to see a lot more than that! Any pics showing how far you went in? What material? Any angle of attack from the start of the diffuser to the back of the car? Link to comment Share on other sites More sharing options...
Flibbie Posted May 13, 2009 Author Share Posted May 13, 2009 Hank, I'll try to get my son to get some better pics maybe with a flash. The diffusers start at the frame member that runs across behind the seats. I put a floor up under the rear and the diffusers are attached to it. Material is scraps of ali left over from other body mods. Anodized dark blue. Jim Link to comment Share on other sites More sharing options...
Flibbie Posted May 13, 2009 Author Share Posted May 13, 2009 (edited) Hank, The front of the diffusers extend about 3/4" below the floor pan in front. That leaves me about 5" of ground clearance. At the rear they extend 4" below the floor pan and leave about 6-7" of clearance. They are 2' long. The angle between the floor and the trunk floor is 10-12 degrees kick-up. These pics are on the right side. Jim Edited May 13, 2009 by Flibbie Link to comment Share on other sites More sharing options...
Flibbie Posted May 13, 2009 Author Share Posted May 13, 2009 The left side is mirror image of right side. Jim Link to comment Share on other sites More sharing options...
Hank Posted May 13, 2009 Share Posted May 13, 2009 Beautiful job, Jim. If you are truly concerned with aerodynamics I'm told the proper angle is 5 degrees upward from the front of the diffuser to the rear. They mentioned the 5 degree angle is good until 175mph. Anything above that and the angle changes for the salt flat guys (typically the only people to take advantage of it). I hope to get around doing this soon. Link to comment Share on other sites More sharing options...
jlumba81 Posted May 14, 2009 Share Posted May 14, 2009 Did you also make a undertray for the engine compartment or just the rear? Link to comment Share on other sites More sharing options...
Flibbie Posted May 14, 2009 Author Share Posted May 14, 2009 The floor of the trunk was covered to allow for future baggage area. The diffusers were added just for looks. I've seen 120mph once. As I use back roads, 55-65 is perfect for me. The front has undertrays on both sides of the engine. As the engine and bellhousing extend beneath the frame they are not covered. Jim Link to comment Share on other sites More sharing options...
rotus8guy Posted May 14, 2009 Share Posted May 14, 2009 Downforce, maybe? But who cares, they look great! Nice idea. jb Link to comment Share on other sites More sharing options...
jlumba81 Posted May 14, 2009 Share Posted May 14, 2009 Does the front undertray affect engine cooling? I was considering an undertray when I get my 7 build underway as to help get a some downforce and maybe help w/ the drag. Might help keep a cleaner engine bay too by keeping rocks from bouncing up. Is the driveshaft also covered up? Link to comment Share on other sites More sharing options...
Croc Posted May 14, 2009 Share Posted May 14, 2009 That really looks nicely done. At what speed does a diffuser begin to have some effect? Have you noticed anything from your casual drives? Link to comment Share on other sites More sharing options...
Flibbie Posted May 14, 2009 Author Share Posted May 14, 2009 Jlumba81, I don't know if the engine bay undertray sides effect cooling or not. I removed the side panels (the panels around the headers) when it got hot down here about a month ago.I had considered covering the driveshaft but decided against it. The problem I see is that dirt and water can still get in at the front of the transmission tunnel. I'll try to post pics to explain better. Croc, My guess is diffusers start to effect downforce around 90-100. However, to notice a difference, I'd bet 150+ in needed. I've read the Elise diffusers contribute 4lb downforce. However, they never mentioned at what speed. I never expect to see any effect. I just like the looks. Jim Link to comment Share on other sites More sharing options...
7evin Posted May 20, 2009 Share Posted May 20, 2009 Beautiful job.... Since most people will be looking at the back trying to keep up .. Cheers 7 Link to comment Share on other sites More sharing options...
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