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VFAD solenoid help

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Old Jul 6, 2018 | 10:20 AM
  #1  
JoyBed's Avatar
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VFAD solenoid help

Hi! I have the high power rx8 and on the vfad solenoid there i had the hose disconnected, so i plugged it back but what should i do with the other plug? Does it needs to be plugged to be air tight or just as is wented?


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Old Jul 14, 2018 | 05:05 PM
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Assuming S2 and S1 VFAD are the same, mine is plugged by a plastic piece, so you should plug it as well.
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Old Jul 15, 2018 | 04:26 AM
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Originally Posted by UnknownJinX
Assuming S2 and S1 VFAD are the same, mine is plugged by a plastic piece, so you should plug it as well.
Thanks to your reply, so I will plug it as soon as i get to the car.

Last edited by JoyBed; Jul 15, 2018 at 04:54 AM.
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Old Jul 15, 2018 | 06:54 AM
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Don't plug it.


The "plug" that people see is actually called a "silencer" by Mazda. It doesn't actually seal. It's there to allow the VFAD vacuum actuator system to return to atmospheric pressure.


Below 5500 RPM, the solenoid is de-energized and the VFAD actuator is kept at intake pressure (vacuum). Above 5500 RPM, the solenoid is energized and it allows the VFAD actuator to return to atmospheric pressure.



If you cap that port, the VFAD will never return to atmospheric pressure and it will never open.


VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE CONSTRUCTION/OPERATION (13B-MSP (HIGH POWER))
VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE INSPECTION (13B-MSP (HIGH POWER))
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR INSPECTION (13B-MSP (HIGH POWER))
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Old Jul 15, 2018 | 12:16 PM
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Originally Posted by NotAPreppie
Don't plug it.


The "plug" that people see is actually called a "silencer" by Mazda. It doesn't actually seal. It's there to allow the VFAD vacuum actuator system to return to atmospheric pressure.


Below 5500 RPM, the solenoid is de-energized and the VFAD actuator is kept at intake pressure (vacuum). Above 5500 RPM, the solenoid is energized and it allows the VFAD actuator to return to atmospheric pressure.



If you cap that port, the VFAD will never return to atmospheric pressure and it will never open.


VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE CONSTRUCTION/OPERATION (13B-MSP (HIGH POWER))
VARIABLE FRESH AIR DUCT (VFAD) SOLENOID VALVE INSPECTION (13B-MSP (HIGH POWER))
VARIABLE FRESH AIR DUCT (VFAD) ACTUATOR INSPECTION (13B-MSP (HIGH POWER))
Oops, sorry.

So is that silencer essential, or it's just for noise reduction?
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Old Jul 15, 2018 | 01:43 PM
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Originally Posted by UnknownJinX
Oops, sorry.

So is that silencer essential, or it's just for noise reduction?

It's definitely not essential. No idea about the other part.
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Old Jul 15, 2018 | 02:38 PM
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So can I leave as it ia now uncapped and the VFAD will work? 😂
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Old Jul 15, 2018 | 04:58 PM
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Yes. I'd put something over the nipple to filter out the dust and other schmoo to make sure it doesn't gum up the solenoid.

Last edited by NotAPreppie; Jul 15, 2018 at 05:02 PM.
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Old Jul 15, 2018 | 09:30 PM
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Originally Posted by NotAPreppie
Yes. I'd put something over the nipple to filter out the dust and other schmoo to make sure it doesn't gum up the solenoid.
like these supercheap ebay mini cap filters? they are 2$ or so maybe the mazda’s silencer have a little filter in it too
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Old Jul 16, 2018 | 01:45 AM
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Here is what the stock cap looks like.

Just ask a local dealer and see how much this costs.
Attached Thumbnails VFAD solenoid help-img_20180715_233943-960x1280.jpg   VFAD solenoid help-img_20180715_233924-960x1280.jpg   VFAD solenoid help-img_20180715_233934-960x1280.jpg  
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Old Jul 16, 2018 | 02:11 AM
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Originally Posted by UnknownJinX
Here is what the stock cap looks like.

Just ask a local dealer and see how much this costs.
The stealership around here is costly as .... so if it is just something that vents that nipple of the actuator to the atmosphere iwill just add some cheap ebay fiter and it will be looking awesome :D
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Old Apr 1, 2022 | 02:54 PM
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Vfad Solenoid replacement

I recently installed a short ram intake on my car and made the mistake of throwing away the sensor and the vacuum chamber. Could someone tell me where I could find a new one because I haven’t been able to find a new one. It’s throwing a CEL and I need a fix whether it’s finding the part or removing the whole vfad system
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