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Old 11-27-2015, 01:53 AM   #981
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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.)
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Last edited by Tim_Aus; 11-27-2015 at 02:09 AM. Reason: added pictures of construction.
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Old 11-27-2015, 03:52 PM   #982
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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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Old 11-28-2015, 07:30 AM   #983
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Here is my aero for my road/track car Lightyear Fastback and spoilers.


upload img
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Old 11-28-2015, 05:37 PM   #984
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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.
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Old 11-28-2015, 09:05 PM   #985
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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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Old 11-29-2015, 02:48 AM   #986
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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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Old 11-29-2015, 11:20 AM   #987
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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:


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Old 11-29-2015, 03:35 PM   #988
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Are you bottoming out the splitter under high-speed braking?
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Old 11-29-2015, 03:57 PM   #989
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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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Old 11-30-2015, 07:35 PM   #990
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Dollars spent:
Fiberglass: Free
Resin: $13 a/gal
Clay: $30
Kevlar: Free


Hours spent:
Trunk Delete:3 hours
Aero Fenders: 7 hours


How effective:
Not going to test until the engine swap is done, by then there will be alot more done in terms of aero. So How Effective: will never know

Materials used:

Trunk Delete:
1/2 yard of 36/10 fiberglass
1/2 gal of resin
Left over fabric
3M Spray Tack

Aero Fenders:
20 lbs of Clay
3 yards of Kevlar
1/3 gal of resin
Aluminium foil
Cling Wrap

Trunk Delete (double diffuser)












Miata Aero Fenders:













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Last edited by 1993ka24det; 11-30-2015 at 07:52 PM.
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Old 12-05-2015, 04:34 AM   #991
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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
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Last edited by Tim_Aus; 12-06-2015 at 05:00 PM. Reason: added pics
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Old 12-09-2015, 04:52 PM   #992
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Quote:
Originally Posted by midpack View Post
Everyone's favorite plywood splitter. Extends 5-6" from the bumper.
Ripped the splitter off at Road Atlanta this past weekend with a shortcut between turns 3 and 4. Bottom of the intercooler has a pair of small dents from the front mounts and the rear tabs used for the stock under tray are bent backwards. Front mount ripped through the slotted angle, side mounts ripped carriage bolts through the plywood, rear ripped bolts through plywood and bent the subframe mounting point.

The same off bent some of the rear subframe braces so all things considered, I'm happy.



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
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Old 12-09-2015, 05:03 PM   #993
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that splitter did look beastly
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Old 12-09-2015, 05:24 PM   #994
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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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Old 12-10-2015, 01:15 AM   #995
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Quote:
Originally Posted by midpack View Post
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
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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Old 12-10-2015, 04:18 AM   #996
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Quote:
Originally Posted by midpack View Post
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.
Better solution might be to stay on the track . Seriously, think about what you want to damage (ie fix) next time. Strengthen the splitter, it will bust the mounts. Strengthen the mounts, it will bend/bust whatever the mounts are fixed to.

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.
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Old 12-11-2015, 11:19 AM   #997
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Quote:
Originally Posted by endura View Post
good data point. surprised it's not a bigger gap (re.aero/no aero) on a high power miata/very high speed track.
without the areo he probably went faster on the straights. Road ATL is all WOT for 2/3's of the track.
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Old 12-13-2015, 12:27 AM   #998
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Old 12-13-2015, 12:33 AM   #999
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Sexy
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Old 12-13-2015, 01:18 AM   #1000
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WOW< first NC I have seen that I really like, very nice!!!
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