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<h1>ECMLink - Speed Density Setup</h1> <div class="level1"> <p> This page describes the basic process for getting your car setup for speed density operation with ECMLink. If you need a more general speed density tutorial, then the <a href="/wiki/doku.php?id=sd101" class="wikilink1" title="sd101">Speed Density 101</a> page may be what you're looking for. In fact, we're going to assume you already know everything off that page as we discuss items below. So it might be a good idea to read over it even if you're already pretty familiar with SD in general. </p> </div> <h1>Connecting the Sensors</h1> <div class="level1"> <p> The first step is to connect your sensors to your ECU. You'll need a GM IAT sensor and an absolute pressure sensor. The following two sections list the supported sensors. A good source for the GM sensors might be <a href="http://www.gmpartsdirect.com/" class="urlextern" title="http://www.gmpartsdirect.com/" rel="nofollow">GM Parts Direct</a>. We also really like the <a href="http://www.eficonnection.com" class="urlextern" title="http://www.eficonnection.com" rel="nofollow">EFI Connection</a> for GM connectors. </p> <p> For addition wiring and/or pinout information, please refer to our <a href="/wiki/doku.php?id=ecuwiringinformation" class="wikilink1" title="ecuwiringinformation">ECU Wiring Information</a> page. </p> </div> <h2>Air temperature - GM IAT/AEM IAT</h2> <div class="level2"> <span class='np_break'> </span> <div class="table"><table class="inline"> <thead> <tr class="row0"> <th class="leftalign"> Sensor </th><th class="leftalign"> Desc/part number </th> </tr> </thead> <tr class="row1"> <td class="leftalign"> GM IAT </td><td class="leftalign"> GM Intake Air Temperature P/N 25036751, pig tail 12102620 </td> </tr> <tr class="row2"> <td class="leftalign"> AEM IAT </td><td class="leftalign"> The exact same as the GM IAT </td> </tr> </table> <span class='np_break'> </span> </div> <p> You must connect your IAT sensor to the ECU's IAT input. This is the only input that's compatible with the speed density logic inside the ECU. </p> <p> You'll want to use pin 72 (red w/blue stripe) on a 2G ECU harness or pin 8 (green w/orange stripe) on a 1G ECU harness for this. Or, more likely, you'll want to use those wires off the MAF harness under the hood since that's where the IAT sensor is actually being installed. <img src="/wiki/lib/images/smileys/icon_wink.gif" class="icon" alt=";-)" /> The wire colors are the same on the MAF connector as on the ECU harness. </p> <p> The IAT sensor has two wires coming out of it. Either wire can be connected to the ECU's IAT input. </p> <p> The other wire should be connected to the ECU's sensor ground. That would be pin 92 (black) on a 2G ECU harness or pin 24 (green w/black stripe) on a 1G ECU harness. This can also be pulled from the MAF connector under the hood. The wire colors are the same on the MAF connector as on the ECU harness. </p> </div> <h2>Absolute Pressure</h2> <div class="level2"> <span class='np_break'> </span> <div class="table"><table class="inline"> <thead> <tr class="row0"> <th class="leftalign"> Sensor </th><th class="leftalign"> Desc/part number </th> </tr> </thead> <tr class="row1"> <td class="col0"> GM 3-bar </td><td class="leftalign"> GM 3-bar P/N 12223861, pig tail 15305891 </td> </tr> <tr class="row2"> <td class="leftalign"> GM 3.3-bar </td><td class="leftalign"> GM 3.3-bar P/N 9373269, pig tail 88987997 </td> </tr> <tr class="row3"> <td class="leftalign"> AEM 3.5-bar </td><td class="leftalign"> AEM 30-2130-50 (50 PSIA / 3.5 Bar) </td> </tr> <tr class="row4"> <td class="leftalign"> AEM 5-bar </td><td class="leftalign"> AEM 30-2130-75 (75 PSIA / 5 Bar) </td> </tr> </table> <span class='np_break'> </span> </div> </div> <h1>Configuring the Software</h1> <div class="level1"> <p> First, make sure you have installed the latest version of our application off our <a href="http://www.ecmtuning.com/downloads.php" class="urlextern" title="http://www.ecmtuning.com/downloads.php" rel="nofollow">downloads page</a>. You'll want at least v3.18.182. Anything older than that may not even connect with your ECU. </p> <p> Once you have installed the latest software, you can enable speed density operation by defining three things: <br/> </p> <p> Engine Displacement, MAP Sensor Location and Type, and BaseMAF type </p> </div> <h2>Engine Displacement</h2> <div class="level2"> <p> <a href="/wiki/lib/exe/fetch.php?tok=d74765&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsddisplacement.png" class="media" title="http://www.ecmtuning.com/images/forums/sddata/sddisplacement.png"><img src="/wiki/lib/exe/fetch.php?tok=d74765&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsddisplacement.png" class="medialeft" alt="" /></a> This one is trivial. On the Speed Density tab, there's a text box where you need to enter your engine displacement. The ECU uses this information to correctly calculate airflow. More information on this process is outlined in the <a href="/wiki/doku.php?id=sd101" class="wikilink1" title="sd101">SD101 page</a>. </p> </div> <h2>MAP Sensor Location and Type</h2> <div class="level2"> <p> <a href="/wiki/lib/exe/fetch.php?tok=c72986&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsdmaploc.png" class="media" title="http://www.ecmtuning.com/images/forums/sddata/sdmaploc.png"><img src="/wiki/lib/exe/fetch.php?tok=c72986&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsdmaploc.png" class="medialeft" alt="" /></a> Because you can connect your MAP sensor to any number of ECU inputs, you have to tell the ECU where it can find this sensor in order to use it for SD operation. You do this on the ECU Inputs tab in the "Pin Assignments for ECMLink Functions (ECU-side)" area. </p> </div> <h2>BaseMAF Type</h2> <div class="level2"> <p> <a href="/wiki/lib/exe/fetch.php?tok=bf118a&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsdbasemaf.png" class="media" title="http://www.ecmtuning.com/images/forums/sddata/sdbasemaf.png"><img src="/wiki/lib/exe/fetch.php?tok=bf118a&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Fsdbasemaf.png" class="medialeft" alt="" /></a> The final step is to tell the ECU to ignore incoming MAF data and calculate it from speed density data instead. You do that on the MAFComp tab by selecting "Speed Density" as your Base MAF type. </p> </div> <h1>Dialing in the VE Table</h1> <div class="level1"> </div>