Z3 Coupe (E36/8) Z3M Clutch Line Replacement

In doing some searching I came across several Z3M owners swapping out their stock clutch line for a non M clutch line in order to improve shifting.

Can someone confirm the correct p/n? I see both mentioned, however it's unclear if there's a difference between the two.

21 52 1 159 714
or
21 52 6 753 766

I just bought this one:
http://store.uucmotorwerks.com/stain...-s54-p318.aspx
Thread on it is here:
http://bimmerfest.com/forums/showthr...ht=clutch+hose

From what I've gathered, a SS line would be overkill. Plus, it would have to be mail ordered. I would much rather order an OEM part through my local parts guy?

Also the fitting on the SS lines is a restriction. Not as bad as the CDV, but not as good as the OEM non-M line.

Originally Posted by eurospec

From what I've gathered, a SS line would be overkill. Plus, it would have to be mail ordered. I would much rather order an OEM part through my local parts guy?

What is meant by overkill?
As to the difference between ordering from UUC or from the dealer, the dealer part will be more expensive.
The question is whether the OE part from the dealer has the restriction, the CDV (clutch delay valve), that interferes with good shifting. The UUC part does not have the CDV.

afaik The 2.8l has the least restriction and does not have the CDV. Whether this applies to other non M models, I'm unsure. Some more input would be appreciated.

I went with the SS line in my M coupe and am very pleased with the results. The main advantage of the SS line is the stiffness under pressure - it does not balloon under pressure as much as conventional rubber hydraulic line. This is supposed to improve the fidelity of the clutch response and feel. There are no restrictions the inlet & outlet, both are 3 mm which happens to match the hardline plumbing of the clutch system. There is talk about 'flow rate' but this is misleading, it's not a fuel line, the volume of fluid moving is small and the duration brief. In order to achieve a slight delay in clutch action the stock line has one orifice reduced in area by about 70%. So the bottom line is if you put in a high quality hydraulic line with an ID of around 3 mm your clutch will work a lot better than the stock set up.

There are many mfgrs. of the SS lines. I have read adverts claiming theirs only has the correct bend for ease of installation at the clutch end. I am considering one for my '01 3.0 but uncertain which to purchase. Any & all comments are appreciated!

I went with the UUC line. This post has pics of the installed line - http://www.bimmerfest.com/forums/sho...087&highlight= it fits just fine.

I have had a regular SS line installed since 2005 and never looked back. There were no clearance issues during install and when I had a look at it last year it looked almost new.

FWIW, my main reason for changing was due to shifting issues after sitting in traffic. It gets hot under there and i think that plus lots of stop-start shifting must soften the stock rubber line. I have also never noticed any of the noise issues some people report, but that might be to do with the Eisenmann race system

All this chatter about SS lines. Can anyone shed some light on an OE application?