Buschur Racing aerodynamic testing...of sorts.
May 26, 2009, 05:54 PM
#16
evodan, sorry, missed the part about the holes. No interest to be honest, it's a **** poor solution and ugly. The best way to fix the problem is to eliminate the problem, putting the diffuser on the car gets rid of I'd say 90% of the air that gets trapped in that bumper cover in the first place. Our diffuser lays flat to the rear diff and then has breaks in it to further catch the air that would travel over it by the control arms. You can see that the air is travelling nicely under the car by the way the yarn lays flat. You can also see that there is a low pressure area inside the rear bumper area from the yarn being sucked into it. It appears to me it is working very good, not that I am very smart in this area, just done some reading and such.
There are only a few guys on this board I'd put any faith in what they think of all this and one of them probably won't chime in here.
There are only a few guys on this board I'd put any faith in what they think of all this and one of them probably won't chime in here.
May 26, 2009, 06:00 PM
#18
evodan, sorry, missed the part about the holes. No interest to be honest, it's a **** poor solution and ugly. The best way to fix the problem is to eliminate the problem, putting the diffuser on the car gets rid of I'd say 90% of the air that gets trapped in that bumper cover in the first place. Our diffuser lays flat to the rear diff and then has breaks in it to further catch the air that would travel over it by the control arms. You can see that the air is travelling nicely under the car by the way the yarn lays flat. You can also see that there is a low pressure area inside the rear bumper area from the yarn being sucked into it. It appears to me it is working very good, not that I am very smart in this area, just done some reading and such.
There are only a few guys on this board I'd put any faith in what they think of all this and one of them probably won't chime in here.
There are only a few guys on this board I'd put any faith in what they think of all this and one of them probably won't chime in here.
Never new that the vortex generator could and does do so much 
May 26, 2009, 06:26 PM
#24
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David,
Nice work on the video. If I may suggest, to strengthen your testing, if you could attach the streamers 1-2" off the surface of the window, trunk, wing, etc. With the streamers attached directly on the surfaces, you get some boundary layer effects that give you some of the disruption I think. You might be able to take some coat hanger wire, and lodge it between the trunk and rear window to get the streamers a tad off the surface. For the top rear of the roof, you could bend some coat hanger wire to form a base, and tape that down to get the streamers a tad off the surface.
Just a thought. Nice work though.
Nice work on the video. If I may suggest, to strengthen your testing, if you could attach the streamers 1-2" off the surface of the window, trunk, wing, etc. With the streamers attached directly on the surfaces, you get some boundary layer effects that give you some of the disruption I think. You might be able to take some coat hanger wire, and lodge it between the trunk and rear window to get the streamers a tad off the surface. For the top rear of the roof, you could bend some coat hanger wire to form a base, and tape that down to get the streamers a tad off the surface.
Just a thought. Nice work though.
May 26, 2009, 06:27 PM
#25
no link...It's from the march 2005 issue (yes, I had the issue 3 yrs before I bought my car haha). I believe the 05 didn't have the wicker bill, but they talked about the vg and had a pic of how the wind passes with and witout the vg. They said it helps and talked about how it worked.
May 26, 2009, 06:40 PM
#26
Some pictures for reference of the parts we have made to help with the aero on the cars.
Rear diffuser with a good shot of the ends kicked up to keep the air out by the control arms.
Front undertray, carbon fiber lip and block off plates.
Block off plate and front lip.
Rear mirror delete plates.
Just wanted to post this to add to the discussion/information. Not to make this a sales pitch but everything pictured is available. We also stock the OEM Mitsubishi Vortex Generators.
The mirror delete plates velcro on, so they can be put on and off.
I believe one of the biggest gains to the aero on the car is closing off as much of the front end as possible. Of course on a street car that is tough as you need cooling. The openings on the outside end of the fascia though are two places I could close off and I think make a big improvement. With them there you end up with two mini parachutes on the front end, not good. If you don't think it makes a difference hold you hand out the window flat at 60 mph and then try to hold a bag with the same size opening out the window at 60 mph, drastic difference in drag. Even cupping your hand adds to the drag. Now THAT is some scientific testing!
Rear diffuser with a good shot of the ends kicked up to keep the air out by the control arms.
Front undertray, carbon fiber lip and block off plates.
Block off plate and front lip.
Rear mirror delete plates.
Just wanted to post this to add to the discussion/information. Not to make this a sales pitch but everything pictured is available. We also stock the OEM Mitsubishi Vortex Generators.
The mirror delete plates velcro on, so they can be put on and off.
I believe one of the biggest gains to the aero on the car is closing off as much of the front end as possible. Of course on a street car that is tough as you need cooling. The openings on the outside end of the fascia though are two places I could close off and I think make a big improvement. With them there you end up with two mini parachutes on the front end, not good. If you don't think it makes a difference hold you hand out the window flat at 60 mph and then try to hold a bag with the same size opening out the window at 60 mph, drastic difference in drag. Even cupping your hand adds to the drag. Now THAT is some scientific testing!
May 26, 2009, 07:25 PM
#29
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Great video man. I felt like i was on some sort of Adventure or embarking on a Wild West wagon ride with that music. That was cool to see how aerodynamic the evo. I had always wondered whether or not the Vortex generator actually did anything but it sure does.
The VG/Wingless flows air better but i would also assume that there would obviously be less downforce without the wing.
The VG/Wingless flows air better but i would also assume that there would obviously be less downforce without the wing.
