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sdhose [2010/04/30 23:42]
snowborder714
sdhose [2010/05/21 13:37]
twdorris
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 ====== Speed Density - Vacuum Hose Considerations ====== ====== 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. 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.
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 ====== Worst Case ====== ====== 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. 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.
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 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). 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).
  
 +===== 2G DSM Example =====
 {{  http://​www.ecmtuning.com/​images/​forums/​sddata/​aemmdp.jpg?​256x192 ​ }} {{  http://​www.ecmtuning.com/​images/​forums/​sddata/​aemmdp.jpg?​256x192 ​ }}
  
 +===== 1G DSM Example =====
 For a 1g intake manifold, you can drill and tap (1/8" NPT) the boss next to the brake booster nipple and thread the sensor in with teflon tape on the threads. ​ An example is shown below with an AEM 5-bar sensor (click image to enlarge). For a 1g intake manifold, you can drill and tap (1/8" NPT) the boss next to the brake booster nipple and thread the sensor in with teflon tape on the threads. ​ An example is shown below with an AEM 5-bar sensor (click image to enlarge).
  
sdhose.txt ยท Last modified: 2024/03/15 11:16 (external edit)