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Old 01-07-2011, 04:35 PM   #1
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Default DUCTING plastic material sources?

Ok so the plastic undertray on my car is FUBARD, so is the little airdam plastic thingie that goes into the front bumper helping guide airflow to the rad.

I've seen a few discussions/pictures of people (IIRC dopple and hustley among others) that bought a sheet of plastic/rubber/whatever its called and sealed the mouth of their bumper to the heat exchangers as well as made their own undertray.


Can someone help me find this thread? Basic search doesn't seem to pull up what I'm after.

More importantly, I want to know where you guys got said sheet of plastic.
I've googled around and found a few compnanies that have reasonable pricing (20-40 bux for a 4'x8' sheet of 1/16-1/8 respectively).

Is that a decent price?
Is there a "preferred" place to get this stuff from?
Is 4x8 enough? (from what I measure under the car it def should be)


Any help is appreciated.
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Old 01-07-2011, 05:09 PM   #2
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First, buy a new undertray and airguide. To cover the gaps around the mouth/heat exchangers, I actually cut up pieces of the front inner fender liners I removed. It's a nice flexable plastic that was easy to cut into the shapes I needed. Or are you wanting to make a splitter that will smooth airflow under the nose? I wouldn't say mine is sealed completely, I just put baffles in to help direct the air that would normally flow around the radiator, into the radiator...mostly the air that goes around the sides of the intercooler. The slight curve to the fender liners made for good "scoops" to curve air. It was a opportunistic project...not something I set out to do...just happened to be messing around and decided that seeing the gaps around the radiator weren't so hot.

Currently, I am running the OE bumper and trimmed the OE airguide to fit in there...and chopped the two "uprights" because they looked like **** in front of the intercooler.
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Old 01-07-2011, 05:31 PM   #3
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I believe Genesplicer? had a build thread where it looked like he used flexible shower floor pan liner for his ducting.
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Old 01-07-2011, 05:41 PM   #4
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Corrugated election signs were discussed extensively in one thread about it. Several were using them or that same material with success because it was cheap, light, and strong.
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Old 01-07-2011, 05:53 PM   #5
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I have a roll of abs I need to section off and sell already, had it for years sitting somewhere..hmm i gotta go find it now.
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Old 01-07-2011, 06:07 PM   #6
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Thanx gays,
dopple - I want to avoid buying another undertray and air guide if possible, since I can't find them ANYWHERE for a non-outrageous price. been looking for a long *** time too.
jack - thanx I'll seach for his thread
six shooter - I'll have to look around for those, but somehow I think that those are used more as a front splitter than an undertray? not sure.
brainey - post pics when you can. if you gots wut I needz and for a good price I'll buy it off ya.
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Old 01-07-2011, 06:21 PM   #7
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Old 01-07-2011, 07:00 PM   #8
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https://www.miataturbo.net/showthrea...splicer&page=2
is the page from Genesplicer's build thread where he shows what he did with ducting. lots of photos
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Old 01-07-2011, 07:01 PM   #9
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I think I paid like $55 for a 4x8 sheet of 1/8" ABS a couple years ago. So if you can get it for $40 I say it's a good price.
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Old 01-07-2011, 07:28 PM   #10
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Rosenthal has the engine tray for ~$55 (plus shipping). That's only $15 more than the sheet of plastic you're talking about. Getting the right part would be well worth it to me. The Air Guide is more, and they seem to be tagging NB's for an extra $20. See http://www.finishlineperformance.com...cat=363&page=1

Of course, you may have other reasons to do something custom.

BTW, a nifty way to seal and make custom ducting is to use Red RTV impregnated fiberglass. You do this as follows:
1. Make a sandwich consisting of a sheet of plastic wrap, a healthy squirt of RTV, fiberglass mat, another healthy squirt of RTV, and another sheet of plastic wrap.
2. Knead the Red RTV into the fiberglass mat. Note that so long as you keep the RTV sandwiched between the plastic wrap, it won't be exposed to air and it won't cure.
3. When ready, remove one of the sheets of plastic wrap and stick the exposed RTV to the area where you want to create ducting. During this time, use your hands to shape as desired by manipulating from the side that is still covered by plastic wrap.
4. Cleanup with mineral spirits as needed.
5. Let cure. Once cured, remove the outer plastic wrap. Easily trimmed with scissors/utility knife/razor blade.

I've used this technique to create ducts and cylinder baffles for 200mph aircraft. The RTV impregnated fiberglass stays stuck in place (no connectors needed) and resists serious air pressures. Easily removed by hand peeling. Oil, chemical and heat resistant.

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Old 01-07-2011, 09:24 PM   #11
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Great
Thank you all again for prompt and good info.

I think I'll just get the tray then.
As for the air guide though, I'll make my own.

brain - how big is your sheet and what price? I'll look around locally (to eliminate hassle of shipping) but if I can't find some I'll get yours. PM me
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Old 01-07-2011, 11:14 PM   #12
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Why do you want to do this? Isn't it a street miata?

I still run the stock radiator.
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Old 01-07-2011, 11:22 PM   #13
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Because air that goes around the heat exchangers does literally nothing.

My car is not a track car, and right now I don't have the undertray OR the air guide with no issues at all. Didn't have issues in the summer either (though I never really beat on it when its super hot out, cause I'm paranoid lol), so its not that I don't have sufficient cooling, its that I want to know that my heat exchangers are getting maximum airflow come summer time and 100* temps. JUST in case.

Plus I hate it how when I look into the bumper I can see the ground underneath the car and what not. can't really see it from all angles, but I'm just OCD like that
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Old 01-07-2011, 11:23 PM   #14
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For my ducting I used:

1/32 aluminum
cardboard (for templates)
pop rivits
scissors (for cutting cardboard and aluminum)
aluminum hvac ducting tape

I second buying the tray though.







Not pretty but worked quite well.
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Old 01-07-2011, 11:31 PM   #15
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I would use the coroplast election sign material. I built an rc plane out of it. Crashed it at about 50 mph, readjusted some things and a new propeller and took off again.
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Old 01-07-2011, 11:48 PM   #16
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Old 01-07-2011, 11:51 PM   #17
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FWIW I ran no undertray and stock radiator for 2 years including in the summer.

I don't do top speed runs for hours at a time or anything but with normal highway/wherever whee the throttle is floored driving the water temperature was fine.



Did you get a txt this morning from your miata saying it was lonely or something? Why not... weld up a 4" exhaust for it? :|
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Old 01-07-2011, 11:59 PM   #18
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Quote:
Originally Posted by Scrappy Jack View Post
I believe Genesplicer? had a build thread where it looked like he used flexible shower floor pan liner for his ducting.
That it was - shower pan liner from lowes. Wasn't as stretchy like rubber, but it hasn't fallen apart after a year of tracking it...
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Old 01-08-2011, 12:00 AM   #19
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Quote:
Originally Posted by Faeflora View Post
FWIW I ran no undertray and stock radiator for 2 years including in the summer.

I don't do top speed runs for hours at a time or anything but with normal highway/wherever whee the throttle is floored driving the water temperature was fine.



Did you get a txt this morning from your miata saying it was lonely or something? Why not... weld up a 4" exhaust for it? :|

the ones in the links look sexy but insanely expensive (for me).
also metal tends to rattle if one of the bolts get loose.

this is more for ducting the heat exchangers.
I'm not trying to make a big *** race tub.
I'll leave the 4" exhausts to supra's and ricers.

Quote:
Originally Posted by GeneSplicer View Post
That it was - shower pan liner from lowes. Wasn't as stretchy like rubber, but it hasn't fallen apart after a year of tracking it...
so that's what it is: shower pan liner from lowes?
**** that sounds like it might be cheaper than everything I've considered so far.
going to hit up lowes this weekend lol
any idea how much it cost you?
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Old 01-08-2011, 12:52 AM   #20
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Well then, while you're at it why not make some brake ducting for those slits on the very bottom of your bumper? Please do the R&D for me because I have that bumper too.
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