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Old 12-13-2015, 05:31 AM   #1001
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What is the NC splitter made of?
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Old 12-13-2015, 10:23 AM   #1002
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it's fiberglass honeycomb
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Old 12-15-2015, 11:10 PM   #1003
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That NC looks amazing. I love it ALOT!!!!!!!!!!!!
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Old 12-19-2015, 09:40 PM   #1004
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Quote:
Originally Posted by Justin case View Post
Hey everyone,I think I know the answer to this already but I have a question regarding how effective (or not effective) this diffuser design is. Just asking for the sake or learning more if I ever design my own.






Hey that's my diffuser!

Like ThePass said, the most important part to a functioning diffuser is a flat floor infront of the diffuser. I'm working on second design that will feature a curved profile instead of flat. It will help the air stay attached to the diffuser surface at more severe angles.

Also the angle on the diffuser in the pictures is adjustable. You can run it right up to the bumper if you wanted to.
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Old 12-20-2015, 02:37 PM   #1005
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from m.net

Bumper Cutout CFD - MX-5 Miata Forum

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Old 12-20-2015, 03:02 PM   #1006
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Had some time to work on a new front end for the race car. All removed with 4 bolts at the front. Will get a picture with the bumper attached. Its nice to have all of the ducting attached to the undertray instead of the car. so much easier to work on.



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Old 12-20-2015, 07:50 PM   #1007
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Quote:
Originally Posted by mr2daj View Post
Had some time to work on a new front end for the race car. All removed with 4 bolts at the front. Will get a picture with the bumper attached. Its nice to have all of the ducting attached to the undertray instead of the car. so much easier to work on.
Do you have a build thread anywhere? That car looks very well put together and I would like to grok it.
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Old 12-20-2015, 07:56 PM   #1008
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Love the idea and implementation, my concern whenever I consider this type of setup is removing the front tie bar across the front of the chassis...would be so nice to have it all on the undertray as you say!

Are there no issues with chassis or overall strength when removing that bar?

put to OP and others....
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Old 12-20-2015, 08:00 PM   #1009
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Also, Emilio I thought that you were one of the defenders of not bothering to cut out rear bumpers, I could be mistaken or is this no longer the case?
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Old 12-21-2015, 12:22 PM   #1010
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Originally Posted by mx5-kiwi View Post
Also, Emilio I thought that you were one of the defenders of not bothering to cut out rear bumpers, I could be mistaken or is this no longer the case?
The end result is on the order of tenths of a lb changes in drag and downforce. This is so far down in the weeds as to be immeasurable.
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Old 12-21-2015, 02:41 PM   #1011
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Originally Posted by 90civichhb View Post
Do you have a build thread anywhere? That car looks very well put together and I would like to grok it.
I do bit it is a little outdated. There will be a big update soon Ak Automotive Race Car - Members Rides - MX5Nutz Forum

Quote:
Originally Posted by mx5-kiwi View Post
Love the idea and implementation, my concern whenever I consider this type of setup is removing the front tie bar across the front of the chassis...would be so nice to have it all on the undertray as you say!

Are there no issues with chassis or overall strength when removing that bar?

put to OP and others....
It does not seem to have had an effect at all. It has been like that for a couple of years now. we used to have a bit of ally box section riveted between the legs but with it removed it made no difference. The subframe does a pretty good job of bracing the chassis legs.
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Old 12-22-2015, 11:30 PM   #1012
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I too haven't had any issues with that cross section removed. I have a small 1" square tube welded in between the two sides, so not quite as drastic as having nothing spanning that gap, but that tube is mostly there just to support the front of the intercooler, not so much for the chassis.
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Old 12-23-2015, 07:04 AM   #1013
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Isn't anything in front of the crossmember "just" for crash protection and support for body panels etc.
But with an improved (flimsy) crossmember you might need help with stability from the framerails.

Having stock structures helps when bouncing against guardrails...
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Old 01-05-2016, 08:58 PM   #1014
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When designing an air damn the air intake has a certain size that is an optimal combo of drag vs air intake right? Does this change when adding a grill? When adding a mesh grill do you take the area of the bits blocked by the gril into account?

Just thinking. No actual reason behind the question, thought this would be a good place to ask.
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Old 01-05-2016, 09:45 PM   #1015
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Originally Posted by aidandj View Post
When designing an air damn the air intake has a certain size that is an optimal combo of drag vs air intake right? Does this change when adding a grill? When adding a mesh grill do you take the area of the bits blocked by the gril into account?

Just thinking. No actual reason behind the question, thought this would be a good place to ask.
Post #7, page 1.

Quote:
Originally Posted by emilio700 View Post
Grill and mesh choice
We typically make grills from three meshes of different open ratio. Basically cool and hot weather. With a reroute, it's easy to overcool the engine to the point that the oil doesn't get hot enough. The more closed it ism the less aero drag and more downforce on the front end.

Wire mesh from mcmaster.com
9217T41 81.5% open area hot weather (pictured)
9641T241 61.6% open area warm weather
9227T632 44.8% open area cold weather, what we ran at T25.

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Old 01-05-2016, 09:46 PM   #1016
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I've read that. But should the opening stay the same?
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Old 01-05-2016, 09:48 PM   #1017
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If you're calculating the "ideal" opening size, then block some of it again with mesh, I'd think you'd need a bigger starting opening to get the same amount of air through.
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Old 01-05-2016, 10:49 PM   #1018
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I run 1/2"galv. farmers cloth, also known as construction cloth, picture above. On cold mornings I just add duct tape till it warms up in the afternoon. To answer your question I don't think the 1/2" effects the issue enough to figure it as being in the equation. Going to the 1/4" or 1/8" would be a different story.You can buy this stuff at any local hdwre store usally by the foot.
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Old 01-08-2016, 12:35 AM   #1019
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My answer to a question no one has asked; EZ on-off splitter, steetable track car. Basically I don't wanna have to buy a trailer so...The 4 front elements nest together and fit on the parcel shelf for transport to and from the track.




4 Removable front elements





Front elements mounted





This section remains on the car and serves as the mount for the removable front elements
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Old 01-08-2016, 08:42 AM   #1020
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Originally Posted by joeereid View Post
I like this idea the most for my application. I have thought about this a lot, but most of my reason for a removable splitter is that I can try different designs while not wasting more materials or taking up large space. It looks like you just soldered the aluminum channel together but how are you mounting it to the chassis? It all looks very well done.
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