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Old 06-24-2016, 12:26 AM   #1221
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Quote:
Originally Posted by lightyear View Post
The wing is pretty much the same as this one.

Project Mazda RX-8 - Modified Magazine
I see you have started a new wing, is this reference to the new one or the old one? SM has a new wing to compete with the S1223, which I use, supposedly with lower drag for same lift (DF). Comparing his data, the new wing (132) is a much better choice than the 183, by implication the S1223 would also be better that the section chosen in that article. It is hard to make comparisons when one section is proprietary though.

That is a serious splitter, you are going to get much better front end grip out of that!

Quote:
Originally Posted by motormechanic View Post
the COT profile makes decent downforce and is low drag.
Yes. I think Zozzy has posted here, first time out with one he knocked off a 12 year old lap record, with no testing and the wing set at 0 deg.
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Old 06-24-2016, 12:56 AM   #1222
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The 183 is the wing I am using now. I will see how it goes on Sunday now that the front might keep up.
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Old 06-25-2016, 07:38 AM   #1223
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I misread a post on your thread as you starting a new wing, it was someone else said that. If you have access to McBeath's profiles, the 132 would be the better profile than that one if you do start a new wing. If you don't, the S1223 would be my pick but I would be interested in any other suggestions from other people.

COT would be another option, but unless you buy one, as far as I can see nobody really knows what profile it is, there are a few guesses but nothing definitive.
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Old 06-27-2016, 05:34 PM   #1224
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I started the day with the wing at zero degrees, and kept increasing AOA until the rear edge of the wing was slightly above the end plates. After that, I drilled new holes in the front to lower the front edge to increase the angle to 12 degrees. Top speed dropped about 3mph. But it set its fastest lap time of 1:43.8. Equal lap time to many big dollar V8 race cars.
The pics are from the morning at zero degrees angle. The front springs are more compressed than the rears, so the front splitter/undertray is working very well. Last lap in the last session - the front splitter mounts let go. The bolt heads ground away underneath causing the right side to be unsupported, then the middle alloy tube snapped at where I bent it (weak point) from the extra weight on it. I have a solution, and will have it ready for Saturday.









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Old 06-27-2016, 05:36 PM   #1225
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Old 06-27-2016, 06:21 PM   #1226
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Good to see the addition in the front prove itself for you. I hate trimming out rear downforce just because there isn't enough in the front to capitalize on it. That 3 mph loss at the top is verrrrry worth it. Make stronger mounts, continue winning.

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Old 06-27-2016, 09:16 PM   #1227
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I just did some research. I am pretty sure I have recorded the fastest ever lap of Phillip Island in an MX5 (Miata) of any configuration. Let's see if I can go faster on Saturday.
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Old 06-27-2016, 09:36 PM   #1228
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Quote:
Originally Posted by lightyear View Post
I just did some research. I am pretty sure I have recorded the fastest ever lap of Phillip Island in an MX5 (Miata) of any configuration. Let's see if I can go faster on Saturday.
NEEDS VIDEO!
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Old 06-27-2016, 09:54 PM   #1229
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Well done, congratulations!!! I look forward to the video, especially the bit around Lukey!

I am surprised that you only lost so little top speed. What was your baseline, and was that at max AoA?

Are you planning on changing the front springs, or otherwise stiffening the front end, to reduce the rubbing? Maybe just a rubbing block in front of that attachment if time is short?
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Old 06-28-2016, 07:56 AM   #1230
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Lukey is fun, it still has the *** hanging out if I push it a bit too far. It's fun. I haven't seen the video myself yet. I must get onto that. I hope the video looks as exciting as it feels from the drivers seat.
Starting with the wing at zero, I actually picked up speed at around 5-6 degrees. There was a tailwind that may have influenced the data. But it wasn't that windy. And if anything it should have kept the same speed, as the tail wind would have canceled out the extra drag.
Spent a bit of time today making camera mounts under the car, and some measuring devices. So come Saturday we should have a lot of info.
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Old 06-28-2016, 05:05 PM   #1231
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Here is a lap from the slower group session.
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Old 06-29-2016, 09:49 AM   #1232
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That looks like so much fun...
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Old 06-29-2016, 05:32 PM   #1233
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It is the best track. Very fast and flowing. I don't like going to other tracks after going to Phillip island. You don't get the same feeling of speed anywhere else. Top speed is 140mph, T1 minimum is 120mph. Cars like Skylines, etc with bigger HP are up around 160-170mph top speed.
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Old 07-11-2016, 05:47 AM   #1234
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Has anyone found a good source of the HDPE Plastic Roll in the UK?

Shipping from Speedway is about $99 making it a bloody expensive way to do it!

I have tried eBay, amazon, all the usual sources, but it just doesn't seem to exist over here (or I am a moron, one of the two)/

Thanks

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Old 07-11-2016, 04:13 PM   #1235
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E.g "Allstar Performance Protective Plastic Sheet" on Demon Tweeks
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Old 07-12-2016, 12:10 AM   #1236
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Default Hood vents and canards/spats






Not 100% diy.
I bought the vents off an auction site, cut the holes, painted them, cut the hood and fitted them.

As for the canards/spats, I bought a cheap mold (auction site) and made them out of frp (white gelcoat) then painted them body colour.
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Old 07-12-2016, 05:11 AM   #1237
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Quote:
Originally Posted by NiklasFalk View Post
E.g "Allstar Performance Protective Plastic Sheet" on Demon Tweeks
Niklas

Thanks for that! For some reason I didnt think to check Demon Tweeks!

Its listed as 2MM where as the Speedway stuff is listed as .11" which works out at 2.7MM.

Will 2MM be strong/thick enough for use as an airdam?

Thanks

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Old 07-12-2016, 12:14 PM   #1238
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2mm =.080", a bit too thin for an airdam. Next size is .118" IIRC which works out to about 2.8mm
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Old 07-13-2016, 05:16 AM   #1239
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Emilio

I thought as much.

I guess I will keep hunting. Bizzare that something so readily available in the states, just doesn't seem to exist over here.

I have even called a bunch of plastics suppliers and while they do HDPE sheeting, they dont have any flexible enough to be rolled.

Thanks
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Old 07-13-2016, 06:34 AM   #1240
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3mm sheet of this then?
Polyethylene Sheet HDPE 2mm-3mm-4mm-5mm-6mm-8mm thick
Even if they don't normally shop in rolls you can probably ask them to roll it up for shipping.

The 2mm roll I have would probably work as a airdam with suitable support (it's not flimsy by any means), but a thicker one would be sturdier of course (and give a smoother look).
It's working well for generic patchworks though
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