ECMTuning - wiki

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<h1>ECU-based Boost Control Overview</h1> <div class="level1"> <p> ECMLink's boost control mechanism is modeled after the factory implementation provided on 1995+ DSMs and Lancer EVOs. The most notable difference being that ECMLink's implementation provides gear-based control rather than a single curve that applies all the time. </p> <p> The basic operation goes like this: </p> <ol> <li class="level1"> Look up a base duty cycle from the Base Duty Cycle table based on gear and engine speed (RPM)</li> <li class="level1"> Adjust this value by some amount based on how far away current boost is from desired boost</li> </ol> <p> This sounds pretty simple and it really is, but once you start picking about the phrases, you'll see it's a bit more involved than it might seem at first. </p> <p> A sample screen shot is provided below for reference in the following sections. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=9662f6&media=http%3A%2F%2Fwww.ecmtuning.com%2Fwiki%2F_media%2Fsamplebcs.png" class="media" title="http://www.ecmtuning.com/wiki/_media/samplebcs.png"><img src="/wiki/lib/exe/fetch.php?tok=9662f6&media=http%3A%2F%2Fwww.ecmtuning.com%2Fwiki%2F_media%2Fsamplebcs.png" class="mediacenter" alt="" /></a> </p> </div> <h2>Base Duty Cycle</h2> <div class="level2"> <p> The Base Duty Cycle table defines the starting point for the boost control solenoid. At any given RPM and in any particular gear, the ECU references this table to get a "base" value it'll use for the boost solenoid output. </p> <p> If error correction has been disabled, then this value is the final value the ECU is going to use and your turbo will build whatever boost it just happens to build for the given wastegate duty cycle. You can use this mode of operation during setup and dialin to find where you setup naturally needs to be to build the boost you're looking for. </p> <p> If error correction has been enabled, then the ECU references the Boost Target table to determine (for the same RPM and gear) what boost it should be trying to achieve at that moment. </p> </div> <h2>Boost Target</h2> <div class="level2"> <p> The Boost Target table defines the manifold pressure the user is expecting to achieve at a given RPM/gear combination. The ECU uses this value when error correction is enabled to adjust the base duty cycle value up or down as necessary in an attempt to get measured boost to match the target value. </p> <p> Measured boost is determined from the configured MAP sensor input on the ECU Inputs tab. You MUST configure this input first before the error correction process will work. You do this on the ECU Inputs tab using the fields shown below. </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=673183&media=http%3A%2F%2Fwww.ecmtuning.com%2Fwiki%2F_media%2Fmappinassignments.png" class="media" title="http://www.ecmtuning.com/wiki/_media/mappinassignments.png"><img src="/wiki/lib/exe/fetch.php?tok=673183&media=http%3A%2F%2Fwww.ecmtuning.com%2Fwiki%2F_media%2Fmappinassignments.png" class="mediacenter" alt="" /></a> </p> </div>