MoTeC M880 - Manual (Page 51)

MoTeC Calibration 49
The Air Fuel Ratio should be adjusted according to the engine load and the
desired results, e.g. power, economy, emissions etc. At high loads the
mixture should be approximately 0.89 Lambda for maximum power. On turbo
charged engines a richer mixture may be required to reduce exhaust
temperatures and help avoid knocking. At lighter loads the mixture may be
adjusted for best emissions (1.00 Lambda) or best economy (1.05 Lambda).
The cranking (starting) fuel may be adjusted by adjusting the 0 RPM load
sites. Typically more fuel is required at cranking than at idle RPM.
The Quick Lambda feature may be used to quickly adjust each table value
with one key stroke (Press the Q key). The adjustment is made to the value
closest to the current engine operating point. The Quick Lambda feature may
only be used if the ECU is directly measuring the lambda reading. The
desired lambda value must be set in the Functions - Lambda Control Table.
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 View - Fuel Screens 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).
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.