MKII CFD Aerodynamics Analysis - Page 5 - MR2 Owners Club Message Board
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post #81 of 345 (permalink) Old March 3rd, 2011, 18:06
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oops. dup

Last edited by Raising Arizona; March 3rd, 2011 at 18:46.
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post #82 of 345 (permalink) Old March 3rd, 2011, 18:07
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Quote:
Originally Posted by Svx92
What rear diffuser are you running Arizona?
I made one from T60 aluminum. Its just like the Lotus Sector 111 version or pretty close anyway. I have a vertical TMIC as well, so its a aero/scoop package deal. I'm sure it all has to be sealed to be 100% effective, totally agree. I'm just curious if what I made works. this is from last fall and I now have 6 turn buckles holding it and a custom exhaust that's not quite finished..but the idea is Next is, I use this for a mold and carbon fiber it..

Also, don't bash me to bad, but I painted it flat black and it chips super easy from the tires, so wrapped it with 3M carbon fiber material. Kinda cheesy, but you can hardly see it.


Last edited by Raising Arizona; March 3rd, 2011 at 18:11.
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post #83 of 345 (permalink) Old March 20th, 2011, 02:56
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Can you please run a simulation with a flat under tray that completely closes off the engine compartment so only the side and top vents provide air circulation?

Thanks.

Here is a picture of how it is done on the Ford GT. It surprises me that they used a "golf ball" like surface in some areas.
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post #84 of 345 (permalink) Old March 20th, 2011, 06:22
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Yup- that's another way to do it. ^
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post #85 of 345 (permalink) Old March 22nd, 2011, 19:02
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Hopefully this thread hasn't died already. It is has great potential! Please continue to do your simulations.
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post #86 of 345 (permalink) Old March 22nd, 2011, 22:58
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Yes, it is a good thread. Very educational.
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post #87 of 345 (permalink) Old March 22nd, 2011, 23:13 Thread Starter
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Nope, not dead. Its just a project that I work on when I have spare time / get bored


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Specializing in suspension and handling for the MKII MR2

Custom Koni coilovers and coilover housings, suspension geometry correction kits, camber/caster plates, big brake kits, and more

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A retro-active build thread for my track / autocross car
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post #88 of 345 (permalink) Old March 22nd, 2011, 23:16
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then get me the program, ill go ape____
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post #89 of 345 (permalink) Old March 24th, 2011, 03:28
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Quote:
Originally Posted by Lancebringer
then get me the program, ill go ape____
+1 I have solidworks, I'd just need files shared with me. What's a more perfect way to learn SW than toying with an MR2?
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post #90 of 345 (permalink) Old March 24th, 2011, 04:53
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I wouldn't mind a copy of that model either. the more places it is the less likely it'll disappear.
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post #91 of 345 (permalink) Old March 27th, 2011, 04:40
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Alex,
Excellent work. I have SW2011 Pro Simulator. If you don't mind sharing please send me the model.
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post #92 of 345 (permalink) Old April 5th, 2011, 15:11
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Hey gents, deseroner posted up this link for some wheel well splitters. https://mr2oc.com/showthread.php?p=4661979#post4661979 Any chance you could plug those in and see if they make a noticeable difference? Seems like they would be pretty straightforward to fab up.

I saw that you did a couple of front air dams as well, any chance at doing something like those speedflaps? Like these http://www.emspowered.com/storefront...roducts_id=207 Always kinda wondered the feasibility of running some speed flaps for the rear wheels as well.

And lastly! https://mr2oc.com/showthread.php?t=418107 The holy splitter! Pretty please?

-D
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post #93 of 345 (permalink) Old April 6th, 2011, 03:11
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Seem's like Alex is the only one with a solid model. Hopefully he share's it with people interested in doing more simulations.

On the wheel well splitters, more than likely they will have no benefit on a production vehicle. A ton of emphasis on front aero parts on race cars is how they affect the air at the rear of the car. The function of them probably to affect how air flows over the rear of the car and not to direct air around the wheel well opening.

I could be wrong, I just get that impression because the sample pic's for it are all of like GP cars.

Last edited by Caprandom; April 6th, 2011 at 03:38.
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post #94 of 345 (permalink) Old April 6th, 2011, 03:57
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That's possible as well. I would have guessed because they look tacky, but if its a functional piece and you're running a track car, might not be too terrible.

-D
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post #95 of 345 (permalink) Old April 10th, 2011, 02:41
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I say read and apply
https://www.mr2oc.com/showthread.php?t=338459&page=1
I plan on doing mods myself, since i cant get anyone to put them into SW, nor can i get my hands on an older version of SW or any other CFD program for free...
Im going to "real world" test them.
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post #96 of 345 (permalink) Old April 10th, 2011, 14:20
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Quote:
Originally Posted by Caprandom
On the wheel well splitters, more than likely they will have no benefit on a production vehicle. A ton of emphasis on front aero parts on race cars is how they affect the air at the rear of the car. The function of them probably to affect how air flows over the rear of the car and not to direct air around the wheel well opening.
The explanation of them from the early 90s when IMSA GTP/lights cars were using them was that they assisted the extractors behind the front wheels and kept air from getting mixed up in the wheel wells in an attempt to keep flow alongside the car as smooth as possible.

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post #97 of 345 (permalink) Old April 14th, 2011, 17:50
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I thinki a more accurate desription of the wheel splitters is they act like a gurney flap aiding in extracting air from the front wheel well.
The front diffusers of the racecars often dump their air into the wheel wells and the spinning front wheel causes a high pressure to build up in the wheel well.

In removing high pressure air in the wheel there is a reduction in aerodynamic lift on the front axle.
The louvers on top the wheels extract the high pressure also.
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post #98 of 345 (permalink) Old April 24th, 2011, 07:52
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I have this rear diffuser on and tested at high speeds, low speeds, etc. Something I've noticed, how dirty and dusty the back of the car gets.... The vertical mounted IC stays so much cooler than without... thus far its proven very effective.
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post #99 of 345 (permalink) Old May 13th, 2011, 21:33
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I think I went into some kind of diabetic geek-shock reading this thread.

Hmm, stuff that would be curious to see (and easy to do)

-A ~4-6" splitter on the front at basically the stock ride height.
-"speed flaps" on the leading edges of the wheel wells
-Extending the roof a little and adding some of those vortex generator thingies (like if you bridged the area above the engine bay)
-Blocking off the undertray but then actually modelling some ducting out the hood (and maybe taking some sucker fans into account)

Also, did your model reflect the scoop-like final undertray? (can't recal the number).
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post #100 of 345 (permalink) Old May 13th, 2011, 22:17 Thread Starter
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Quote:
Originally Posted by Wheelman13
I think I went into some kind of diabetic geek-shock reading this thread.

Hmm, stuff that would be curious to see (and easy to do)

-A ~4-6" splitter on the front at basically the stock ride height.
-"speed flaps" on the leading edges of the wheel wells
-Extending the roof a little and adding some of those vortex generator thingies (like if you bridged the area above the engine bay)
-Blocking off the undertray but then actually modelling some ducting out the hood (and maybe taking some sucker fans into account)

Also, did your model reflect the scoop-like final undertray? (can't recal the number).
A splitter is actually something I am working on (although not necessarily on a stock car / stock height).

Speed flaps are another I would like to try. Honestly, I just havn't been able to find / make the time to work on this lately. Spring / summer brings too much need to work on my actual car, rather than a computer model of my car
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