MoTeC M8 - Manual (Page 44)

42 Calibration
Dyno
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 effect
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 effect the engine tuning.
The fuel pressure is critical to the injector flow and should be monitored
during dynoing. 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
wide band Air Fuel Ratio Meter is essential to ensure correct air fuel ratio.
If the engine is missing 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, 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