Yup, Google wrc tire change or something or wrc jacks. Some gt1 style air jacks would be dope though

Under tray, under engine
 

I'm using aluminum sheet only. It doesn't extend beyond the bodywork so I'm not concerned about ultimate stiffness. I forget the thickness.

At present there's no tray under the engine.

The only thing about air jacks is that they are so expensive as a kit, but since I am a hydraulics guy that works on C-130's I don't think it would be hard to make a air system for a car.

cordycord-- Ok I working with .063 and I might use it under the engine or use the rest of my 5x12 sheet to make duct work for air in the rear wheel wells.

Any have the measurements from the widest the front bumper gets and from the steering rack to the edge of the front bumper

You're just down the street in San Diego...maybe we'll need to check it out with your car. :)

Yep. That's pretty much what factory flat bottom cars do. Some tube frame cars just weld on a jacking puck and drill a hole for it in the undertray.

donour

Cool thread. Sub'd.

There is a "thread tools" dropdown menu that allows you to subscribe to any thread without adding a post.

Is it a new hardtop? Nope its the new splitter Im building. I guess you gotta get it home some how lol


Sorry I got scratch's on my Galaxy Note's camera lens
https://www.miataturbo.net/attachmen...ine=1363364814

https://www.miataturbo.net/attachmen...ine=1363364814

https://www.miataturbo.net/attachmen...ine=1363364814

Here are some more pics from today

https://www.miataturbo.net/attachmen...ine=1363375326

https://www.miataturbo.net/attachmen...ine=1363375326

https://www.miataturbo.net/attachmen...ine=1363375326

Splitter mounts

https://www.miataturbo.net/attachmen...ine=1363375326

More pics to come

Looking good but two queries:

1. Is the flat floor held with screws/bolts/dzus into the frame rails?

2. Have you taken heat into consideration? It looks like you're covered front to back with no airflow for the gearbox or diff.

1. Yes bolts and Dzus Fasteners

2. I am still working on that


I got bored today and built
Splitter/front diffuser
https://www.miataturbo.net/attachmen...ine=1365914447

https://www.miataturbo.net/attachmen...ine=1365914447

https://www.miataturbo.net/attachmen...ine=1365914447

In this pic, are we looking at the top side or bottom side? That is, are the vents bringing air into the enginebay/underbody? Or releasing air from behind the rad?

And by the way,
Attachment 239685

they are front diffusers. they are doing neither, not bringing air nor releasing it. They are used to help channel air between the wheel and wheel well/feed brake ducts.

In the morning I will take some more pics, so you can get a better idea

Here are some more pics, but still not complete

I got the temp of the diff after a hour drive 142 Deg F

https://www.miataturbo.net/attachmen...ine=1366235094

https://www.miataturbo.net/attachmen...ine=1366235094

https://www.miataturbo.net/attachmen...ine=1366235094

https://www.miataturbo.net/attachmen...ine=1366235094

http://i526.photobucket.com/albums/c...ps6a8403fa.jpg

https://www.miataturbo.net/attachmen...ine=1366235094

https://www.miataturbo.net/attachmen...ine=1366235094

I'm going to be building a flat underbody for my miata within the next few weeks, but I have a few questions before I dive into this whole process.

1) My biggest issue is where and how you guys are mounting the panels? I was thinking of mounting the panel over the outside of the frame rails and then on some of the bracing but some more insight on this particular topic would be much appreciated.
2) I see some people having the entire underside covered while others have a channel for the exhaust. What are the pros/cons to each one? If I decide to cover the entire underside, would I have to bend the panel in order to fit over the exhaust or what?
3) What material are you guys using? I've read that 2mm 5052 aluminum is perfect. Is this the correct thickness/grade aluminum?

I'm sure I'll have some more questions once I dive into the process, but this is all I can think of at them moment.

Would it be safe to drill 5 holes on each frame rail and weld round base weld nuts onto them (with the long part up inside the rail and the round base welded on the bottom of the rail)? I have yet to see someone do this, so maybe there's a reason why?

I did mine that way.

1. Mounting it to the frame rails seems like the best bet. On Ryan's car, he initially welded tabs to the frame rails to hold his underpanel.
2. Covering the whole underside would yield the best results, but you'd have to deal with heat from the trans/exhaust/diff. A few well place NACA ducts to feed air into the hot parts would be enough.
3. Material is all up to you. 5052 bends very well if wanted that. CF/foam/nomex core, alumalite are also good choices.
4. I don't see why that wouldn't work, actually I think Moti's underpanel on Morpheus is mounted this way.

Right on, how many did you do on each frame rail and what size did you use? If you don't remember it's not big deal, I'm assuming the size of the weld nut isn't THAT important right?
Right on! Thanks for the advice. I was definitely planning on doing NACA ducts to all 3 mentioned heat spots. What I'm curious about, is the fact that my exhaust seems to be lower than my frame rails. How do people get around this? I'm not 100% positive but i'll have to double check.