Coil Dwell Time; Coil Dwell Correction - ECU Master EMU User Manual

Spark cut percent
Ignition retard

Coil dwell time

Coil dwell table defines how long the ignition coil will be energized as a function of battery voltage.
The lower the battery voltage, the longer time is required to energize the coil. Dwell times that are
too short will lead to weak spark and misfires. Dwell times that are too long will lead to overheating
the coils.
To create the Coil dwell table you are advised to use the Coils dwell wizard or use the coil
manufacturer datasheet.

Coil dwell correction

Coil dwell correction table is used to correct coil dwell time as a function of RPM. It is common to
increase dwell time at low RPM to improve combustion efficiency. Due to the low RPM, coil thermal
stress doesn't increase substantially.
Ignition vs CLT correction
Igntion vs CLT table defines ignition angle correction as a function of engine coolant temperature.
When active idle control via ignition timing is used, it references the Idle ign. vs CLT table.
Maximum percentage of cut spark at rev limit RPM. If this value is too
small the soft rev limiter will not be able to limit the RPM
The ignition angle retard in the Control range area. This parameter can
be used to soften the rev limiter and protect the engine against knock
during RPM limit
Interpolation of spark cut value in the control range region
Page 80