That was never stated. It will provide a small decrease in drag. It will not hurt your car's performance.
As I always do, I will redirect you to this article, which taught me quite a bit about VGs before I saw it on the Evo: http://www.mulsannescorner.com/vortexlift.html

 

westside, cool sight. Been there before but never had much time to look around. If you go to his main page(everyone should go to this and learn something. Click on the car image at the bottom) under Race car tech Riley and Scott mkIII series C. The Dyson racing car at the top(Thetford across the front) and the Robinson racing car at the bottom(74 )are two of the cars I work on now. Funny to see them there.

All this talk about downforce when there really is no such thing on a production based car. Wings and splitters are really just decreasing the amount of lift that the cars make.

As westside would do(if you don't mine me saying this), redirect to the race car aerodynamics data base. Notice how the street cars are measured in lift at the top not downforce(except the 360 which had extensive wind tunnel testing done).

 

its at its best with the wing!

 

all these are theories that apply differently, depending on the variable. in the mitsu white papers regarding VG, variations of VG placement, angle and even height of the VG was tested.. but ALL were tested WITH the evo spoiler. so in that test, they proved there was a slight reduction of drag coefficient and uplift. now the presense of VG does not necessarily always mean improvement, since VG itself causes drag. so it would take some testing to see how VG is effects the rear end of the evo without a spoiler. what is not in question right now is the VG causes drag.

 

it is still perfectly functional even without the wing... t

he reason why they say it increases the wing's efficiency is because it does. wings opperate best when there is unperturbed air traveling over and under them. the vg makes the air suck down to the rear of the car as to not flop off and hit the wing. (normal race cars just have super high wings that are over the roofline).

also... any aerodynamic improvement carries it's improvements at all speeds. even at a dead stop (if the wind is blowin). it's just tuned for a maximum effect at a certain speed. which is certainly waranted... that's why adjustable wings are important in racing. but that don't mean that there aren't real benefits at other speeds.

 

it's still going to create vortex, but where is that vortex gonna be redirected?

probably the trunk lid. after 100mph, probably shake your tail a bit. not much downforce back there without the help of the wing.

 

maybe. Read this article. It will explain the reason for the combo. The height design of the VG is solely for the purpose of the stock wing at certain speeds.

Official research article on the VG.


http://www.mitsubishi-motors.com/cor...004/16E_03.pdf

 

good find, i should reconsider.

 

why would it be solely for the stock wing? the vg still makes the boundary layer flow over the rear of the car thinner. this reduces the break off of the air behind the car which reduces drag. it's not all about downforce and improving it and the function of the wing. it also reduces the coefficient of drag.

 

Will these work with the OZ Rally spoilers even though they are lower than the evo the wing

 

hte oz rally spoiler is for decoration.

 

You're absolutely correct. The Evo IX has extensive wind tunnel testing, though, and will feature 0 lift at perhaps 150mph, according to magazines. It's awesome that you work on the Riley and Scott car, that's hardcore

 

While it's not the downforce inducing, engineered by God Himself wunderwing that the evo wing is, it still has a function. It's a spoiler- it "spoils" the laminar flow over the rear deck and reduces the amount of lift induced by this flow. It helps the rear feel more stable. I've driven without it and with and I can feel the difference with.

Also, they're availble for the Evo (I've seen them, they're kinda ugly and outta place)

the VG adds 0.01x drag and reduces lift by 0.01x IIRC from that article. So while technically the answer is "yes, it works" without the spoiler, the effect is slight. And if you didn't know you had it on the car, you probably wouldn't know you had it on the car IMO.

EDIT: My bad- page 6 of the above technical article basically reads: application [of the VG] showed a reduction of 0.006 in both drag and lift coefficients at the test speed.

I stand corrected

 

I didn't realize that they made the VG angle, length, and spacing for best results with the spoiler. This still doesn't disprove the fact that it increases base pressure (which reduces drag). The article I posted, at the very bottom has a quotation from Juhas Kivekas: That was conducted on cabs with no spoiler. Obviously this is not the same as the Evo VG, but it proves that a VG will increase base pressure, which means that it will decrease drag with or without the wing.

 

Personally I think the VG looks gay enough that I can live without the extra .05 % downforce it provides at 100+ MPH. You can actually create more of a dramatic effect by sticking your hand on top of your roof like a shark fin.