MoTeC M84 - Manual (Page 46)

44 Calibration MoTeC
To insert or delete sites use the Tools menu (press the F9 key). When sites
are inserted or deleted, the calibration tables may be adjusted so that the new
sites do not affect the tuning.
Dyno Calibration
The alternator should be connected while tuning the engine to ensure that the
injectors are working at normal operating voltage.
The exhaust system should be the same as that in the vehicle as it will affect
the engine tuning.
On multi runner intake manifolds the air box should be fitted as it is an integral
part of the intake system and will affect the engine tuning.
The fuel pressure is critical to the injector flow and should be monitored during
dyno tuning. Incorrect fuel pressure will result in incorrect tuning. Note that on
turbo engines the fuel pressure will vary as the manifold pressure varies
because the regulator maintains a fixed pressure above manifold pressure.
Fuel - Main Table
The Fuel - Main Table allows adjustment of the fuel at various RPM and Load
points.
Work through all the table values systematically so that all points are adjusted
for the correct Air Fuel Ratio reading.
Use extreme caution when adjusting the fuel to ensure that the engine does
not run lean at high loads. It is best to start rich. A temperature compensated
Wideband Air Fuel Ratio Meter is essential to ensure correct air fuel ratio.
Note: If the engine is misfiring for any reason (including over rich) the sensor
may falsely read lean due to the oxygen in the unburnt mixture.
The Air Fuel Ratio should be adjusted according to the engine load and the
desired results, for example, 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 changed 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