MoTeC M8 - Manual (Page 45)

MoTeC Calibration 43
desired lambda value must be set in the Misc Functions - Lambda Control
Table. (Requires Advanced Tuning).
If the maximum value in the table falls bellow 60 then the setup parameter
IJPU should be decreased to increase the table values. This ensures that the
table has sufficiently fine resolution. Similarly if the table values reach the
maximum of 99.5 the IJPU setup parameter should be increased to decrease
the table values.
Use the F5 key to change quickly between the Fuel - Main Table and the
Ignition - Main Table.
Use the F6 key to change quickly between the Fuel - Main Table and Fuel -
Timing Table.
Use the Trims Screen to check that all the fuel trims and compensations are
correct (Press the T key).
Refer to the E.M.P. Software help for more details (Press F1).
Ignition - Main Table
The Ignition - Main Table allows adjustment of the Ignition Timing at various
RPM and Load points.
Start with a conservative curve for the particular engine, not too advanced
and not too retarded.
Use extreme caution when adjusting the Ignition Timing to ensure that the
engine does not knock due to excessive advance. Re-check the Ignition
Timing with a Timing Light to ensure that the what the ECU thinks is the
ignition advance is in fact the actual advance.
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.