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injbatadj

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InjBatteryAdj

In the direct access area of ECMLink, there is a table called InjBatteryAdj. This table is indexed by battery voltage and provides an appropriate deadtime adjustment at the corresponding voltage. As voltage drops, injector response changes. Less voltage almost results in a “slower” injector and the need for more deadtime.

This page provides a simple explanation of how to “see” the effect of this table in your datalogs.

Before adjustment

The picture below shows a clip of a datalog where the power window switch was used to raise the windows until the windows were closed and then the switch was held a few seconds longer to produce a load on the alternator. As you can see, this dropped battery voltage and the mixture went lean as a result.

The following is the InjBatAdj table that was used. The injectors in this case were FIC 850s.

Voltage Deadtime
7 2115
9 1155
12 840
14 645
16 555
19 450

After adjustment

Based on the data from above, the 7, 9, and 12 volt entries were increased a bit. The result is shown in the image below.

The following is the table that was used.

Voltage Deadtime
7 2115
9 1530
12 990
14 645
16 555
19 495
injbatadj.1252576525.txt.gz · Last modified: 2009/09/10 05:55 by twdorris