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Underbody Aerodynamics

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Old Mar 13, 2009 | 10:04 AM
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Default Underbody Aerodynamics


I started the thread in S2000 Talk - but with minimal response. Hoping for a more direct answer here.

http://www.scienceofspeed.com/produc...tray_diffuser/

Thats the product I'm curious about - also a long thread here: https://www.s2ki.com/forums/index.php?showtopic=601484 but that doesn't have much more than a never ending sales pitch for the CF piece.

Does anyone has personal experience with this on a street car?
Can you explain the benefits you've experienced (if any). increase mpg, better manners at highway+ speeds?

I know its an expensive piece, but I'm looking for a wheels+tires+suspension addition to keep the car stuck to the ground and curious if this is truly beneficial.

Also, any heat issues?
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Old Mar 13, 2009 | 10:31 AM
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Honestly, I don't think you're going to get a lot of feedback, because very few people are going to shell out $3k+ for a fancy CF piece that goes under the car.

The physics for creating downforce from a flat underbody panel are relatively straightfoward (Bernouli's principle). Moving air between two flat surfaces creates a low pressure zone. However, to make this truly useful, you really need to be skimming the pavement and traveling at very high speeds (think formula 1 cars as a great example). On a street car at a typical ride height and legal speeds, the effect is going to be negligible.
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Old Mar 13, 2009 | 10:49 AM
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^well said... unless you track it all the time, it's an utter waste other than the bling factor your technician will get when he puts the car on a lift.
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Old Mar 13, 2009 | 10:52 AM
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HAHAH. OK, thanks guys. I wasn't super serious about it, but now I'll focus the $3000 elsewhere.

It does look cool though. but not as cool as 30 hundred dollar bills
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Old Mar 13, 2009 | 10:58 AM
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get ready for the sales pitch in here too
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Old Mar 13, 2009 | 12:38 PM
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Originally Posted by jeffbrig,Mar 13 2009, 10:31 AM
Honestly, I don't think you're going to get a lot of feedback, because very few people are going to shell out $3k+ for a fancy CF piece that goes under the car.

The physics for creating downforce from a flat underbody panel are relatively straightfoward (Bernouli's principle). Moving air between two flat surfaces creates a low pressure zone. However, to make this truly useful, you really need to be skimming the pavement and traveling at very high speeds (think formula 1 cars as a great example). On a street car at a typical ride height and legal speeds, the effect is going to be negligible.

I agree 100%
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