ECMTuning - wiki

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<h1>Speed Density Options and Configurations</h1> <div class="level1"> <p> One question we keep getting goes something like "how much is SD" or "what do I need to run SD". </p> <p> First, pricing information is listed on our website. So that one's easy. </p> <p> But to figure out what to order, you have to consider a number of different configuration options. This page attempts to list these out in a "walk-through" layout. </p> </div> <h2>IAT Sensor or Not</h2> <div class="level2"> <p> The simplest choice to make is whether you want to run an IAT sensor or not. Many people run without an IAT sensor at all simply because they either don't want to install one or they actually want the mixture to run a little richer as air temps increase or they want to use the IAT input to log something else. </p> <p> Obviously you lose the compensation you would normally get at full throttle with an IAT, but that usually just results in a richer mixture as air temps increase anyway. So it's not always a bad thing. You just have to remember that this compensation isn't taking place and expect to see lower (richer) A/F ratios at the end of a hard road course session than you were seeing at the start, for example. </p> <p> Click on the following links to continue. </p> <p> <a href="/wiki/doku.php?id=sdoptions_noiat" class="wikilink1" title="sdoptions_noiat">RUN SD WITH NO IAT SENSOR</a> </p> <p> <a href="/wiki/doku.php?id=sdoptions_iat" class="wikilink1" title="sdoptions_iat">WITH SD WITH IAT SENSOR</a> </p> </div> <h3>GM-style MAP with no IAT</h3> <div class="level3"> <p> If you're running a GM-style MAP with no IAT sensor, you'll still need to decide how you want to wire the MAP sensor into your harness. You can use our <a href="http://www.ecmtuning.com/product_info.php?cPath=26&products_id=52" class="urlextern" title="http://www.ecmtuning.com/product_info.php?cPath=26&products_id=52" rel="nofollow">SD Cable</a> if you want a plug-n-play solution. You'll just leave the IAT connector unused. </p> <p> Or you can wire the MAP sensor into the wiring harness using our pig tail. The red wire goes to +5v, the black wire goes to sensor ground and the blue wire goes to whichever <a href="/wiki/doku.php?id=externalsensorinput" class="wikilink1" title="externalsensorinput">ECU input</a> you've chosen for the MAP. The most common is the baro input, but that depends on a few other decisions like whether you're going to retain the stock MAF while dialing in the SD VE table. Pin out information can be found on our <a href="/wiki/doku.php?id=ecuwiringinformation" class="wikilink1" title="ecuwiringinformation">ECU wiring information</a> page. </p> </div> <h3>Mitsubishi-style MAP with no IAT</h3> <div class="level3"> <p> The Mitsubishi-style MAP plugs directly into your 2G MDP harness connector. The MAP sensor bolts onto the intake manifold in place of the <a href="http://www.ecmtuning.com/images/forums/gm3barinstall/map_unplugged.jpg" class="urlextern" title="http://www.ecmtuning.com/images/forums/gm3barinstall/map_unplugged.jpg" rel="nofollow">factory MDP sensor</a>. So make sure you're either running a factory 2G DSM intake manifold or that your manifold has been adapted with this flange. </p> </div> <h2>Other considerations not covered</h2> <div class="level2"> <p> There are so many different ways to setup SD that it's a little crazy sometimes. </p> <p> For example, you could already have a MAP sensor and just want to install the IAT sensor. In this case, you might want to hard wire it or use the SD Cable anyway. </p> <p> Or you might already have a GM MAF cable and just want to use the <a href="/wiki/doku.php?id=gmmafiatbaro" class="wikilink1" title="gmmafiatbaro">break out points</a> already provided with that. And, again, this could be with or without an IAT sensor too. </p> <p> Or you might want to retain your factory MAF sensor temporarily while dialing in the SD VE table with the MAP (either temporarily or permanently) connected to an input other than the baro so that you can retain MAF operation. </p> <p> So it's crazy to try to document and support every single possible combination that comes up. At some point, you have to step back, learn and take in all the options and put together your specific plan of attack. </p> </div>