Differences

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--- sdhose [2009/06/15 07:27]
twdorris
+++ sdhose [2024/03/15 11:16]
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-====== Speed Density - Vacuum Hose Considerations ======
-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.
-====== Worst Case ======
-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 pressure sensor.  That delay can wreak havoc on throttle response and can even cause the engine to have trouble starting or idling properly.
-====== Best Case ======
-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).
-{{  http://www.ecmtuning.com/images/forums/sddata/aemmdp.jpg?256x192  }}
-===== Middle Ground =====
-It's not always possible to run a pressure sensor directly off the manifold.  So a reasonable "middle" ground seems to be a single vacuum hose about 6-8 inches in length with no tees running straight from the manifold to the pressure sensor.

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