Quote:
Originally Posted by CanAutM3
The damping needs to be matched to the spring rates for optimal ride/handling results. As has been discussed in this thread, it seems that BMW elected to use the non-CP spring rates on the M3cs, which means a more stiffly sprung M3CP would be under-damped when coded with the M3cs EDC. It would be interesting to try the M4cs EDC coding on an CP M3 (if it is even possible), since the M4cs is specced with the CP spring rates. But even then, the front swaybar would need to be changed to a softer non-CP one for more optimal results.
Note that stiffer does not necessarily imply better performance. In general terms softer suspension tuning translates to increased overall grip while stiffer translates to a sharper handling response.
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From what I discussed with Alex, the CS coding is generic for both M3 and M4.
The shocks are valved the same (same dyno curves) and for a certain spring rate range (which the ZCP/Base springs fall into).
It's possible that there is a scaling factor applied based on the measurements
taken from the shock acceleration sensor (sensing the up and down motions
of the wheel when hitting bumps) and telling the electronic adjuster at the top of the shock to stiffen/soften the shock.
So if the M4 runs stiffer springs vs the M3, then it may not matter in the end, since the sensor really is the one determining the appropriate shock adjustment based on wheel motion (up/down).