MoTeC M880 - Manual (Page 52)

50 Calibration
The Ignition Timing should be adjusted for maximum torque without knocking,
by increasing the advance until the torque stops increasing. Make sure there
is at least 3 or 4 degrees margin to the knock limit.
Too much retard will cause excessive exhaust gas temperature.
At idle a more retarded ignition setting is desirable (approximately 10 to 15
degrees). This makes the idle speed less sensitive to load changes. Also the
ignition should be flat over the idle RPM range so that timing variations do not
cause the engine to hunt, since variations in the timing will vary the engine
torque.
The Quick Lambda feature may also be used from the Ignition Main Table,
which allows ignition timing adjustments to be made while also maintaining
correct mixture readings.
Use the View - Ignition Screen to check that all the fuel trims and
compensations are correct (Press the V key).
Refer to the ECU Manager software help for more details (Press F1).
Fuel - Injection Timing
The Fuel - Injection Timing table allows adjustment of the Fuel End of
Injection Timing at various RPM points and optionally at various Load points.
This table is only effective if the injectors are fired sequentially.
Adjusting the Injection Timing ensures that the fuel is injected at the optimum
point in the engine cycle, so that the engine makes best use of the fuel. In
theory the fuel should end injection at a point where all the fuel will be sucked
into the current induction stroke, therefore the end of injection point should be
some time before the intake valve closes. The optimum point depends on the
engine RPM and load.
Torque, economy, emissions and idle quality are all effected by the Injection
Timing.
At high duty cycles the Injection Timing will have minimal influence since the
injectors are on for most of the engine cycle.
Refer to the ECU Manager software help for more details (Press F1).