MoTeC Knock OKM - Manual (Page 23)

MoTeC Operation 23
Operation
Once the Knock Control System is tuned, it can be used for continuous
monitoring.
The configuration will generally not need any adjustment. Only major changes
in engine (exhaust, cams, pistons etc) and transmission might require a new
centre frequency setting.
In this case, the vehicle should be returned to the dealer for a new frequency
analysis.