949 racing clutch longevity?
11-19-2011, 04:26 PM
#22
Rating clutch life is like rating brake pads. One person can run 120k miles on a set of OEM front pads, while another can barely make it 8k or a year on the same set. If 949's is built like the rest of the twin discs on the market, you'll have zero issues. If its built like the rest of 949's products, you REALLY shouldn't have issues with it.
The only issue I can see is with the un-sprung hub wearing the input shaft splines down, but you'll probably make a box of neutrals long before that happens.
The only issue I can see is with the un-sprung hub wearing the input shaft splines down, but you'll probably make a box of neutrals long before that happens.
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11-28-2011, 02:07 AM
#25
That isn't the clutch. That's transmission generated noise that an OEM style clutch with a spring hub will insulate. Put a light flywheel and rigid hub organic disc in your factory clutch and it will make that same noise. Our single makes that noise. Out twin adds floater plate rattle at idle (only with the clutch disengaged). If you want a quiet Miata, don;t even consider our 7.25" setups 
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11-28-2011, 11:20 AM
#27
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Bob
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11-28-2011, 12:07 PM
#29
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Well let me put it this way. I have discovered sprung center clutch disks have a purpose. That purpose is not so much about protecting transmission from shock loading when slamming through the gears in fact I think they make this shock loading worse. What they are for is absorbing the torsional vibration of the reciprocating power source and reducing drivetrain noise.
Honestly I think the single worst thing I did to my car to make it less pleasant to drive as a street car was the Un-sprung clutch. I got sick of blowing the sprung centers out of clutch disks however.
Bob
Honestly I think the single worst thing I did to my car to make it less pleasant to drive as a street car was the Un-sprung clutch. I got sick of blowing the sprung centers out of clutch disks however.
Bob
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11-28-2011, 12:25 PM
#30
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Who wants to roll around and take audio of their twin disc for me? I ask because I think my Spec clutch is dead and I have to make a decision and get this car running before I get laid off, lol. Running car + unemployment ; tuck in storage : broken car + unemployment ; part-out.
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11-12-2012, 05:28 AM
#39
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I recently bought an imported mazda miata and the previous owner installed a 949 Racing Twin Plate Clutch & Flywheel. The owner said that the noises that it makes off the throttle were fine and due to his reputation i believed him (he knows one of the guys from mx5 mania here is australia).
I dont understand alot about why the metalic grinding sound happens in the over run between gears and i am really interested to learn why. I was reading through the thread and believe its a quality product but im slightly worried about that the sounds is doing more harm then good?
i read that
"What they are for is absorbing the torsional vibration of the reciprocating power source and reducing drivetrain noise"...
but how are they reducing drivetrain noise?
also
"The only issue I can see is with the un-sprung hub wearing the input shaft splines down, but you'll probably make a box of neutrals long before that happens"..
are the input splines the source of the noise?
I dont understand alot about why the metalic grinding sound happens in the over run between gears and i am really interested to learn why. I was reading through the thread and believe its a quality product but im slightly worried about that the sounds is doing more harm then good?
i read that
"What they are for is absorbing the torsional vibration of the reciprocating power source and reducing drivetrain noise"...
but how are they reducing drivetrain noise?
also
"The only issue I can see is with the un-sprung hub wearing the input shaft splines down, but you'll probably make a box of neutrals long before that happens"..
are the input splines the source of the noise?
Last edited by mx089; 11-12-2012 at 05:38 AM. Reason: i thought i pushed personal message, whoopsie
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11-12-2012, 07:19 AM
#40
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twin plates make lots of noise. It's just natural, it sometimes sounds scary. I used my first twin plate in my FD and it was a little hard to get used to sound wise. Engagement was awesome though.
And here you go young Padawan.
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And here you go young Padawan.
Virtually all street clutches also employ what is called a Marcel spring between the two facings of the clutch friction material. This is a very thin, wavy spring that also helps to damp the chatter of the engaging clutch. Race clutches do not employ a Marcel spring and can be very harsh on the street as a result.
All dual-disc clutches must employ a midplate or floater secondary flywheel surface that is attached directly to the flywheel. It provides a flywheel surface connected directly to the crankshaft for the secondary clutch disc. This surface must float when clutch pressure is released (clutch pedal depressed), which is where the device gets its name. With this Centerforce unit, the floater is connected to three large drive pins located on the flywheel.
All dual-disc clutches must employ a midplate or floater secondary flywheel surface that is attached directly to the flywheel. It provides a flywheel surface connected directly to the crankshaft for the secondary clutch disc. This surface must float when clutch pressure is released (clutch pedal depressed), which is where the device gets its name. With this Centerforce unit, the floater is connected to three large drive pins located on the flywheel.
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