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3rd splitter, and most likely not the last.
Dollars spent: Materials for Splitter: ~$600 + ~$60 consumables Materials for mold: ~$250 Hours spent: Plug: ~6 hours Mold: ~6 hours Finished product: ~10 hours How effective: Testing next week Materials used: Plug: Coreflute x 2 layers of 3mm 2 layers of 225 fibreglass with vinyl ester resin Standard house filler for some shaping 1 layer fibreglass weave cloth Mold: ~700g of tooling gelcoat 1 layer 225 fibreglass 2.5 layers of 450 fibreglass (mistake should have been more) Massive wooden board for flange and layup. Finished product: 2 layers of twill weave (normal looking CF, top and bottom layers. 2 layer of 411, double bias CF (might have that wrong, but it has the weave going both ways and is thicker) 1 x 3mm coremat strip of CF Kevlar around the outer edge Multiple layers ~8 of CF around outer edge to match core. Bracket location: See picture Tracks tested on: To be tested on Lakeside (QLD) on 5/6 Dec Race/TT class built for: 2B (cams)/Time attack I don't know if the design will work, and there are some points about it that I will change in the next version. 1) the rise goes into half the steering rack, 2) rises on either edge to go into the wheel wells 3) take more time on plug and mold to get a better finish. This was my 3rd attempt at vacuum infusion, the places I fell down for the end result were in making a quality plug and decent mold. The underside came up great though. I think the strength will be adequate, feel quite stiff. I had planned to use an additional two mounting points on the front but after bolting up the rest I decided to try without. I will update with how effective it is if all goes well next weekend. Canards posted previously didn't get to be tested properly as there were some issues with the car. (caused by me.) |
You did a great job. It might be better to have the middle straight , and the area in front of the wheels curve up.
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Here is my aero for my road/track car Lightyear Fastback and spoilers.
https://www.miataturbo.net/attachmen...ine=1448710236 upload img |
Im still waiting for you to do a production run of those fast backs :)
I'm going to make another splitter, especially since cams just changed the 2b rules to allow 100mm out the front. It will have the rises as you advised instead of the middle. |
Nice work with the carbon Tim. One of the keys to an effective diffuser is to carefully manage the air's path and exit. You want the air accelerating out of the diffuser. Easy peasy when the diffuser's at the back of the car, less so when it isn't. That's why diffusers in the side portions of the splitter are most common; it's relatively easy to guide the air into the wheel well and then out to the side of the car with a few elements. Pointing the diffuser exit at essentially a wall like the subframe/steering rack is a lot less ideal.
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I've been stressing over this design but I had come to far to change it. I learnt a lot during the actual layup and infusion of this one so I'm not to stressed about it not being the perfect design. (Obviously I would have much preferred to nail it straight away though)
I think I originally intended to try and get all that air out from just behind the front tyres, but with no modified fenders and side skirts that direct air out it is sort of pointless. I'm tossing up the idea of creating a quick fix air guide that will flatten out the middle and push the air out to the sides quite aggressively but I will probably not have the time to achieve this prior to testing this weekend. The one thing I'm taking comfort though is after comparing this splitter and the first one I had, I'm confident that even with the path I have the air flowing now it should still be more effective than the first, and it worked quite well. When I start the next I will post progress pictures so I don't make the same mistakes of the last. Thanks for your feed back guys :) |
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For those of you that run a notch or step in the front profile of your splitter - have you ever done any A/B testing vs. a splitter with a perfect curve or straight edge? I'm thinking having the step may help prevent me from stalling under heavy braking, and that having the extra lip out front may not be doing much at the radiator inlet area anyways, but was curious as to hear your thoughts.
Example would be Doran's old splitter: https://www.miataturbo.net/attachmen...ine=1448810425 |
Are you bottoming out the splitter under high-speed braking?
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Not sure how new setup will work, but its a possibility given that the car is softly sprung for hill climbs (particularly at two tracks that have long straights and everything you've got braking zones). I know I can put wear strips under it to prevent that as well, but wondering if there is any inherent benefit in a stepped design.
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Day one of testing done.
Initially the car had some over steer, I got quite excited as I'm sure this meant the splitter was working. Dialed in some more wing and car felt great. I would say the turn in felt as good if not better than it was with splitter v1 and an open diff. Sadly my data logging system (aka phone) decided to not work right so no accurate or to be trusted speeds or sector times :( Still 1.2 odd seconds off PB, but there is always tomorrow. In short: How effective: 3 - did what I wanted so far |
Originally Posted by midpack
(Post 1269266)
Everyone's favorite plywood splitter. Extends 5-6" from the bumper.
https://www.miataturbo.net/attachmen...ine=1443063558 The same off bent some of the rear subframe braces so all things considered, I'm happy. https://lh3.googleusercontent.com/--...206_110616.jpg I was right at 2 seconds slower without aero on Road Atlanta. After the off, I removed the CoT wing and ran naked for 3 more sessions. 1:44.76 with aero 1:46.69 without |
that splitter did look beastly
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A copy of it is going back on. If I rip that one off, I'll see about a more solid mount like what some of you guys are running.
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Originally Posted by midpack
(Post 1290592)
I was right at 2 seconds slower without aero on Road Atlanta. After the off, I removed the CoT wing and ran naked for 3 more sessions.
1:44.76 with aero 1:46.69 without |
Originally Posted by midpack
(Post 1290608)
A copy of it is going back on. If I rip that one off, I'll see about a more solid mount like what some of you guys are running.
I like the idea of a weak point that is built in, in order to fail - saves more expensive/difficult repairs. Mine is the attachment between the splitter and the mount (a piece of relatively light ally angle), like yours is/was. |
Originally Posted by endura
(Post 1290726)
good data point. surprised it's not a bigger gap (re.aero/no aero) on a high power miata/very high speed track.
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Sexy
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WOW< first NC I have seen that I really like, very nice!!!
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