I think this would be the best place to put this thread. If not, please move it.


I've been looking into front undertrays and rear diffusers a bit and was wondering if anyone has designed any of their own from scratch? The front undertray seems easy enough to think up and install, but the rear seems to be a bit tougher. How would you know what the best angle is for the slope? Also, how to make sure air is not getting split and trapped up in between the bumper and the diffuser (this question goes along with the slope question since that would determine the speed of the air).

I understand a good amount concerning aerodynamics, but i have no degree in anything, so help is appreciated.

Also, would there be a benefit of a full / partial underbody pannel system on an evo?


Thanks

 

I designed undertray / front splitter with the help of CarbonWorks... I will be picking it up this weekend

will post pics once installed and widebody kit is installed and painted...

working on a rear diffuser...

 

Would be intrested to see as well.

 

No problem...pics coming

unfortunately the rear diffuser will only fit the CWEST rear bumper setup

 

pics?

 

I think the primary goal would be just to get a nice smooth underbody. That by itself would probably be a huge improvement over stock. As far as the rear diffuser goes, I really like Vishnu's design, since it features adjustable slats. Again, though, even a flat piece of CF or aluminum as a rear diffuser would already be an improvement, since it would eliminate the parachute effect of the rear bumper at high speeds (>120mph).

l8r)

 

post up pictures

 

Here are some pics of my diffuser that I took a long time ago






oh and here's another view too

 

the most important thing with the rear diffuser is the choke point for the air...

where the diffuser starts to angle up makes a significant difference in the downforce.

cb

 

so your verdict on this piece is...

 

Talentsearch: did you get the front undertray yet and install it? Pics and comments would be nice.

a web search did show a flat aluminum panel undertray for $300 Had slats.

Not sure how that would work aerdynamically.

Milburn

 

On a diffuser I wouldn't go anymore than 12-15 degrees from level but the speed you are driving it will determine how long the flow stays attached to the surface.

*fixed*

 

WOW 25 degrees is a LOT

 

yeah, ignore that, it shold read 12-15 deg, I was remembering wrong numbers, lol
I'm pretty sure that was the max angle computed between the chordline and upper trailing edge of the wing for my senior design project. Thanks for the sanity check

 

just interesting info on underbody areo... when i had training for the new e60 m5, we learned that the design of the front to mid under tray frees up 16kw at
120mph. so thats 16x1.34 = 21.5 hp pretty neat!

well there is some fact to help drive you idea good luck im subscribed