| k22addict | 03-08-2006 09:59 PM |
gc8 vortex generator
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anyone got pics of a vortex generator on a gc8?
| cfvwtuner | 03-08-2006 10:03 PM |
[img]http://images.netgrocer.com/jpegs/5480001009.jpg[/img]
| Oftenwinter | 03-08-2006 10:33 PM |
tehehe
| twizzstyle | 03-08-2006 11:55 PM |
This is my buddy's hachi roku (its his daily driver - total piece of crap, but gets good gas mileage). If you look real close in this picture, you can see the vortex generators we made....
[img]http://photos-312.facebook.com/n13/225/12/10708561/n10708561_30608312_9778.jpg[/img]
I'm an aeronautical engineering student, and this was sort of an aerodynamics experiment, so these weren't just a rice thing, they were there for a function
[img]http://photos-312.facebook.com/n13/225/12/10708561/n10708561_30608312_9778.jpg[/img]
I'm an aeronautical engineering student, and this was sort of an aerodynamics experiment, so these weren't just a rice thing, they were there for a function
| drees | 03-09-2006 12:25 PM |
How were they tested?
| txl146 | 03-09-2006 12:26 PM |
are there any vortex generator available for WRX or STi? :)
| Mumbles | 03-09-2006 12:32 PM |
[url]http://www.mitsubishi-motors.com/corporate/about_us/technology/review/e/pdf/2004/16E_03.pdf[/url]
| amukaoen | 03-09-2006 12:44 PM |
[QUOTE=txl146]are there any vortex generator available for WRX or STi? :)[/QUOTE]
yes, there are. its an aftermarket part
yes, there are. its an aftermarket part
| amukaoen | 03-09-2006 12:46 PM |
im guessing the STi roof vane spoiler does more or less the same job then?
| hanzo918 | 03-09-2006 02:05 PM |
It does the opposite, to a certain extent.
| drees | 03-09-2006 02:11 PM |
[QUOTE=txl146]are there any vortex generator available for WRX or STi? :)[/QUOTE]If by vortex generator you mean one that actually works, no.
| drees | 03-09-2006 02:12 PM |
[QUOTE=amukaoen]im guessing the STi roof vane spoiler does more or less the same job then?[/QUOTE]The end result is that both get more air flowing towards the rear wing resulting in more downforce, so yes (assuming you're talking specifically about the vortex generators on an EVO compared to the STI roof vane spoiler).
| hanzo918 | 03-09-2006 04:18 PM |
[QUOTE=drees]The end result is that both get more air flowing towards the rear wing resulting in more downforce, so yes (assuming you're talking specifically about the vortex generators on an EVO compared to the STI roof vane spoiler).[/QUOTE]
The end result is that they both get more air flowing towards the STOCK rear wing.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.
The end result is that they both get more air flowing towards the STOCK rear wing.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.
| twizzstyle | 03-09-2006 05:11 PM |
[QUOTE=hanzo918]The end result is that they both get more air flowing towards the STOCK rear wing.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.[/QUOTE]
The lift will be negligable compared to the drag loss the STi roof vane will also produce.
On the hachi, he drove a full tank on the freeway without the VG's, then drove back with them on.
He only gained like one mpg, so it didn't actually do much :lol: Going to try to remake them after we've worked some of the aerodynamics on it.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.[/QUOTE]
The lift will be negligable compared to the drag loss the STi roof vane will also produce.
On the hachi, he drove a full tank on the freeway without the VG's, then drove back with them on.
He only gained like one mpg, so it didn't actually do much :lol: Going to try to remake them after we've worked some of the aerodynamics on it.
| J-Rex2004 | 03-09-2006 05:22 PM |
[QUOTE=hanzo918]The end result is that they both get more air flowing towards the STOCK rear wing.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.[/QUOTE]
I would like to see a windtunnel test of a WRX with a stock wing or no wing to see how well the energized air sticks to the car. If the air doesn't stick to the car then drag isn't reduced.
However, without the stock wings, the vortex generators still work fine and reduce drag, whereas the STi roof vane will create lift.[/QUOTE]
I would like to see a windtunnel test of a WRX with a stock wing or no wing to see how well the energized air sticks to the car. If the air doesn't stick to the car then drag isn't reduced.
| hanzo918 | 03-09-2006 05:34 PM |
[QUOTE=twizzstyle]The lift will be negligable compared to the drag loss the STi roof vane will also produce.
On the hachi, he drove a full tank on the freeway without the VG's, then drove back with them on.
He only gained like one mpg, so it didn't actually do much :lol: Going to try to remake them after we've worked some of the aerodynamics on it.[/QUOTE]
Can you specify how the STi roof vane reduces drag?
On the other hand, I'd like to think gaining 1mpg from the VGs is significant for their size.
On the hachi, he drove a full tank on the freeway without the VG's, then drove back with them on.
He only gained like one mpg, so it didn't actually do much :lol: Going to try to remake them after we've worked some of the aerodynamics on it.[/QUOTE]
Can you specify how the STi roof vane reduces drag?
On the other hand, I'd like to think gaining 1mpg from the VGs is significant for their size.
| hanzo918 | 03-09-2006 05:36 PM |
[QUOTE=J-Rex2004]I would like to see a windtunnel test of a WRX with a stock wing or no wing to see how well the energized air sticks to the car. If the air doesn't stick to the car then drag isn't reduced.[/QUOTE]
Concurred.
Then again, I'd like to see a windtunnel test on a lot of things... =(
The air doesn't need to STICK to the car to reduce drag, it only needs to get closer to the roofline in order to reduce drag. =)
Concurred.
Then again, I'd like to see a windtunnel test on a lot of things... =(
The air doesn't need to STICK to the car to reduce drag, it only needs to get closer to the roofline in order to reduce drag. =)
| WRXSIG | 03-09-2006 05:56 PM |
ill be installing mine either tonight or tommorow :)
| Mumbles | 03-09-2006 06:38 PM |
Did any of you even look at the PDF i linked? Of course they work... :)
| drees | 03-09-2006 06:41 PM |
[QUOTE=Mumbles]Did any of you even look at the PDF i linked? Of course they work... :)[/QUOTE]They work if properly designed like on your EVO. I've yet to see an aftermarket piece that was actually engineered to do so.
| rukkie | 03-09-2006 07:29 PM |
[QUOTE=drees]They work if properly designed like on your EVO. I've yet to see an aftermarket piece that was actually engineered to do so.[/QUOTE]
agreed... they work when they're tailored and designed to work with that particular vehicle's aerodynamics, not like you slap it on just about any car and you get the same performance enhancement.
agreed... they work when they're tailored and designed to work with that particular vehicle's aerodynamics, not like you slap it on just about any car and you get the same performance enhancement.
| hanzo918 | 03-09-2006 07:58 PM |
Exactly. After reading that article, (btw thank u very much), I do plan on calculating and fabricating mai own delta vortex generators that matches mai GT wing
| Masta_Wu | 03-09-2006 08:11 PM |
Vortex generators are pretty cool devices. Most wings, if designed properly don't need these devices (fences, dogtooths, rakes, sawtooths), but they still put them on the engine nascelles for the sake of safety with a slight penalty in efficiency.
In cars, apart from the reduction of drag funcion as seen on the Mitsuba, I've also seen them used on older version BMW coupes (on the top surface of the side view mirrors). Without them, I've noticed higher noise and turbulence with the window down.
[IMG]http://pages.slu.edu/staff/hwu4/Vortex.jpg[/IMG]
If anyone were to do anything for a Subaru application, I'd prefer that it be for the side view mirrors which for some reason cause a very annoying (howling) noise at certain speeds/conditiosn on the 06 models.
In cars, apart from the reduction of drag funcion as seen on the Mitsuba, I've also seen them used on older version BMW coupes (on the top surface of the side view mirrors). Without them, I've noticed higher noise and turbulence with the window down.
[IMG]http://pages.slu.edu/staff/hwu4/Vortex.jpg[/IMG]
If anyone were to do anything for a Subaru application, I'd prefer that it be for the side view mirrors which for some reason cause a very annoying (howling) noise at certain speeds/conditiosn on the 06 models.
| twizzstyle | 03-09-2006 08:14 PM |
[QUOTE=hanzo918]Can you specify how the STi roof vane reduces drag?
[/QUOTE]
helps the flow to not separate off the roof corner, just like any SUV spoiler. Most of the drag is due to flow separation.
[/QUOTE]
helps the flow to not separate off the roof corner, just like any SUV spoiler. Most of the drag is due to flow separation.
| twizzstyle | 03-09-2006 08:17 PM |
Sorry, this is not related to VG's, but since we're on the topic of aerodynamics, here's something I did at school one day for fun........
[img]http://students.washington.edu/seanr2/WRX_CFD/stock_streamline.JPG[/img]
(don't read any info from that picture, the CFD program was crashing when I tried to do any viscous effects - flow separation - so the separation in that picture is just due to the program calculating the flow incorrectly. still a cool picture though! :D )
[img]http://students.washington.edu/seanr2/WRX_CFD/stock_streamline.JPG[/img]
(don't read any info from that picture, the CFD program was crashing when I tried to do any viscous effects - flow separation - so the separation in that picture is just due to the program calculating the flow incorrectly. still a cool picture though! :D )
| rukkie | 03-09-2006 10:39 PM |
hmm... nice wagon picture... :)
| Mumbles | 03-10-2006 01:08 AM |
[QUOTE=drees]They work if properly designed like on your EVO. I've yet to see an aftermarket piece that was actually engineered to do so.[/QUOTE]
What's your occupation? Just out of curiosity...
What's your occupation? Just out of curiosity...
| azn2nr | 03-10-2006 01:45 AM |
if mugen ever made stuff for subies it would be worth a few cents. they test their stuff in a wind tunnel. this is why they never put out a rsx rear diffuser
| drees | 03-10-2006 12:30 PM |
[QUOTE=Mumbles]What's your occupation? Just out of curiosity...[/QUOTE]Software Engineer/Developer/Manager.
Doesn't take a rocket scientist to look at the aftermarket "vortex generators" after reading the Mitsubishi paper to see what needs to be done to design one properly.
Doesn't take a rocket scientist to look at the aftermarket "vortex generators" after reading the Mitsubishi paper to see what needs to be done to design one properly.
| Mumbles | 03-10-2006 02:25 PM |
[QUOTE=drees]Software Engineer/Developer/Manager.
Doesn't take a rocket scientist to look at the aftermarket "vortex generators" after reading the Mitsubishi paper to see what needs to be done to design one properly.[/QUOTE]
I didn't say it did. ;)
We share the same job. Funny.
Doesn't take a rocket scientist to look at the aftermarket "vortex generators" after reading the Mitsubishi paper to see what needs to be done to design one properly.[/QUOTE]
I didn't say it did. ;)
We share the same job. Funny.
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