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Old 04-13-2014, 04:29 PM   #1
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Down force for the backend

Ok, folks, so here's the question. I've searched around the forums and can't find what I'm looking for. I want to smooth the bottom of my car - literally aluminum sheet the underside then add an Indy style splitter (narrow opening towards front of the car then widening as it approaches the rear). From my research, this should be the most effective means of creating downforce on the backend.

Has anyone tried this? What effects did it have and what speeds did you have to reach for the effects to be noticeable?

Thanks all!!
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Old 04-14-2014, 09:33 AM   #2
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Are you planning on running endurance racing? That's the only way you'll see any significant advantage, even if you can pull this off.

Vehicle aerodynamics are as close to a black art as any science can get. companies spend millions in wind tunnels, etc. to work out tiny details of this. I kind of doubt just slapping some sheetmetal on the bottom is going to work and may well cause other consequences like overheating, etc.

whatever you do to the bottom, the car's still a barn door up top, with a huge gulping grille and rather large frontal area for size.
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Old 04-14-2014, 12:24 PM   #3
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Underpanel will not create downforce in the rear, it will however increase aerodynamics/wind velocity.

That being said, albeit rare, look up cars being flipped 30 feet in the air from a flat panel underbody.
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Old 04-14-2014, 07:26 PM   #4
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A good splitter, side skirts, and rear spoiler should do the trick. Take a look at www.mustangrtr.com/2013-spec-two.php
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Old 04-15-2014, 11:13 AM   #5
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Question and thoughts..

Maybe I am wrong but ( just a thought) ,
To keep out airflow under the car you would need to block all air movement that could cause EXTRA friction (create a more common airflow and block off dead zones the air could go to), wouldn't that be bad for a daily driver?
No air movement (or a lot less) would cause not cooling off of Tranny, the rear end, and not to mention the air through the engine bay which of course could create other issues of drag due to air flow and so on..
I do know the Rear ends don’t rely on cooling but they do need release heat (Heat dissipation) and when you cover them up they can't. So there for the temp will rise and break down the oil faster. I would think on a car used for racing, that issue is minimal due to the changing and checking of gears and rear end oil more often anyway.

Just my thought process I don’t know if I am all that correct. Heck look at the problems they are having with the new (Green efficient) homes. They are now so good at stopping heat and cooling loss they are finding out they have closed off air flow and it is creating problems like carbon monoxide build up. Because it won’t let it escape either..
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Old 04-15-2014, 06:24 PM   #6
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Look at a Lotus Elise for ideas on how to do it right. The cooling ducts should be planned for if you will try to do this.
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Old 04-15-2014, 08:35 PM   #7
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Downforce is negligible until well over 100 mph or so.


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Old 04-15-2014, 08:50 PM   #8
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Quote:
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Downforce is negligible until well over 100 mph or so.


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+1 more like 180 mph lol
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Old 04-16-2014, 08:53 AM   #10
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Quote:
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+1 more like 180 mph lol

Don't tell ricers that haha
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