Does anyone make a non-sac organic street clutch? - The Unofficial BMW M5 Messageboard (m5board.com)

beegeezy · 20th December 2007, 09:14

I did some searching but I couldn't find any definitive answers. I see UUC makes a non-sac style replacement clutch. Does anyone else make one thats longer lasting? I won't be doing any major power increasing any time soon. I like the idea of getting rid of the sac for all the known reasons i.e.-reliability, feel, cost, etc.

thanks as usual,

Brian

sunny///M5 · 20th December 2007, 14:34

Last spring I changed the oem clutch to a SACHS (up to 900 Nm)

But attention - you will have to machine the (is this the correct word?) flywheel!

This clutch feels much stronger than (the old) oem one.

Lscman · 20th December 2007, 15:22

Quote:

Originally Posted by beegeezy

...I see UUC makes a non-sac style replacement clutch. Does anyone else make one thats longer lasting?

Absolutely not. The 11" UUC organic compound clutch assembly is a whopping 50% larger than stock. This does two things, it keeps temps down under severe duty and it greatly improves torque capability. For the last 50 year, trucks and performance street cars have used oversize organic clutches to provide good driveability with elevated severe duty capability.

Smaller clutches get much hotter under the same duty...so they must be designed to engage abruptly to reduce slip friction heat and/or use aggressive non-organic materials that withstand extreme temps better.

beegeezy · 20th December 2007, 21:20

No, I was talking about their direct fit clutch:
UUC-E39Z8-OEPO
I have heard mixed reviews about this clutch on here, so I was looking for a oem alternative.

I understand the benefits of a larger surface area clutch, but I know the drawbacks for this application as well. (Single mass flywheel, and everything that comes with that change)

I was just wondering if anyone had found a non-sac direct fit replacement clutch that retained the longevity of the original one. From my reading I have been led to believe that the Luk clutch would last much longer if not for the sac problems. Or look at it this way, the luk clutches that fail and start to slip usually have the sac to blame.

Brian

Quote:

Originally Posted by Lscman

Absolutely not. The 11" UUC organic compound clutch assembly is a whopping 50% larger than stock. This does two things, it keeps temps down under severe duty and it greatly improves torque capability. For the last 50 year, trucks and performance street cars have used oversize organic clutches to provide good driveability with elevated severe duty capability.

Smaller clutches get much hotter under the same duty...so they must be designed to engage abruptly to reduce slip friction heat and/or use aggressive non-organic materials that withstand extreme temps better.