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injbatadj [2009/09/10 08:34] twdorris |
injbatadj [2024/03/15 11:16] |
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- | ====== InjBatteryAdj ====== | ||
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- | 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 results in a "slower" injector and the need for more deadtime. | ||
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- | This page provides a simple explanation of how to "see" the effect of this table in your datalogs. | ||
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- | ===== Before adjustment ===== | ||
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- | 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. | ||
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- | {{http://www.ecmtuning.com/images/forums/injbatadj-1.gif }} | ||
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- | The following is the InjBatAdj table that was used. The injectors in this case were FIC 850s running at 43.5psi base fuel pressure. | ||
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- | ^ ^ Deadtime ^ | ||
- | ^ Voltage ^ (usecs) ^ | ||
- | | 7| 2490| | ||
- | | 9| 1530| | ||
- | | 12| 1215| | ||
- | | 14| 1020| | ||
- | | 16| 930| | ||
- | | 19| 825| | ||
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- | ===== After adjustment ===== | ||
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- | Based on the data from above, the 12-volt entry was increased by 150usecs. The 9-volt entry was also increased just to provide a "smoother" transition to the 7-volt entry. The result is shown in the image below. | ||
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- | {{http://www.ecmtuning.com/images/forums/injbatadj-2.gif }} | ||
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- | The following is the table that was used. | ||
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- | ^ Voltage ^ Deadtime ^ | ||
- | | 7| 2490| | ||
- | | 9| 1905| | ||
- | | 12| 1365| | ||
- | | 14| 1020| | ||
- | | 16| 930| | ||
- | | 19| 825| | ||
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