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carbon/kevlar clutch kits...

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carbon/kevlar clutch kits...

Postby gse_turbo » Wed Mar 19, 2008 7:35 pm

Well we finally have most of the clutch kits sorted out...

Right now we have 8.0" 1000lb pressure plates for the "flat" (.080" step) and 8.5" 1200lb pressure plates for the "pot " (.787" step).

The disks are avialable in 8.0" and 8.5" carbon/kevlar for both the 1"-14 and the 13/16(3/4")-24 input shafts.


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Postby mocpac » Thu Mar 20, 2008 12:55 am

can you explain this in rice & beans?
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Postby exist3nce » Thu Mar 20, 2008 1:47 am

hehe I'm already on board for this behind the scenes....... but those are the first pics I've seen. Looks pretty nice.
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Postby greenbluewoo » Thu Mar 20, 2008 3:47 am

how much power would these handle
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Postby Pir0 » Thu Mar 20, 2008 9:26 am

I'm with mocpac here. I've a general understanding why these are better, but, could you go into it in a bit more detail?

Their frictional force is greater right? Do they munch up the flywheel though? Would i be best going for a better flywheel too? And do they last longer than a normal clutch, driven in the same way day in day out?

Cheers man, Paul.
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Postby gse_turbo » Thu Mar 20, 2008 4:55 pm

These are really good questions, I'll try and answer to the best of my ability but it you have about 10 minutes check out this video from Fidanza, they really didi a good job explaining the system.

This can also be found in the transmission section under Re: the "NEED TO KNOW" from Fidanza... Clutch Kits


Pir0 wrote:•Their frictional force is greater right? YES, because of the way this material reacts to pressure and heat the clamping ablilty is much greater than the OE organic disk.
•Do they munch up the flywheel though? NO, the C/K disk is very friendly to both the flywheel and driver. You'll never see the danamge that a ceramic disk causes with this kit.
•Would I be best going for a better flywheel too? NO, I always recommend a better flywheel but for engine performance reasons not because it's required
•Do they last longer than a normal clutch, driven in the same way day in day out? YES, The materials are very durable and would far out last the OE organic.

NOTE: Even thought the materials are far more durable than the EO type the disc can still "burn up" or glassed it just takes more abuse before it happens.

Cheers man, Paul.


greenbluewoo wrote:•how much power would these handle? This disk is good for around 275-300hp without a problem it's the pressure plate that will limit the power more than the disk.


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Postby Nubaroo » Fri Mar 21, 2008 11:11 am

Just a bumb question - in the video they refer to the "4puck" clutchplate as a kevlar type - from the colour on it, it looks like a copper clutch??? Can anyone explain the difference in behaviour between a copper and kevlar type??

Also what is the cost on one of these kevlar kits????
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Postby PrecisionBoost » Fri Mar 21, 2008 3:55 pm

Kevlar is yellow in color....which is what these pucks look like... copper is usually darker.

Don't quote me on this but I belive Kevlar has a better "slippage" than copper/ceramic.

That is to say a Kevlar clutch is streetable because it has a small amount of slippage before grabbing where as most of the copper/ceramic clutches just grab and stick.... making it hard to start off in 1st gear... and you tend to get chatter.

I'm pretty sure the copper content is there not so much for a friction coefficent as it is to help distribute heat (get rid of hot spots) and increase the overall temperature handling characteristics of the clutch.
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Postby gse_turbo » Fri Mar 21, 2008 4:31 pm

Chris said it best...

these complete kits are $265.00 plus shipping.


we will be working on several other clutch kit "Stages" that should be ready very soon. if there is an application or type of disc you are after feel free to contact me.

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Postby xiaogary » Mon Mar 24, 2008 4:18 pm

how abt 7.5 inch with 7/8 X 24 spline?
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Postby Nubaroo » Mon Mar 24, 2008 7:48 pm

any idea what the shipping costs would be to SA???
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Postby gse_turbo » Tue Mar 25, 2008 5:49 pm

Nubaroo wrote:any idea what the shipping costs would be to SA???


I think it would be around $50 or so but I would have to double check that.

xiaogary wrote:how abt 7.5 inch with 7/8 X 24 spline?


I'll double check to see what sizes hubs are available but I think the 7/8 24 might be a long shot.

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Postby Pir0 » Wed Mar 26, 2008 11:37 am

That vid is good. But, in everyday driving with the odd burst of harsh driving, how long would these last? I\ve heard carbon clutches do last a lot longer than normal clutches, probably because there's less slippage in the bite? Any ideas on this?
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Postby gse_turbo » Wed Mar 26, 2008 5:41 pm

the advantages in the carbon/kevlar disk is that the carbon and kevlar both have great bite but the biggest advantage is that the kevlar has fantastic cooling properties which is where most of it's long life comes from.

this disk is perfect for the type of driving you described, it's what the disk is made for. the description you gave provides a good rule of thumb and here is how it would break down.

0% race/100% daily driver/commuter car = full "fibertough" or OE organic type disk
70% street/30% drag or road racing under 350hp = full carbon/kevlar, marcel, sprung hub
50% street/50% drag or road racing under 600hp = 4 puck kevlar, no marcel, sprung hub
25% street/75% drag or road racing under 700hp = 6 or 9 puck kevlar, no marcel, sprung hub
25% street/75% drag racing under 700hp = ceramic 4 puck, no marcel, sprung hub
0% street/100% drag racing under 800hp = ceramic 6 or 9 puck, no macel, sprung hub
0% street/100% drag racing over 800hp = ceramic "button" type, no marcel, no sprung hub

these figures are approximations and the complete system (flywheel and pressure plate) will have an effect on how a disk will apply to the chart.

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Postby Pir0 » Thu Mar 27, 2008 12:51 pm

That chart is exactly what i was looking for.

It also seems this is the clutch I want :P Might be a while before i get one though. But it sounds perfect for what I need.
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