mx5-kiwi

As I have accumulated a spare 6 speed, diff, engine/turbo, wheels etc I have decided this years project is a new race only "lightweight" chassis to supplement the current, fully road legal, 960kg race car.

I have already sourced glass guards, boot and race roof and found Carbon Miata for light doors (though I may just trim some OEM ones down...).

http://www.carbonmiata.com/index.php...product_id=111


Only thing I am having trouble with is a nice one piece nose.

I am not sure of the Carbon Miata one (in a kit they dont actually make themselves but presume they could do nose only)...

Looking for alternative suggestions.......

18psi

iTrader: (76)

search for threads/posts made by lightyear
he is making some crazy carbon racecar stuff including what looked like a full on miata carbon body. he might help you out

ThePass

iTrader: (3)

Keep ease of use and service in mind when considering this. A full front shell can be a real pain sometimes, there is no more 'popping the hood' to check something quickly. Every time you need to check fluids, etc. means pulling the entire front off the car. If I was having something made custom, I'd do front bumper and fenders as one, leave the hood separate and put the hood skin on four pins.

mx5-kiwi

Heck no, that would be a pain in the butt!

Just mean the front bumper, headlight area in a one piece with air dam integrated.

Something like this, actually this is almost the one I would prefer...

ThePass

iTrader: (3)

Oh, well that's just an aftermarket front bumper. Aero for that one isn't as good as the "Production" style ABS add-ons, and nobody AFAIK makes a full replacement bumper with a lower portion that mimicks the production airdams. Can't tell from the pic, are the headlight lids part of the bumper on that one? I'd prefer to have the lids attached to the hood so they lift away.

mx5-kiwi

headlights are seperate. Just a bolt on nose/bumper/airdam.

Quite handy as they are easy to remove in one piece for front end access, trailer clearance etc.

Just need to find a supplier....

Double O 86

See if Andy's Auto Sport has something you like.

mx5-kiwi

Awesome, thats perfect.

Found one and tried to buy it, on sale for $122.00 US $. Amazing....

Freight $1400.00 US $......WOW, that sucks :(

Oh well have emailed them about freight, also found a local company that makes a similar one so on track now thanks everyone.

Double O 86

So, where's my "poscat"?

mx5-kiwi

Didn't even know how that worked until you said it, now I notice 2 cats on the post, amazing!

So you got 2

Double O 86

Thanks, mate. And here's two for you.

asmasm

iTrader: (1)

You should be a little skeptical of the weights carbon miata quotes. Their parts look nice, but they have a habit of quoting stock part weights wrong.
Hood:
"against 9 Kg (19.5 Pounds) for the OEM one."
I weighed my OEM NA hood at: 7260g (with fasteners, no hinges).

Fender:
"compared to the 3.3 kg/side for the metal fenders"
I weighed mine at 2960g


Also, contrary to popular opinion, there is significant weight to be saved in a well made carbon hood. I am planning to do one for my car and it breaks down like this:
https://i.imgur.com/wsSrcsr.png

If I have to add a fourth ply of carbon that will add about 1 lb.


Lastly, the stock bumper is pretty heavy, even after removing all of the bumper support foam and brackets, it comes out to 14.2lb.

mcfandango

iTrader: (1)

Cheap busted OEM bumper. Sawsall. 1/8" ABS sheet. Your choice of splitter material.

Can't find a good pic of the splitter support. Used 1/2" steel square tube, some aluminum angle riveted to the splitter and hitch pins to tie it all together. Note this is autox only. I'd do it different for real speeds.

Blackbird

The air needs a way to escape the two traps laid up front.

mcfandango

iTrader: (1)

It is open at the rear. Just dumps into the giant tire behind it. Not ideal but seemed to work. I'm sure it could be better.

Blackbird

It'll be better to cut up the end plate and not to dump onto the tire.

ThePass

iTrader: (3)

Start the front edge of the dive plane on the splitter and curve upwards steeply to about where that existing one's top/rear point is. Voila, tire spat. At autox speeds you're not really focusing on creating vortices along the body, which is the primary purpose of small canards/dive planes. What you do want is to direct air up and over the single largest cause of drag (front tire extending past bumper).

Digging the fun endplates that remind me of an F-117 Nighthawk though

mcfandango

iTrader: (1)

Version 1 had no where for the air to go (closed at the rear). This seemed to work just as well. Constraints are the limited area for the canards and end plates. Main focus was on strength for version 2. It is all getting rebuilt again this year.... after I get finished jamming the LNF motor in.

Rear endplates were inspired by winglets and trying to force as much air under the wing as possible.

Gee Emm

I thought you wanted lower pressure under the wing, wouldn't that mean directing the air anywhere else but under the wing?

Tell me what I am missing here please ...

mcfandango

iTrader: (1)

You have to have some airflow under the wing for it to work. Given I'm only allowed to have the wing be 12" off the mount surface, that is pretty limited. Get air under, let airfoil do its fairy dust magic thing.

Another source for the idea is the endplate testing others I know have done. The found grabbing air from along the body side helped. At least from the strings taped to the body standpoint.

*thread drift! I guess I should open a thread for the car. Or at least stop cluttering this one.