ECMTuning - wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.

<h1>InjBatteryAdj</h1> <div class="level1"> <p> 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. </p> <p> This page provides a simple explanation of how to "see" the effect of this table in your datalogs. </p> </div> <h2>Before adjustment</h2> <div class="level2"> <p> 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. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=32f561&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Finjbatadj-1.gif" class="media" title="http://www.ecmtuning.com/images/forums/injbatadj-1.gif"><img src="/wiki/lib/exe/fetch.php?tok=32f561&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Finjbatadj-1.gif" class="medialeft" alt="" /></a> </p> <p> The following is the InjBatAdj table that was used. The injectors in this case were FIC 850s running at 43.5psi base fuel pressure. </p> <span class='np_break'> </span> <div class="table"><table class="inline"> <thead> <tr class="row0"> <th class="leftalign"> </th><th class="centeralign"> Deadtime </th> </tr> <tr class="row1"> <th class="centeralign"> Voltage </th><th class="centeralign"> (usecs) </th> </tr> </thead> <tr class="row2"> <td class="rightalign"> 7</td><td class="rightalign"> 2490</td> </tr> <tr class="row3"> <td class="rightalign"> 9</td><td class="rightalign"> 1530</td> </tr> <tr class="row4"> <td class="rightalign"> 12</td><td class="rightalign"> 1215</td> </tr> <tr class="row5"> <td class="rightalign"> 14</td><td class="rightalign"> 1020</td> </tr> <tr class="row6"> <td class="rightalign"> 16</td><td class="rightalign"> 930</td> </tr> <tr class="row7"> <td class="rightalign"> 19</td><td class="rightalign"> 825</td> </tr> </table> <span class='np_break'> </span> </div> <p> <b>NOTE:</b> That list is total deadtime. It assumes use of "0" in the ECMLink deadtime offset field on the fuel tab. </p> </div> <h2>After adjustment</h2> <div class="level2"> <p> 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. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=821a00&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Finjbatadj-2.gif" class="media" title="http://www.ecmtuning.com/images/forums/injbatadj-2.gif"><img src="/wiki/lib/exe/fetch.php?tok=821a00&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Finjbatadj-2.gif" class="medialeft" alt="" /></a> </p> <p> The following is the table that was used. </p> <span class='np_break'> </span> <div class="table"><table class="inline"> <thead> <tr class="row0"> <th class="leftalign"> </th><th class="centeralign"> Deadtime </th> </tr> <tr class="row1"> <th class="centeralign"> Voltage </th><th class="centeralign"> (usecs) </th> </tr> </thead> <tr class="row2"> <td class="rightalign"> 7</td><td class="rightalign"> 2490</td> </tr> <tr class="row3"> <td class="rightalign"> 9</td><td class="rightalign"> 1905</td> </tr> <tr class="row4"> <td class="rightalign"> 12</td><td class="rightalign"> 1365</td> </tr> <tr class="row5"> <td class="rightalign"> 14</td><td class="rightalign"> 1020</td> </tr> <tr class="row6"> <td class="rightalign"> 16</td><td class="rightalign"> 930</td> </tr> <tr class="row7"> <td class="rightalign"> 19</td><td class="rightalign"> 825</td> </tr> </table> <span class='np_break'> </span> </div> </div>