MoTeC M8 - Manual (Page 27)

MoTeC Installation 25
Current
Different injectors require different operating currents. The ECU injector
drives must be programmed to suit the injector using the Injector Current
setup parameter.
Pulse Width
The amount of time that the injector spends open during each injection pulse
is called the Injector Pulse Width and is measured in milliseconds
(thousandths of a second), abbreviated as msec.
The injector pulse width is controlled by the ECU according to the ECUs
calibration data.
Duty Cycle
The Injector Duty Cycle is a measure of the ratio of the time the injector is
open (pulse width) to the available time per engine rev or engine cycle. For
example if the injectors where on for half the available time then the duty
cycle would be 50%.
The maximum allowable duty cycle is about 85 percent, beyond this the
injector does not have time to open and close and is therefore open
continuously and cannot deliver more fuel.
The ECU will set a Diagnostics Error if the duty cycle exceeds the maximum
allowed duty cycle.
Ignition System
Ignition System Types
Many different types of ignition systems are available and some suit different
jobs better than others.
CDI Distributed
CDI systems are suited to high revving engines with 8 or more cylinders and
are generally capable of at least 12,000 RPM on an 8 cylinder. CDIs are also
good at firing fouled plugs.