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Stupid question time: on the turbocharger, the vacuum port on the charge side. Is it utilized? Why not use that as the vacuum source for the BOV? It's a closer

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Old 03-02-2016, 08:01 PM   #1 (permalink)
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Default BP turbo build/advice

Stupid question time: on the turbocharger, the vacuum port on the charge side. Is it utilized? Why not use that as the vacuum source for the BOV? It's a closer run than to the UIM.


EDIT: I meant to say BOV and not waste gate.

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Old 03-02-2016, 09:23 PM   #2 (permalink)
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Stupid question time: on the turbocharger, the vacuum port on the charge side. Is it utilized? Why not use that as the vacuum source for the wastegate? It's a closer run than to the UIM.


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I wondered about this sane question during my installation. I think it's just more accurate and closer to the engine block itself that's why the instructions say to tap the intake manifold.

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Old 03-02-2016, 11:53 PM   #3 (permalink)
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Stupid question time: on the turbocharger, the vacuum port on the charge side. Is it utilized? Why not use that as the vacuum source for the wastegate? It's a closer run than to the UIM.


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The reason for this is that you would have lower IM pressure. There is always a pressure drop across the system (piping and intercooler), and by taking the lines to the compressor cover, (for example) a 9psi spring may yield only 7psi at the manifold.

Since wastegates don't need vacuum and only operate by pressure, the absolute best source for the pressure is just before the TB...which is where the nipple is located on each one of these kits.
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