Clutch Slur

[shimmy]

I have a gut feel that the clutch slur issue us an easy fix bit it's just that nobody has worked out what it is yet!

Does the M3 SMG have the same problem?

[danp]

Originally Posted by SpineOnABap

Sadly it's not caused by driving style, otherwise we could prevent it. It's caused by shit design. It's the only thing I really HATE about CSL, and it's been bugging me since 2003 so it's a good job I really like the rest of the car

Is the design different from normal E46 M3 SMG? (apart from software)

They don't slur so much do they?

[SpineOnABap]

Don't know about the design, Dan. Something's different enough to cause this issue though.......


I had an E46 M3 SMG before the CSL and it didn't have this problem during the year I owned it.

[SpineOnABap]

Originally Posted by shimmy

I have a gut feel that the clutch slur issue us an easy fix bit it's just that nobody has worked out what it is yet!

You could well be right Shim! We (the CSL community) have been banging on about this issue since we first encountered it in 2003 - 7 years and still none the wiser. BMW clearly didn't care......

[The Gorilla]

Hi,

E46 M3 SMG 2 has a 'MAF' where the CSL does not.

The infamous CSL clutch slur is as a result
of the way the throttle inputs are received
by the ECU/DME and the commands it makes
based on the data received.

The 'Alpha N' type arrangement on the CSL
works on throttle/load there is no air
reading as such.

Regards,

The Gorilla.

[mattCSLnut]

Originally Posted by SpineOnABap

Sadly it's not caused by driving style, otherwise we could prevent it. It's caused by shit design. It's the only thing I really HATE about CSL, and it's been bugging me since 2003 so it's a good job I really like the rest of the car

I had something resembling what's been described as "Clutch Slur" happen to me @ Bedford TD yesterday. SMG in S5, SPORT on , 2nd into 3rd full throttle and a BIG flat spot, with a delay in execration. Very strange Keep in mind my clutch has been changed under warranty along with a new Duel mass flywheel only a year and 8000 miles ago.

[Bounce]

Originally Posted by SpineOnABap

Don't know about the design, Dan. Something's different enough to cause this issue though.......


I had an E46 M3 SMG before the CSL and it didn't have this problem during the year I owned it.

I had an SMG M3 for 4 years before the CSL,and never had one problem with slur.

[shane@mbtech]

Originally Posted by mattCSLnut

I had something resembling what's been described as "Clutch Slur" happen to me @ Bedford TD yesterday. SMG in S5, SPORT on , 2nd into 3rd full throttle and a BIG flat spot, with a delay in execration. Very strange Keep in mind my clutch has been changed under warranty along with a new Duel mass flywheel only a year and 8000 miles ago.

What does this mean

What level was your fuel at? ,I had similar issues always out of a chicane with between 1/4 and empty tank. I try not to run too low on fuel on track now, never had the issue since.

Did you have dsc completely off? or in M track?


Slur as described here is clutch slip so your revs rise then slur back down as clutch bites. Your symptoms sound slighhtly different

[danr55]

so does changing to S1 for a couple of days then changing back seem to fix it?

Any other specific fixes?

Don't fancy driving in S1 just to find out it doesn't improve anything!

[shimmy]

be careful on track as said as it can feel like cluch slur a bit as you can get fuel starvation on long corners then onto the straight (but never had it at Bedford - but coppice at Donny it alwasy happens about 1/6 tank)