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Old 11-29-2013, 09:08 PM   #1
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Default N00B - What are these hoses?



I am removing my intake air tube to put on a IAT bung.

I thought there was only an MAF sensor harness on the tube but there were two other hoses and I am not 100% what they are.

One runs from Green to Green and the other from Orange to Orange

- I suspect Orange Orange. Intake Tube to beneath intake manifold. I suspect it has to do with idle air control and connects to what appears to be a solenoid under the intake manifold. I have no idea how this mechanism works - what is it called so I can google?

- the second goes from Green to Green. Intake Tube to side of head (where I see some people have tiny little breathers sometimes), what is this?

As i go Turbo, where do I connect the idle hose? where to I connect the head hose?
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Old 11-29-2013, 09:20 PM   #2
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Green to green is the crankcase vacuum. You can either vent it to atmosphere or hook it to your turbo inlet with a catch-can inline.

There is no hose traveling from orange to orange. The idle tube sits just to the right of your green circle.
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Old 11-29-2013, 09:33 PM   #3
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PCV hook up somewhere in your intake/charge system. If you connect post turbo be sure to have the check valve as to not further pressurize the crankcase. I usually hook PCV from Valve cover to a catch can, back into the intake pre turbo. Look in the engine bay thread to get a better idea of where people traditionally route them as I only have turbo experience on Nissan, Subaru, and fwd bp.

IACV Needs to be hooked up as to allow a small amount of metered air to bypass into the intake manifold when the throttle butterfly is closed.
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Old 11-29-2013, 09:35 PM   #4
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Thanks Sav, sorry I should have explained: that is not my engine bay.

Orange went from the intake air tube (approx 1/2" OD) to beneath the inlet of the air intake manifold.

Pictures here:




The removed intake tube has a little bung where I had orange

The intake manifold has the inlet under the sock
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Old 11-29-2013, 09:36 PM   #5
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Aha!

Quote:
Originally Posted by xxtokesxx View Post
PCV hook up somewhere in your intake/charge system. If you connect post turbo be sure to have the check valve as to not further pressurize the crankcase. I usually hook PCV from Valve cover to a catch can, back into the intake pre turbo. Look in the engine bay thread to get a better idea of where people traditionally route them as I only have turbo experience on Nissan, Subaru, and fwd bp.

IACV Needs to be hooked up as to allow a small amount of metered air to bypass into the intake manifold when the throttle butterfly is closed.
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Old 11-29-2013, 10:29 PM   #6
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Thanks Sav, I see what you are saying - slight mis-communication on my part.

Quote:
Originally Posted by Savington View Post
Green to green is the crankcase vacuum. You can either vent it to atmosphere or hook it to your turbo inlet with a catch-can inline.

There is no hose traveling from orange to orange. The idle tube sits just to the right of your green circle.
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