Differences

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--- injbatadj [2009/09/10 05:49]
twdorris created
+++ injbatadj [2024/03/15 11:16] (current)
@@ Line 1: / Line 1: @@
 ====== 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.
+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.
 This page provides a simple explanation of how to "see" the effect of this table in your datalogs.
-{{  http://www.ecmtuning.com/images/forums/injbatadj-1.gif  }}
-{{  http://www.ecmtuning.com/images/forums/injbatadj-2.gif  }}
+===== 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.
+{{https://www.ecmtuning.com/images/forums/injbatadj-1.gif  }}
+The following is the InjBatAdj table that was used.  The injectors in this case were FIC 850s running at 43.5psi base fuel pressure.
+^    ^  Deadtime  ^
+^  Voltage  ^  (usecs)  ^
+|  7|  2490|
+|  9|  1530|
+|  12|  1215|
+|  14|  1020|
+|  16|  930|
+|  19|  825|
+**NOTE:** That list is total deadtime.  To use with ECMLink, set the deadtime offset field on the Fuel tab to zero.
+===== After adjustment =====
+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.
+{{https://www.ecmtuning.com/images/forums/injbatadj-2.gif  }}
+The following is the table that was used.
+^    ^  Deadtime  ^
+^  Voltage  ^  (usecs)  ^
+|  7|  2490|
+|  9|  1905|
+|  12|  1365|
+|  14|  1020|
+|  16|  930|
+|  19|  825|
+**NOTE:** That list is total deadtime.  To use with ECMLink, set the deadtime offset field on the Fuel tab to zero.

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