Haltech E6GMX Manuel d'utilisateur télécharger pdf (Page 56)

E6GMX Manual

The final parameter on the Throttle Pump page is the Coolant Factor. Generally, when the

engine is cold, accelerator pump values need to be increased slightly. The E6GMX therefore

applies a coolant correction to the throttle pump in the same way as it does to the base map.

The Coolant Factor may be set with values from 0 to 4. Setting it to 0 will negate all coolant

correction to the throttle pump. The default setting for this parameter is 0.5.

6.2 Zero Throttle Map

One problem that often occurs with performance engines is rough idling. The manifold

design, cam characteristics, etc. can cause instability in the airflow. This makes fuel metering

difficult. In particular, the Map sensor often cannot correctly read the manifold pressure, as it

is non-existent, weak, or pulsing too much. In many cases though, once the engine has some

speed, the manifold pressure signal is useable.

The best method of mapping the engine is using the manifold pressure as the load. If in this

configuration idling is causing a problem, the Zero Throttle Map should be tried. This Map

maps the fuel delivery at zero throttle below 2000 rpm. There are a few requirements that

need to be met before you can use this Map. Firstly, your throttle position sensor must be

calibrated properly. Secondly, the Map relies on there being a consistent airflow at zero

throttle for a given engine speed. That means that devices such as idle speed motors that vary

the airflow at zero throttle will not allow the Zero Throttle Map to operate correctly.

6.3 Full Throttle Map

The manifold and throttle body design can also cause problems tuning at full throttle on

normally aspirated engines. In some cases, the manifold pressure can reach close to

atmospheric pressure before full throttle is reached. This means that bars close to the full load

bar on the Fuel Maps can interfere with the full load bar due to the interpolation between the

two bars.

If you are experiencing difficulties maintaining air : fuel ratio at full throttle, it may be

necessary to use the Full Throttle Map to set the full throttle mixtures. The Full Throttle Map

is activated above the value set in the Full Throttle Threshold in the Fuel Set-up, and has one

programmable bar every 500 rpm up to 16000 rpm.

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Haltech E6GMX Manuel d'utilisateur Page 56