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Old 04-26-2005, 01:04 PM   #1
brcewane
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Default EVO MR "Vortex Generator" on a WRX

Hey guys,

I'm thinking of making my own "Vortex Generator" for the WRX out of fiberglass that would be like the EVO one seen here:


But without the antenna in it. What do you think?

...[Puts flame suit on]...
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Old 04-26-2005, 01:11 PM   #2
WRXSIG
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done right..itll look badass!

i wanted to look into getting one to see if it would fit but theyr like $250
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Old 04-26-2005, 01:12 PM   #3
lianregnif
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what does a "vortex generator" do?
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Old 04-26-2005, 01:13 PM   #4
lawn boy
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I personally think that they're ugly
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Old 04-26-2005, 01:22 PM   #5
subieworx
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It wouldn't do anything without being properly matched to the specs of the sti or other large wing. For esthetics only it is too Sonic the Hedgehog for me.
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Old 04-26-2005, 01:36 PM   #6
fireball_jones
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Quote:
Originally Posted by lianregnif
what does a "vortex generator" do?
Causes air to flow at a higher rate in a specific area, and used with a proper wing, should create more downforce.

Think of skyscrapers in a city, and how wind speed on the streets in between is greater than areas without skyscrapers. That's because they're giant vortex generators. You can use that channeled air to better create downforce or lift.
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Old 04-26-2005, 01:46 PM   #7
MB38
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Quote:
Originally Posted by lianregnif
what does a "vortex generator" do?
Generates vortexes.
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Old 04-26-2005, 01:50 PM   #8
TopSpeed
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Quote:
Originally Posted by MB38
Generates vortexes.
That would be "vortices".



-Porter-
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Old 04-26-2005, 02:59 PM   #9
ibsailn
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Default Not at all how they work

Quote:
Originally Posted by fireball_jones
Causes air to flow at a higher rate in a specific area, and used with a proper wing, should create more downforce.

Think of skyscrapers in a city, and how wind speed on the streets in between is greater than areas without skyscrapers. That's because they're giant vortex generators. You can use that channeled air to better create downforce or lift.
While it would be hard to argue that skyscraper do not generate vortices, this is not why it is windy between buildings. It is windy between buildings because a certain flowrate is being constricted thru the streets (acting as nozzles) and therefore the fluid (air) is accelerated. This is also not a good description of how the vortex generators create more flow to the wing.

We often use votex generators in model testing in my business (yacht design). We use them for slightly different reasons, but the theory is the same. The best layman explanation is similar to the dimples on a golfball. By generating vortices (turbulance), the flow stays attached to the surface longer and therefore drag is reduced. Also, in the case of the rear of the car, keeping the flow attached to the rear-sloping roof will help keep high velocity flow on the rear wing.

As far as having them be effective on a WRX, your guess is as good as mine. There is a parasitic drag caused by the vortex generators, so that would have to be overcome thru improved flow for them to be worthwhile. Whichout wind tunnel testing, it would be hard to know if they are helping or hurting.
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Old 04-26-2005, 03:49 PM   #10
ranger5oh
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Best way to describe vortices: They mess up the airflow... the "sloppy air" , just as ibsailin says, stays attached to the surface. Flow that seperates from the surface doesnt provide the correct aerodynamics for optimum downforce and minimum drag. This is the same reason fighter jet intakes are a few inches off the surface of the fuselage of the jet. (Note, I am an aero engineer for a military aircraft company)

Anyway, I dont thin kthis guy is interessted in the performance of them, nor am I. I love the look , and if you make a good set, I would be interested in buying one off you.

Thanks,
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Old 04-26-2005, 04:15 PM   #11
KAX
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as i knew it when i first saw these vortex generators... give it a few months, every civic will have one. I dont think it will be worth anything for your car, dont bother
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Old 04-26-2005, 04:46 PM   #12
offset
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(Slight tangent) So going forward with the thought on what a vortex generator would be used for on a car; it wouldn't make sense with an STi from what I can gather. I tend to believe that the point of the STi wing is less about downforce and more about lowering the overall drag coefficient by smoothing out the air. So disrupting the air even more before the STi wing would make the wing less efficient for its intended purpose. At least that is the way I am interpreting things. (off tangent)

So what is the point of the WRX wing? I would tend to believe it is closer to improving downforce than lessening drag. However I don't know that it sits high enough to catch and benefit from the vortex generated air flow. It would certainly be interesting to see in a wind tunnel, but that is the problem that I believe a wind tunnel would be the only way to know and they ain't happening.

offset
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Old 04-26-2005, 04:49 PM   #13
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Quote:
Originally Posted by brcewane
Hey guys,

I'm thinking of making my own "Vortex Generator" for the WRX out of fiberglass that would be like the EVO one seen here:


But without the antenna in it. What do you think?

...[Puts flame suit on]...
I like the idea and would love to see how it comes out.

~v6
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Old 04-26-2005, 04:50 PM   #14
Handsdown
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subaru's already working on vortex generators...

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Old 04-26-2005, 05:01 PM   #15
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Quote:
Originally Posted by Handsdown
subaru's already working on vortex generators...

Aren't those made by Adobe?
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Old 04-26-2005, 05:07 PM   #16
WRX450
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Default too bad

That wasn't even a valiant attempt at a photo manipulation...
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Old 04-26-2005, 05:54 PM   #17
Handsdown
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you're right, it was a photo manipulation with intent of horseplay and general silliness... sorry i'm not valient enough for you!
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Old 04-26-2005, 08:40 PM   #18
fireball_jones
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Quote:
Originally Posted by ibsailn
While it would be hard to argue that skyscraper do not generate vortices, this is not why it is windy between buildings. It is windy between buildings because a certain flowrate is being constricted thru the streets (acting as nozzles) and therefore the fluid (air) is accelerated. This is also not a good description of how the vortex generators create more flow to the wing.
My bad, half way through typing that my brain mixed up vortex and the venturi effect

I've never read anything that said they had any definite effect on the Evo, let alone what they would do to an STi. But they do look cool.
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Old 04-26-2005, 08:43 PM   #19
flicky30
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That is THE MOST rediculous photochop ever. Wow, that's one I'll have to "right click and save picture as"
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Old 04-26-2005, 10:37 PM   #20
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i like the wrap-around taillight effect
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Old 04-26-2005, 10:47 PM   #21
JIN
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They actually made vortex g for the subies. In fact, I have seen a couple of them around in the subies here in Singapore. Even saw one in carbon fiber too ... really nice.

Jin
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Old 04-26-2005, 10:50 PM   #22
moss
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Quote:
Originally Posted by JIN
They actually made vortex g for the subies. In fact, I have seen a couple of them around in the subies here in Singapore. Even saw one in carbon fiber too ... really nice.

Jin
Its your job to get a picture any for the GCs

keith
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Old 04-26-2005, 11:02 PM   #23
twizzstyle
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Quote:
Originally Posted by fireball_jones
Causes air to flow at a higher rate in a specific area, and used with a proper wing, should create more downforce.
You couldn't be more wrong, sorry!

Vortex generators generate tip vortices that trail behind them. What this does essentially is delay boundary layer separation, and thus delays stall. On an airplane wing, they are no more than small fins of aluminum. In fact, this would probably be more effective than these "thicker" ones. But the idea is the same. Having these on a car has a similar result as a spoiler in that location (like on the back of SUVs). Basically, it keeps the air from seperating as much, decreasing drag (the majority of drag on an object is the result of flow separation on the back)
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Old 04-27-2005, 02:34 AM   #24
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Quote:
Originally Posted by volleybrad
Aren't those made by Adobe?
ya, and adobe lost money on this investment, thus the small number produced.
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Old 04-27-2005, 02:48 AM   #25
MikeBuzzsaw
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Quote:
Originally Posted by twizzstyle
You couldn't be more wrong, sorry!

Vortex generators generate tip vortices that trail behind them. What this does essentially is delay boundary layer separation, and thus delays stall. On an airplane wing, they are no more than small fins of aluminum. In fact, this would probably be more effective than these "thicker" ones. But the idea is the same. Having these on a car has a similar result as a spoiler in that location (like on the back of SUVs). Basically, it keeps the air from seperating as much, decreasing drag (the majority of drag on an object is the result of flow separation on the back)
Its like communism. In THEORY, it will help you reduce drag, but in real life, no1 has seen an increase in anything.
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