clutch slurrrr

[Thorney]

Shimmy is in part right, there is certainly an issue in the interface between the clutch and the software, the problem is that the software is unable to adjust fast enough to allow for mechanical wear that the clutch naturally suffers, this wear also manifests itself in dirt build up etc, basically anything that causes the mechanical interface to differ (wear or lots of time in traffic - essentially the same thing to some extent).

The solution is regular re-calibration, think of it like rebooting your PC, every now and then you do that to clear out memory, IE cache etc etc, the PC doesn't 'need' it per se but it works better after its done. Sadly this re-calibration can only be done with a handful of diagnostic tools, we sue the Autologic (which is by far the most expensive but also the most sophisticated, with upgrades its nearly £15k) or even an older GT1 but these are rapidly getting out of date. BMW continually update the software (I'm not sure if they're trying to fix it or whatever) so you do need things updating.

Only advice I can give is do as we do and make sure every time your CSL goes into a dealer or indy for service is to ensure that the SMG calibration (full not just the bight points) is re-done each time, we include as part of any CSL we see even those in for a quick look over etc, it only takes 20 mins or so, less than that really. The alternative is to rag the crap out of the car regularly, this has the effect of keeping the clutch/flyhweel clean but it wont re-calibrate the software, theres no alternative really.