Wonder if something has gone bad with your clutch and or its actuation? Could explain the smell?
Google found this:
M3 has 58k miles.
Complaint: M3 started making loud grinding noise..stalled while driving...engine has no crank/no start. SMG light is lit up. FC 59 or 3B for actuation, clutch, dynamic.
Cause: Plastic ball pin at one end of clutch fork broke causing the piston to push further on the fork thus hitting the pressure plate. Spinning pressure plate grinded some metal off of the clutch fork making it thin enough for the piston to punch a hole through it. Clutch is now inop.
Correction: Removed transmission and replace ball pin, spring clip, clutch fork, and new clutch assembly.
I have done over 100 launch control functions and numerous HPDE events and the clutch still looks good. Not going to take any chances and just replace the pressure plate and disc.
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