Front undertray, is this worth the effort?
1 Attachment(s)
Did a search, found lots of undertrays that include a splitter and/or extend rearward of the axle. Thats not what Im looking for.
NASA TT rules state that: 6.4 G 5) Add or fabricate flat bottom/belly tray (rearward of the centerline of the front axle) +5 6.4 I g 1) Undertray/ belly pan forward of the centerline of the front axle For reference, here is the Beatrush panel: https://www.miataturbo.net/attachmen...ine=1333300341 According to NASA rules, Id have to stop approximately where the first line of bolts are, just aft of that actually. A well thought out design could easily come under the control arms too I guess, right? |
Mine stops right behind the first line of bolts and covers more of the wheel wells... but its also part of a splitter, so I have no idea how much effect the under tray would have by itself.
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Bump, anyone? I picked up a big sheet of aluminum this weekend when I finished the cage, I just dont know if its worth the time spent fabricating the undertray...
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I do not know how much downforce that one will generate compared to an all-out plywood splitter. I am guessing less, maybe a lot less. It should help with cooling (radiator flow).
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I bought some aluminum from Lowes and made one almost identical to the Beatrush except it stops at the first two rear bolts. I made one in cardboard first, then cut the aluminum off the carboard template. Definitely made fitting it a lot easier.
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i made mine similar to the beatrush and i feel the difference. i also know there is a positive effect as my mpg went up and my steering feels planted at 65mph+. i doubt you will feel a difference if its a foot shorter. its just not as ideal.
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That one looks pretty good but I'm cheap and I'd make my own.
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Does the one in the OP replace the plastic belly pan? Does it come with shrouding for the sides as well?
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Originally Posted by Twibs415
(Post 862397)
i made mine similar to the beatrush and i feel the difference. i also know there is a positive effect as my mpg went up and my steering feels planted at 65mph+. i doubt you will feel a difference if its a foot shorter. its just not as ideal.
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Originally Posted by ZX-Tex
(Post 862282)
I do not know how much downforce that one will generate compared to an all-out plywood splitter. I am guessing less, maybe a lot less. It should help with cooling (radiator flow).
Originally Posted by dgmorr
(Post 862443)
Does the one in the OP replace the plastic belly pan? Does it come with shrouding for the sides as well?
Edit: This is getting pretty close, minus the splitter portion. http://forum.miata.net/vb/showpost.p...&postcount=496 |
4 Attachment(s)
Subbing for win and fabrication pics when you get this going.
Originally Posted by dgmorr
(Post 862443)
Does the one in the OP replace the plastic belly pan? Does it come with shrouding for the sides as well?
Rev9 sells this thing, check it out: http://rev9autosport.com/nb/engine/b...nderpanel.html https://www.miataturbo.net/attachmen...ine=1334166149 https://www.miataturbo.net/attachmen...ine=1334166149 Yeah, I see no sides. They would be pretty easy to build though |
Are the sides actually necessary?
I'm tempted to just go buy a large sheet of aluminum, and copy their general design with tweaks to support my build (I'd just buy it from them direct if I could, but it's not possible with my IC setup) |
---- it, Im gonna do it. Ill put it on my to-do list after I shake the car down in May. Next track day would be June, so I should be able to compare then.
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This thread has inspired me. I'm waiting for election season to get into full swing so I can steal some coroplast :party:
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I've got an idea for potential splitter material-buy an office chair poly mat and cut to size-it's thin and somewhat flexible and not very expensive.
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Originally Posted by wannafbody
(Post 863619)
I've got an idea for potential splitter material-buy an office chair poly mat and cut to size-it's thin and somewhat flexible and not very expensive.
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Thanks, I wasn't aware of that.
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Originally Posted by EO2K
(Post 862718)
I think gdmorr is asking about the vertical portions of the belly pan, the parts we get to drill big ass holes in for IC tube. My guess is no on the Beatrush, I see no where for it to attach.
Reason I ask is I want to know if I can use just my splitter and not worry about the "thermal suicide" by not having the oem piece in - which has sides. |
Originally Posted by wannafbody
(Post 863619)
I've got an idea for potential splitter material-buy an office chair poly mat and cut to size-it's thin and somewhat flexible and not very expensive.
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For an undertray? Aluminum.
For a splitter? Plywood as it will be much stiffer than a thin sheet of aluminum. For example, I am 170 lbs and can stand on my wood splitter no problem. |
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