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<h1>Speed Density - Vacuum Hose Considerations</h1> <div class="level1"> <p> In testing various speed density installations, we've noticed that the vacuum hose configuration leading from the manifold to the pressure sensor can be an important consideration in getting throttle response right. </p> </div> <h1>Best Case</h1> <div class="level1"> <p> The "best case" scenario is to locate the pressure sensor directly on the manifold. An example is shown below on a 2G using an MDP adapter from Road Race Engineering and an AEM 5-bar sensor (click image to enlarge). </p> <p> <a href="/wiki/lib/exe/fetch.php?tok=d56752&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Faemmdp.jpg" class="media" title="http://www.ecmtuning.com/images/forums/sddata/aemmdp.jpg"><img src="/wiki/lib/exe/fetch.php?w=256&h=192&tok=8bf046&media=http%3A%2F%2Fwww.ecmtuning.com%2Fimages%2Fforums%2Fsddata%2Faemmdp.jpg" class="mediacenter" title="www.ecmtuning.com_images_forums_sddata_aemmdp.jpg" alt="www.ecmtuning.com_images_forums_sddata_aemmdp.jpg" width="256" height="192" /></a> </p> </div> <h1>Worst Case</h1> <div class="level1"> <p> The worst case scenario is to have a vacuum hose coming off the manifold into a small tee and then off through a long length of additional vacuum hose leading to the pressure sensor. The tee can act as a restriction leading to additional delay in equalizing the pressure between the manifold and the vacuum hose leading to the pressure sensor. That delay can wreak havoc on throttle response and can even cause the engine have trouble starting or idling properly. </p> </div>