twin disk questions...
 

Bought a used twin disk and it looks to be in great shape. Can you supply the specs for the disks so I can check wear to see if they need to be changed.

Thanks

Metallic or organic? Are they close to the rivets?

Look organic.

Not really close, but Id like to be more precise than that. lol

You can't buy new organic discs. You have to get them resurfaced. I got mine resurfaced. The material that was used for mine was was .125" material on both sides. With an overall thickness of .308. I would expect new to be somewhere close to that. The rivets take up a decent amount of that material too.

Can you buy any new disks for it? Where you get them resurfaced? What was turn around time and price.

thanks!

You can buy new ceramic discs. I had mine resurfaced at a local friction shop. Cost $60 and had a couple day turnaround time.

Wow thats cheap.

I dont see the ceramic disks on 949 page, they the ones that sell it?

Whats pros and cons of ceramic and organic?
Your car a street car? What kinda power?
Now is its manors?

I'm planing a 350whp street car. I'm talking Ac and PS and all the happy things in life.
Comphy clutch is a must.

Organic is hard to drive on the street. Ceramic is impossible. I love it. The shifting is fucking amazing. Would not run a ceramic on the street. Organic is hard enough already.

Replacement Discs for SuperMiata 7.25" Race Clutch

IMO it's not a comfy clutch. Not compared to OEM. I haven't driven anything else though. I know Emilio and savington praise the organic for its Street manners.

The flywheel is so light and the MOI is so small that it takes getting used to. I've had it for a few months and I still stall every few times I drive it.

I see, ran a 4 puck unsprung in a my chumpcar and yea it sucked. Def not a street car thing.

Now to find a place locally to resurface these things. Never heard of anyone local doing this.

Thanks for the help bro

Look for truck supply places. Anyone who can reshoe drum brakes or rebuild truck clutches.

You bought a racing specific clutch for a street car. How you can expect it to be "comphy" and have street manners is beyond me.

Ive driven street cars with much worse, trust me. I have a 700+ whp Foxbody in the garage. Just know any 400 whp miata are on borrowed time on a single disk.

Try to keep the total thickness below .290 if you want it to release smoothly. Thicker than that and it will be prone to drag until its got quite a few hours on it.

^^good to know. Mine didn't have that problem, but I also had the flywheel turned. Just scuffed up the floater plates though. Couldn't have them turned where they did my stuff.

Thanks.

I imagine it's a standard miata pilot bearing?

Yes.

Speedsport probably would have been a better choice for the intended use. Clutch was magical, not as hardcore as the 949 MOI wise but stupid easy to modulate without much pedal pressure and didnt mind if you totally nuked it. I have no idea why they made a steel street version of that clutch the one that was like a pound heavier than the 949 was easier to drive in traffic than the oem wrx clutch. They dont seem to be in business any more.

IMO the only issue with the twin disc is the very small engagement range. This is an unavoidable problem because it is plug and play. The only way around it is a trick hydraulic TOB or different clutch fork setups. I've been toying with the idea of trying it because that's the only thing that bothers me on the street.

Measured and its almost new! yea.

One could move the fulcrum of the fork towards the shaft centerline increasing the leverage ratio, effectively increasing engagement range. FWIW, we have not given up on organic or hybrid discs for the twin. We are working on a possible solution now.

:love:

I will buy a set as soon as they are available. I want a spare set so I can swap them out instead of having the car down for a week.

Tilton's method of changing the ratio was to create two different pressure plate floater disks. The ring on which the pressure plate spring fingers pushed was moved radially inward or outward depending on the need for travel or clamping force.

What you have to be careful with is overstroking the springs because they can and do crack. Better to trade a little clamping force than risk a busted pressure plate diaphragm spring.

What about extending the clutch fork and spacing out the slave cylinder. Not sure how much room there is down there but you could theoretically add some travel that way.

Heel plant
 

That would have the same effect. I just get used to the short pedal travel and prefer it that way. Faster shifts. One trick is what I call a "heel plant". Instead of modulating clutch with your calf by raising your entire leg, you plant your heel on the floor and modulate with your ankle like you do with the throttle. Problem with leg method is when the car starts to move, your leg stays put, releasing pressure, further engaging clutch and.. stall. By planting heel your foot stays put relative to the pedal when the car jerks forward. You quickly get used to it and can actually modulate comfortably while car is shooting forward. Only works with short pedal travel. Heel plant won't work with OEM style long pedal stroke.

Yep, i've read all your comments about that. Its very helpful. And i love the short travel on the track its freaking amazing. But this is really a street car over a track car. Thats my only issue. I have started to get used to it though. Definitely a learning curve. I'm also wearing boots 90% of the time. And you don't get the best modulation in those haha.
My gf drove it last night for the first time and didn't stall it once.

I've been dailying the ceramic twin disk (8-5 job to go to, M-F in a major metro area, ~90 miles a day through downtown), and I've gotten pretty happy with it. It's perfectly possible to modulate smoothly from a start, just difficult.

Incredible fun, as well. Shifts without delay, makes rev matching downshifts absolutely wonderful.

...interested in future organic disks still. :P

What is the status of the new organic disks?

Subbed for reply
Greg

The website will show "in stock" and you will be able to add to cart when we have them. No ETA. Just check the site once a week or so. We won't update every thread on every forum worldwide about our twin.
Easiest to bookmark the product page on our site.

Replacement Discs for SuperMiata 7.25" Race Clutch

I'm more after a complete clutch with disks and have been keeping an eye on your site.
late last month you said 4 weeks, now it's no ETA again....

The twin ceramic has been in stock. Waiting on the first batch of Kevlar/Carbon discs. There will be no organics again for the twin.

Production Kevlar/carbon? Or another prototype. If production is there any info on longetivity or torque capacity vs ceramic?

"Full disclosure, we found a new source for the much-loved organic discs and put them back into production. We should have them in stock within the next four weeks or so."

So this is not accurate?

Reading comprehension. Its hard :D

Conflicting statements from the same person, just trying to get a straight story.

.

The non ceramic was generically referred to as the "organic" during development. The final production discs are Kevlar/Carbon though, not traditional organic material. Just semantics. Apologies for any confusion.

Thanks for the hate though, much appreciated!

Any comments on the drivability of the new carbon/kevlar discs? (Or a link to a discussion about them that I may have missed?)

Fawesome

Awesome. I'll keep an eye on the site.

No hate, just trying to get a straight story.