Aerodynamic Discussion Thread - Page 12 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-29-2013, 05:21 PM   #221
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Quote:
Originally Posted by Handy Man View Post
Like Blackbird said, EP cars have been doing similar setups for a while... but since you asked, here is the original thread from when I did mine back in 2011, it was the first non-EP Miata with one that I know of: Home made splitter/air dam/ducting
MAD MAX meets Miata!!! I like!
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Old 05-29-2013, 07:40 PM   #222
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Quote:
Originally Posted by Leafy View Post
Just use 4 bolts under the hood for the bumper, and cut the point out where it bolts to the fender and replace it with a quick latch like thing. Something like these but smaller theres plenty of options.
I used 4 dzus fasteners along the top edge and then one on each corner with these brackets attached to the fender. Has held up that way for 2 seasons but it's just the bumper skin.

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Old 06-01-2013, 08:56 PM   #223
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Quote:
Originally Posted by njn63 View Post
I used 4 dzus fasteners along the top edge and then one on each corner with these brackets attached to the fender. Has held up that way for 2 seasons but it's just the bumper skin.

Pictures:

I will be working on the same idea, but a tube frame for the bumper supports. The radiator for the engine swap will be moved from the stock 8 deg angle to 30-35 deg angle. There will be a radiator duct exiting out through the hood. Here is a close pic to what I will be working on in a month.


AMS Evo X Hood Radiator Vent






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Old 06-01-2013, 10:23 PM   #224
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Why is the hole not a gaping hole?
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Old 06-01-2013, 11:17 PM   #225
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Originally Posted by triple88a View Post
Why is the hole not a gaping hole?
I think its because there is an engine in the way..lol

Its kinda making a wing shape with the top of the hood and the top portion of the Radi duct.

I talked to Paul (plucas) about it and he recommended a low resistance flow radiator





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Old 06-01-2013, 11:17 PM   #226
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I'm referring to the hole in the front in front of the intercooler.


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Old 06-01-2013, 11:27 PM   #227
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Quote:
Originally Posted by triple88a View Post
I'm referring to the hole in the front in front of the intercooler.


I think it was in the book Maximum Boost that talked about when making a duct to go to the radiator or intercooler has to be 20%-30% smaller than the surface area of the heat exchanger. I guess it is to draw the air in, instead of force it in with drag on the car.
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Old 06-01-2013, 11:36 PM   #228
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triple post please delete
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Old 06-01-2013, 11:42 PM   #229
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triple post please delete
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Old 06-01-2013, 11:44 PM   #230
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Finally took this out,

Monster grip, very very stable.

Happy days.

Turbo setup held up good also.

In, passed scrutineering no hastles, drop the tyre pressures on the slicks, check, double check, triple check.

Out for qualifying, first lap out, first time down the straight the splitter failed.

I tested it to about 150kg jumping on it so I was amazed, when he came in a quick check showed that it generated so much downforce it tore chunks of steel out of the bodywork!



Here is a piece I retrieved from the other side.



Its held on with 6 bolts and only the front 2 had issues, so lesson learned, the splitter is way way more efficient than Id even hoped so it was remounted with a temporary but strong solution. So great news about the front aero design, also looks like the cooling issues the car has always had have been solved with these recent changes.

Here is the excel series and the pulsar series in together.

And a few pics from the field.








Dann
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Old 06-02-2013, 12:05 AM   #231
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OK so a triple post but that is a good looking track Miata. I mounted my splitter to a steel structure that bolts to the factory bumper bulges (bumper bulges been removed)
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Old 06-02-2013, 12:07 AM   #232
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**** me, can someone please fix the TP.

I didnt realise, I was having trouble with firefox, using chrome now, swore I never would.

Thankyou mate, this was remounted using the factory weld nuts you can see in the first photo.

Thanks
Dann
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Old 06-02-2013, 12:15 AM   #233
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Also the hole has to be smaller than the surface area of a cooler because if the coollers frontal area is 50% metal, 50% air holes then it will only flow 50% of its area wont it.

Dann
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Old 06-02-2013, 12:19 AM   #234
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Oh i see. Well you learn something everyday. I always thought you wanted more pressure in there.
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Old 06-02-2013, 12:24 AM   #235
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No it doesnt need to be smaller but thats why it can be, My apologies.

Im fairly certain making it larger doesnt do anything because there isnt more pressure just a boundary layer.

Dann
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Old 06-02-2013, 02:23 AM   #236
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Quote:
Originally Posted by Handy Man View Post
Like Blackbird said, EP cars have been doing similar setups for a while... but since you asked, here is the original thread from when I did mine back in 2011, it was the first non-EP Miata with one that I know of: Home made splitter/air dam/ducting
Your thread was my inspiration to build mine.
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Old 06-02-2013, 06:23 AM   #237
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Nice work Dann.
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Old 06-02-2013, 06:40 AM   #238
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You are a LOT of my inspiration Dave.

Dann
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Old 06-02-2013, 09:59 AM   #239
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Quote:
Originally Posted by mr_hyde View Post
Your thread was my inspiration to build mine.
Awesome

Regarding the heat exchanger intake area: The reason you want the intake area to be about 1/3 of the frontal area of the heat exchanger is due to bernulli's principle. The efficiency of a heat exchanger is affected by the pressure differential across it. Bernulli says that when velocity decreases pressure increases. So if we have a small opening with ducting that opens up behind it, the velocity will decrease as the cross sectional area of the ducting increases and it will create a higher pressure in front of the heat exchanger.

Regarding your torn out splitter mounting points: why not use those nice reinforced threaded holes just above the holes you used? Thats what I've used to support my similarly sized splitter for years without any problems.
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Old 06-03-2013, 03:40 AM   #240
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Thats what I ended up doing..

i dunno..

I dunno.

Anyway lesson learned and thats the important part.

Dann
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