Fan Operation
The adjusted fan speed increases in a linear fashion as the cycle ratio increases. The rated speed (nNom ) in the M3 is the same as the maximum number of revolutions (2,400 RPM).
The engine speed of the M3 is controlled in a linear relationship with the cycle ratio(10-91%), starting with 800 RPM (1/3 of nNom ) up to 2,400 RPM.
NOTE:
In the E6x M5/M6 (600 W fan), an additional unregulated increase in engine speed to at least 2,700 RPM (nmax) is produced, from a 92% to 95% cycle ratio.