Buschur Racing aerodynamic testing...of sorts.

[David Buschur]

Last year I became interested in trying to clean up the way the air moves around my RS. I was hoping to help the car go faster by making it cut through the air more cleanly.

I built a front undertray, diffuser and front block off plates for the fascia (all of which are available btw). I also added a vortex generator after seeing some interesting testing on them. It seemed to help as the car had some killer MPH at the track, running 159.64 mph at 2985 pounds on an HTA86 at only 43 psi of peak boost.

I had found some videos and read some articles on wool tuft testing. This is a process where pieces of wool or yarn are attached to a car and then video taped to see how the air moves around the vehicle. I bought some bright orange yarn, grabbed a roll of tape and our video camera and figured I'd go make some video.

For now all I have done is the rear of the car. Rear window, deck lid, wing, back of trunk lid/bumper and the underside of the diffusers we build with the EVO9 JDM bumper.

My findings are the vortex generator absolutely without a doubt has to help the car. You can see in the videos it keeps the air attached to the entire rear window and trunk lid. The wing you can also see has nice air flow around it.

It also appears as though the back of the EVO is pretty well designed as there is very little air attached to the trunk, which I believe is good as it seems the air is making a clean break from the trunk and sides of the vehicle.

It is also nice to see the diffuser we built is working as the yarn is layed flat against it and then breaks nice and clean on the edge.

Something else you will notice is the rear windshield wiper for sure disrupts the air on the back of the car.

In a few of the videos you will notice a piece of yarn close to the camera moving all over the place, ignore that piece, the air is being disrupted from the camera mount.

Anyway, it was interesting to me so I thought I'd post it up for others to see. Just something else in the never ending quest to go faster and faster.

I want to do the hood, front fascia and the undertray next but need to get the time and motivation to get to it.

Here's the video. It's my first ever video, Jarrod added the hippie music for me. haha

http://videos.streetfire.net/video/B...ero_684440.htm

[bboypuertoroc]

Interesting testing. Thanks for sharing.

[yellowevo42]

not bad, the music was def weird..

[blackout]

Thanks for sharing the testing.

[vwjeff]

looks to me like the vortex and wing are best together?

[Nissan2Evo]

Thanks for the testing. Music was bad ass too

Looks like it's time for a vortex generator.

[SLVRNBLK]

Using the roads in Wakeman, Oh for your wind tunnel, nice! The music.......well, no comment

[steelcityevo]

Great test's David. People probably wonderin WTF is up with that car hahaha. I like the camera mounts.

How fast were you traveling on these test's Dave???

I hope Trent washed his hands after finger fuckin his asshole hhahaha

[johnboy1065]

Ya'll should make a kit to cleanly eliminate the rear wiper....I'd def buy one since my wiper motor stopped working lol

[project_skyline]

Ya'll should make a kit to cleanly eliminate the rear wiper....I'd def buy one since my wiper motor stopped working lol

+1

Good testing david.

[celica2evo]

there is a post on evoM to a company that sells plugs for the rear wiper delete. I ordered some and they work great. They snap into the hole and WILL NOT come out without pulling the hell out of them. A small amount of clear silicone on the inside of the plug and then stick it in and its seals perfect. Ill get the website and part number tomorrow.

[johnboy1065]

there is a post on evoM to a company that sells plugs for the rear wiper delete. I ordered some and they work great. They snap into the hole and WILL NOT come out without pulling the hell out of them. A small amount of clear silicone on the inside of the plug and then stick it in and its seals perfect. Ill get the website and part number tomorrow.

hell, I had no idea about that....thanks for the info, I'll search and try and find that.

[bullmannn]

I think it is this place that Celica is referring to: http://www.harmancorp.com/products/p...tyleplugs.aspx

The number is ZZS1418-2P018 but they don't seem to have that one anymore

But in a evoM thread about the subject at hand said it's a 2 5/8 plug

[mini_squared]

Something else I had considered doing for the rear wiper delete is getting a regular Lancer rear window. YES... I know it is a expensive and might not make a lot of sense but this way you never have to worry about the plug leaking or shrinking in the cold.

Dan

[David Buschur]

This is an old thread but good information.

I wanted to post a picture of Simon Norris' short wheel base EVO9 at just short of 200 mph. Check out the factory rear wing on this car and how much down force is must be producing:

[crcain]

Cool pic! That is some serious flex.

[06MREvo]

This is an old thread but good information.

I wanted to post a picture of Simon Norris' short wheel base EVO9 at just short of 200 mph. Check out the factory rear wing on this car and how much down force is must be producing:

Holy shit!! Nice find DB...that is ridiculous...I wonder how much faster he would have to go for it to crack/break...