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Old 01-01-2013, 01:46 AM   #321
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no, I left the middle of the middle of the trunk were it is until i order a fuel cell
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Old 01-01-2013, 02:32 AM   #322
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I'm cleaning the increased air pressure in the rear wheel wells. Still have to customize the rear bumper
Very nice. I have the rear "flaps" cut out but I haven't cut the jack recess yet. Why not cut the flange and take that weight out?
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Great idea, RJ. Did you do the same for the middle of the trunk?
No aerodynamic reason to. The jack recess is in the tire wake while the center of the trunk shouldn't be in the stream of air due to the diffuser.
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Old 01-01-2013, 03:05 AM   #323
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Very nice. I have the rear "flaps" cut out but I haven't cut the jack recess yet. Why not cut the flange and take that weight out?
Which part?? Happy New Year
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Old 01-01-2013, 10:16 AM   #324
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Originally Posted by 1993ka24det View Post
Which part?? Happy New Year
The flange with 2 holes on the top of this picture:


I'm just trying to make sure there isn't a function for it I missed. Happy New Year
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Old 01-01-2013, 10:22 AM   #325
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And the trunk's belly is a structural rigidity element that shouldn't be removed unless something else structural is added.
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Old 01-01-2013, 11:01 AM   #326
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Originally Posted by njn63 View Post
The flange with 2 holes on the top of this picture:


I'm just trying to make sure there isn't a function for it I missed. Happy New Year
I don't know why I left the flange there, I guess just to add flair

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And the trunk's belly is a structural rigidity element that shouldn't be removed unless something else structural is added.
True, I was thinking of linking the two rear roll bar mounts. Sorry to get off topic of Aero. Hey Six I will be in Tampa soon
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Old 01-01-2013, 11:46 AM   #327
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The section 1993ka24det cut out is also a rust point. I cut mine out when I did the swap for that simple reason.
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Old 01-07-2013, 11:25 AM   #328
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And the trunk's belly is a structural rigidity element that shouldn't be removed unless something else structural is added.
I've seen the trunk resessed area replaced with thin light material on race cars at TC Design Fab, Tony knows what he's doing over there, I'm guessing his cages take care of any rigidity issues. (They tie into the rear shock towers)
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Old 01-10-2013, 04:34 PM   #329
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I'm curious why isnt anyone doing any fancier body work? Like putting the corners on an angle to make the front more arrow like?
pointy is for airplanes that go past the speed of sound.. they NEED pointy to make the shockwave break where the designers want to.

below that speed, look more at cargo planes, with their curves for air funneling.

A ton of people have this misconception that sharp and ponty means "faster"

When F1 teams back in the day hired some Boeing aero engineer to help them, the engineer told them "you dont need me, you want the guys that built the WW2 planes, aero works different when you go past the speed of sound"


You put anything in the airflow that is moving air to the side or up or down, it will cause drag. The splitter is just sperating the air, and then directing up and over, or to the sides, creating high pressure on that side(s) (gross oversimplifaction I know)

now question i have, people that run with canards, depending on if you run a clockwise or counter clockwise track, can you test running one side or the other.. see if raising pressure on one side of the car could help? I know oval cars are set up on the extreme end for that kind of stuff
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Old 01-10-2013, 06:48 PM   #330
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Yep. If you want low drag at sub-sonic speeds you should be thinking tear drop, not arrow.

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Old 01-10-2013, 09:13 PM   #331
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Good picture, but isn't the shape and the resultant cd more to do with the back of the object and the air seperation /turbulance?

I mean what if the first pointy example was pointy at the back too? Not a dome as shown....I suspect then it would have a pretty good CD again...

Hence why F1 and all high end race car designers focus so heavily on the rear end.

As do the yacht hull and keel designers, wing keels were designed to minimise drag not provide lift and so on....Boeing with the vertical wing tip extensions...

Which leads me back to the MX5....undertrays and diffusers etc....It would be great to know how much of an effect they could potentially have on our little cars.

Then we could decide on whether it is cost effective to focus on that area or not...I mean if "theoretically" the best diffuser gained 1 MPH and 1 KG of downforce I can see many other areas to focus on...

If on the other hand it was theoretical to see a gain of 15MPH and/or 40Kg downforce, it might be higher up the priority list.....

Some experienced designers must be able to give us a ball park.....
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Old 01-11-2013, 11:15 AM   #332
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Lets keep this thread on topic and avoid the engineering student discussion on who's brain is bigger to another forum. This is more of a rocket city rednecks aero thread.
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Old 01-11-2013, 06:33 PM   #333
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Very Nice! Is that a one-off or a production piece?
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Old 01-11-2013, 06:38 PM   #334
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Quote:
Originally Posted by Handy Man View Post
Very Nice! Is that a one-off or a production piece?
If you are referring to the white NB in Jake's post, no. OTS from Autokonexion. Something I designed but never had built for myself. Mike liked it and put into production. Good race or street nose, covers 9's, low drag, room for brake ducts and oil cooler without hacking more holes in the nose. In the end we went with the ABS sheet set up instead.
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Old 01-11-2013, 10:56 PM   #335
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Good race or street nose, covers 9's, low drag, room for brake ducts and oil cooler without hacking more holes in the nose.
Exactly what I was thinking. Nice job! Now only if it were for an NA
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Old 01-11-2013, 11:21 PM   #336
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Exactly what I was thinking. Nice job! Now only if it were for an NA
...and fit to stock fenders instead of flares.
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Old 01-12-2013, 12:17 AM   #337
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They make a fairly similar NA bumper as well

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Old 01-12-2013, 03:56 AM   #338
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^ definitely not as good aerodynamically.
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Old 01-12-2013, 05:39 PM   #339
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For you V8/LS1 guys, how big are your radiator openings in your air dam? Mine is measuring 6" tall by exactly the width of the radiator core including end takes, but I can't help but feel that I'll be choking off the radiator somehow, and am terrified of having overheating issues. I'm using an ABS inlet box with a venturi shape that seals to the radiator which is laid forward at an angle (with a mother thumper SPAL puller fan on the engine side), so all air would have to be drawn in through the inlet box.

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Old 01-12-2013, 07:00 PM   #340
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Sounds about right. A rule of thumb is that you want the inlet to be 33% the area of the heat exchanger.
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