I have seen these little rear air diffusers on the rear of some cars and I think 2 or 3 on the rear of cars with the Stillen body kit might look really sharp. Maybe even cars without the body kit too.

Here are pics are a 2007 Kia Rio SX Concept that shows what Im talking about.




Ignore the fugly car its on. If anyone can photochop this on to the back of my car just to see, that would be great.

Here is a pic you can use:


Any thoughts, good or bad??

 

This car is closer in design to our lower rear - the Audi TT-R
http://www.rsportscars.com/foto/10/ttr07_04.jpg

 

i don't know it looks good buh i think it might starting to push the ricey level...might just be my opinion cause it really doesn't serve any performance purpposes...lolxz

 

Actually it does serve significant performance purposes. Here is what the rear diffusers on a Ferrari Callenge Car do: According to Ferrari factory specifications for the Challenge Stradale, these diffusers (underbody spoilers) substantially increase negative lift (downforce) and provide improved stability at speed. And here is a Subaru site with info on diffusers:

http://www.aprperformance.com/index....d=69&Itemid=47

Im sure this is for higher speeds, but the same can be`said for rear spoilers; they dont work at high speed but they are really for style. I think if it is tastefully done, it would not be ricey. If they are body colored, or maybe black on any car, and not to large, they would add a bit of aggression to the otherwise plain rear.

 

i have always wanted to do this to my car........

 

More ideas/examples:
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PM larrio. i believe him and andy make them in CF. andy has one on his 4th gen

 

Nice man im up for it ...

 

That would efinately look nice, or maybe bluebat could make one thats just black like the 07's

Heres one for the altimas...

 

here ya go. Click on pics to enlarge.

 

Looks tastefully done, but this mod can definitely go from tasteful to rice pretty easily.

 

I make those for the g35 coupes and sedans as well . I'd be down if I get a volunteer .

Bat™

 

OOOh, hotness. Looks sharp. I can see how it could go ricey but that chop looks really sharp Illanoiz. Thanks, nice job with the chop

 

Actually it does serve significant performance purposes. Here is what the rear diffusers on a Ferrari Callenge Car do: According to Ferrari factory specifications for the Challenge Stradale, these diffusers (underbody spoilers) substantially increase negative lift (downforce) and provide improved stability at speed. And here is a Subaru site with info on diffusers:

http://www.aprperformance.com/index....d=69&Itemid=47

Im sure this is for higher speeds, but the same can be`said for rear spoilers; they dont work at high speed but they are really for style. I think if it is tastefully done, it would not be ricey. If they are body colored, or maybe black on any car, and not to large, they would add a bit of aggression to the otherwise plain rear.

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Last edited by DeusExMaxima : Today at 01:54 AM.
Take an air drag measurement on all these devices that fight air flow from the other direction. It all equals out to be drag. Get your front down with spoilers and you don't have to worry about the *** end. Nascar, Indy and Top Fuel dragsters have rear wings but they are going 190, 240, 330MPH. I be willing to bet you're not this fast. Any car can benefit from front downforce to help keep it one the road but unless the car has ****-poor design, or you can reach the above mentioned speeds you really don't need to waste your money, unless it is all for looks. Which there is nothing wrong with. I love a car the looks good, nice body lines. etc. Not all cars have to profess to be race cars just because you have modified them in some way.

 

I don't like it they are not sporty enough! They look like alot of other factory valances.

 

Any suggestions for other designs? I saw a few others, but I felt this was the nicest design in terms of aggressive versus being too ricey.

 

I too have thought long about this... was lobbying for it to be implemented in a certain rear bumper that never saw daylight.

Bat, would this be an addition, or modification, or replacement?

 

most likely in addition. Can I get a better shot of the stock rear bumper?

Bat™

 

Here is mine many moons ago:

 

andy i am going to be calling you tomorrow ... hope we can work something out

 

BlueBat's idea goes on par with mine (using vinyl) but I was kind of afraid that it'll look like pontiacs. I guess its time to try it.

BTW. That photochop for DEUS look amazing.

 

can someone flip this over and put it on my car?

 

Im trying to figure out how to make the lower diffusers like in the photochop pic. I'd like to see a silver max with the same tail light treatment as in the photochop except make the lines silver (body color)

 

VIP, That would look nice.

 

its for an STI. when i look at it, its way too long. i think the best way is to cutt off the section that has the exhaust hole and then cut off the one all the way to the right to fit the exhaust.

you can most likely use this one too. just cut a hole on the other side.

 

Dude, you got a pimp shine on your max, very nice. You hand polish and wax it yourself or did God just bless you with it?

 

Yes it would definitely look nice, but you can't necessarily relate the ferrari challenge cars to the maximas. Yes the diffusers will improve airflow under the body of the car and such, but the aerodynamic gain isn't worth the money unless you smooth the entire underbody of the car, which if you do incorrectly will actually provide lift and make the car unstable at high speed.

it all depends if you want to do it right (non-rice) or half *** it and rice it.

 

seeing this makes me want to actually get the 6th gen maxima....but I like not having a loan

 

here ya go. click on pic

 

lol thanks but i just wanted it to cover the middle ! not overlap my stillen rears

 

VIP, looks good on ur ride!!!

 

I like the pic that Illanoiz made so Ill probably make something very close to it.

 

Here is a clear pic of a rear diffuser on a Renault Clio?


If you guys can find a rear diffuser at a reasonable price, ill buy it and modify it.

 

never got a call .

Bat™

 

I don't have a Ph. D in fluids, but I can tell you that the diffuser has to "reach" back into the car a few feet to do anything. You need to control a certain amount of air under the car to produce downforce. It needs some walls on the left and right and needs to slope upward.

The photoshopped pic of Dues' car earlier in thread shows a very poor example of how to make a diffuser. That one would be just for show. I know we are just trying to get a feel for how it looks, but you know .

Look at the underside of race cars, like F1. I think the F1 site shows some general pics of this.

 

I agree to some extent. I think most of the diffusers on street cars are for show, much like spoilers and other ground effects too. If they were effective, it would only be at highly illegal speeds, maybe speeds of 100 mph and greater. The technical proper effect of a rear diffuser is to evacuate air from under the car into the high pressure zone outside the car, thus creating a "sucking" effect and providing stability and traction, especially at high speeds.

If you are looking for a functional diffuser, it would look rather cumbersome on our cars I believe. There may be a minimal effect with the smaller diffusers, I dont know either. My doctorate degree isnt in fluids either. For me, I like the look, and if I get a bit of smoother air flowing out from under my car, then all the better.

 

Talked to you on the phone and sent you a "PM"

im excitee to meet u p w/ you tomorrow..


I will keep everyone posted .. .. . . .

 

I made some mock-ups to see how it would look. Tell me what you think:

 

damm deus i feel so proud ur actually doin a mock up of the chop.
It just proves anything is possible if u put ya mind too it. Damm keep me informed on how it turns out.

 

I made the mock ups out of cardboard and then painted it black. I followed the curve of the piece next to the muffler. Now I have to figure out what material to make the actual pieces and how to attach them. THATS the hard part. Im up for suggestions.