On3 turbo vacuum lines - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 8 Old 10-07-2016, 12:32 PM Thread Starter
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On3 turbo vacuum lines

Hey guys, I hope I can get some help here. I just finished installing my first turbo ever on my fox body. Can someone explain how to run the vacuum lines of the wastegate and bov? I also purchased one of those cheap amazon boost controllers and gauge. If it makes a difference, I am running a Holley Terminator EFI, that should be good for at least 10 pounds of boost.

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post #2 of 8 Old 10-07-2016, 01:07 PM
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Welcome to the dark side. I can't comment on Terminator because I haven't researched it or it's power capacity but I imagine it should support 600hp at least so you should be fine on 10psi. 5spd or auto car?

as for the lines, there are multiple ways to run them on the gate and it depends on what type of boost controller you bought. can you post a link to it for us to see?

The BOV should basically have one line ran to the intake manifold. It needs a vacuum to keep it open while engine is in vacuum and it'll close when boost hits the manifold, so as not to leak any pressure.

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post #3 of 8 Old 10-07-2016, 01:31 PM Thread Starter
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https://www.amazon.com/gp/aw/d/B00VH...BXL&ref=plSrch

It is a 5 speed. The victor jr intake that I have does not have any taps for vacuum. Can I use the vacuum port that is on the firewall?
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post #4 of 8 Old 10-07-2016, 01:40 PM Thread Starter
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I'm looking at the car right now and I have the top port on the bov going to the firewall vacuum port. Would the wg side port tee off with that line?
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post #5 of 8 Old 10-07-2016, 03:00 PM
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Okay, the "Log" on the firewall is fine for BOV and boost gauge if it's being supplied vacuum from the intake manifold ultimately. Maybe post a picture of that to verify?

Don't route the gate to the same log. The gate should get the best signal which is usually directly from the compressor housing of the turbo.

Should look something like this


The hose that goes to the gate itself should be plumbed to the bottom port of the wastegate, not the top port.
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post #6 of 8 Old 10-07-2016, 03:49 PM Thread Starter
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Cool, that makes sense and yes it's the log on the firewall. The diagram helps a lot, but what if my compressor housing does not have a tap to run a vacuum line to it? Should I tap it myself?
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post #7 of 8 Old 10-07-2016, 04:14 PM Thread Starter
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Ok, so I fixed the vacuum for the bov and boost gauge
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File Type: jpg IMG_0977_1475871245978.jpg (106.1 KB, 41 views)
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post #8 of 8 Old 10-07-2016, 05:47 PM
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Quote:
Originally Posted by snakeeyesmustang302 View Post
Cool, that makes sense and yes it's the log on the firewall. The diagram helps a lot, but what if my compressor housing does not have a tap to run a vacuum line to it? Should I tap it myself?
Drill/tap the compressor housing. There should be a boss casted into the housing that gives you something flat to drill into before tapping. See below





Quote:
Originally Posted by snakeeyesmustang302 View Post
Ok, so I fixed the vacuum for the bov and boost gauge
Looks okay. I see an open port on that log that needs to be capped. Make sure you have absolutely no ports within the vacuum circuit open. Also put a zip tie around every vacuum/boost line. When that thing comes into boost those caps will go flyin.
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