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Intercooler piping help!: Cross over tube?

 
Old 04-26-2019, 12:24 AM
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Default Intercooler piping help!: Cross over tube?

I picked up a turbo miata in "project mode" - and almost got it back together except for the this mystery in the picture. Do you simply get a piece of hose to cross over the two sides of the intercooler tubing?
Looking for some insight into what to do here. (see pics) :


left intercooler tubing from throttle body

tubing from turbo to filter
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Old 04-26-2019, 07:05 AM
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Top photo barb goes to your MBC/EBC, then to your wastegate actuator's barb - it's your boost pressure source.

Second photo barb is for for venting the crank-case air cleanly.
ie. Hotside crank case barb -> Oil Catch Can -> AIr Intake Barb
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Old 04-26-2019, 09:18 AM
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The barb in the first photo is way too big for a vacuum line.

To me looks like it's for a recirculating BOV which dumps into the barb in front of the filter.

Do I see an MAF in your second pic?

What engine/fuel management you running?
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Old 04-26-2019, 12:28 PM
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Default Mspnp 2

Thanks for the response, I figured it was a recirc tube as well.

I just bought a MSPNP 2 to replace Link. I also have the speed density setup ready to install. Any suggestions with that setup?
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Old 04-26-2019, 07:39 PM
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Originally Posted by borka View Post
The barb in the first photo is way too big for a vacuum line.

To me looks like it's for a recirculating BOV which dumps into the barb in front of the filter.
:
Agreed!
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Old 04-30-2019, 12:42 PM
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Just cap them off unless you will run recirc bov. Get rid of that MAF if you on MS.
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Old 04-30-2019, 12:53 PM
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Originally Posted by Lokiel View Post
Second photo barb is for for venting the crank-case air cleanly.
ie. Hotside crank case barb -> Oil Catch Can -> AIr Intake Barb
Adding to this, the use of this port for a crank vent has some potential drawbacks. Unless your oil vapor separator tank is 100% efficient, oil vapor will condense inside the intercooler and gradually coat its innards. Oil is a relatively good insulator (as compared to aluminum), so this will decrease the efficiency of the intercooler.

Intercooled engines fare better when the crankcase ventilation system is left open to the atmosphere, through a filter / separator.
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Old 04-30-2019, 01:34 PM
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Are we sure that isn't the barb someone added to connect to the idle air control valve?
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Old 04-30-2019, 01:49 PM
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Originally Posted by sixshooter View Post
Are we sure that isn't the barb someone added to connect to the idle air control valve?
My assumption is that this is the IAC fitting:






That's a heck of an interesting looking pipe in general. I can't recall having ever seen it before. Any idea where it came from?

The mention of Link makes me think FM, but I thought that theirs had always been welded tube.
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