emilio700

iTrader: (3)

Visit our website for specs

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It's time?

emilio700

iTrader: (3)

We have just added a new 12.8 lb Street flywheel option for our twin disc clutch. We still offer the 5.5 Race flywheel of course.
The intent of the heavier flywheel was to make it more streetable. More torque capacity than any single 9" (OEM 1.8) disc with a lighter pedal. The twin is a much heavier pedal than a stock clutch but still lighter than the high capacity 1.8 clutches on the market.
As a test, we let the clutch out slowly in reverse up a slight incline, no throttle and the car would chug away on idle control without stalling. The 5.5 flywheel is very easy to stall in comparison.
The other bonus is a huge reduction in NVH. The Race flywheel allows every buzz and rattle to enter your back teeth. It's a race clutch, no sugar coating it.
The Street flywheel feels like a normal 1.8 clutch with light flywheel. Quite, not buzzy. The perk is that it will hold 400 lbs/ft and your SO can drive it.

Simple choice between the two. The Street flywheel is still fast revving, holds torque, is quier and very driveable on the street. The Race flywheel sucks everywhere, makes your drivetrain sound broken except exiting pit lane, revs like a superbike and is godlike on track.

https://supermiata.com/miata-twin-disc-clutch.aspx

Flow

I am currently running an OS Giken TS twin plate. Any mods required to replace?

emilio700

iTrader: (3)

This thread is about the Supermiata Race Twin disc clutch, not to the OS Giken. Probably better if you start a new thread with your question. Good luck with it

Flow

emillio are you suggesting I shouldn't ask if any mods are needed to fit an SM twin plate based on the above existing install? Did you miss understand the question or are you suggesting that I should stick with the OS Giken setup? No real gains to be had to replace in your mind? Understood if so.

curly

iTrader: (25)

He may have thought you were talking about the diff, not many people run the os giken clutch. What’s the total weight with flywheel? If it’s more than 14.6 lbs with flywheel, yeah there are gains to be had.

Flow

I can't seem to find the weight anywhere TBH I would say it is heavier. It might also have a higher torque limit. Any thoughts on mods to the release system (photos above) to swap?

emilio700

iTrader: (3)

I assumed you were asking about disc replacement for the OSG clutch or something. If your question is "what modifications are needed to swap from the OSG twin to the Supermiata twin", the answer is none.
I'm dumb. Got a question for me, make it unambiguous so it is impossible to misinterpret.

Flow

I very much doubt you are dumb emillio, busy maybe. It looks to me that your team have created possibly the best flywheel clutch kit currently available for these cars. Now the English language is the language of business and therefore impossible to make unambiguous! I see the following questions around longevity and support has been touched upon but not clearly answered as yet. I will endeavor to sate at least the questions clearly.

1. How many sessions are you getting out of the two different friction media types you offer currently?
2. When do you anticipate you will run out of stock at the current rate?
3. Have you / when will you place a new order with your suppliers for the frictions discs?
4. Do you expect any issues with resupply?
5. What is the end of support horizon for this product?
6. Are there any off the self friction discs that will work once this product is EOL or will we need to get our own friction media re-bonded?

To be clear the other reasons we need to know this is to help choose between the friction material types and understand how many spares to include in an initial order.

Thanks

emilio700

iTrader: (3)

The puck lasts forever. If you have to replace yours you will be the first. The hybrid disc where rate is tied to usage. If you are doing autocross starts have a lot of power and grip it could wear within one year. For road racing and more sensible use it will probably last forever.

Everything is in regular stock. If we ever decide to stop making them you could get custom discs made.

Flow

Thank you emillio, that spider web of a flywheel you guys have built looks just awesome. My car is way too driveable at the moment with the OGS twin plate...

When you say puck you are referring to the eared center plate not the friction discs, correct?
What has been the feedback on launch control and feel of metal ceramic vs carbon kevlar friction discs?
Can you confirm you have both ceramic and kevlar discs available currently.

Thanks

emilio700

iTrader: (3)

We were actually involved a little bit in the development of the OS giken twin disc. Sean (at OS Giken) was trying to get down to our weight targets but could not come close. In the end I think it did was 21.5 lb compared to our 12.5 lb.

Call Ed on Monday for more info.

Flow

Ed helped clarify the supply and spares availability, par for the course with small companies and specialist products by the sounds. Sean is on vacation at the moment. Looks like the OSG 184mm twin plate is 17lbs all up.

1. What is the reason the site states theses are 14.6lbs all up while they seem to weigh in at 12.5lbs, iis this design evolution?
2. What is the all up weight with the carbon kevlar discs?
3. Is here enough head room to fit sprung discs in the pack?

emilio700

iTrader: (3)

Call Ed

turbofan

iTrader: (1)

...Or send me an email.

Would be surprised if the OSG is actually 17lbs all up.

The answer to question #2 is in #1 (14.6 pounds including carbon kevlar discs, as listed on the desktop version of our site). The previous posts citing 12 pounds for the full setup was for the single disc option which is no longer offered.

Not enough space for springs on such tiny discs. Why do you want springs in a race clutch?

matrussell122

iTrader: (1)

For street cred duh?!?!?

Flow

Good question, I am working with a ME friend on this installation that consults to OEMs on torsional vibration analysis. Essentially we are looking to mitigate frequencies that gearbox resonances amplify from propagating through the power train.
Stating the obvious I know but reliability and consistency is the motorsport holy grail in that to win you need to finish and the smarter we are on harmonics the more force we can apply to a system within setup constraints while maintaining the same reliability stance. Tuned springs/dampers in clutch plates are a known tool in solution kit for this.

Out of interest, have you guys run a laser tach over the drive side of the Race clutch kit?

emilio700

iTrader: (3)

My friend, you are way overthinking this.

Flow

No I don't think so. If one of the setup constraints is the Mazda gearbox then protecting them is a necessary exercise. I have done one my self an know two others that have done 2 boxes in a weekend all with light flywheels and solid clutches. Gains to be had on harmonics for sure.