(Picture attached) Is this the correct routing of vacuum lines?
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Teching In
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(Picture attached) Is this the correct routing of vacuum lines? Is this the correct plumbing of vacuum lines for a single turbo setup?
(turbo, external wastegate, blow off valve, manual boost controller)
(turbo, external wastegate, blow off valve, manual boost controller)
Thread Starter
Teching In
Joined: Dec 2016
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I wrote the sticky on vacuum/boost gauge and WG/BOV setup lol. Theres a bunch of pictures in there.
TECH Enthusiast
Joined: Jan 2012
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From: Bowling Green KY
Cory, I would suggest that you do some research, not just how to set up the vacuum lines, but to understand why you would want a vacuum line on something. Sure you could just follow a diagram, or do what the people are going to suggest to you in this thread, but you really won't understand why you doing this, if you just follow a diagram someone else made up. I give you credit, you did come up with your own, so you are thinking about it. Looking at your diagram, a question you should ask yourself is "What would the purpose of a vacuum line going from the compressor housing to the intake manifold serve?" The vacuum tree is just an extension of your intake manifold for practical purposes. You already have about a 3" line running from the compressor housing to the intake manifold, via the intercooler, and the throttle body. I'm not trying to be condescending, just from personal experience, I don't want to build something, and not really understand how and why it works. That is the best part of our hobby, learning what makes it tick, and how to make it tick faster. Exhaust leaks exempt here though.
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Teching In
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Sorry guys I've been super busy putting this engine together and my buddy and I swapped it on Saturday. I honestly just didn't have time to do any research at the moment but I think I've got it all figured out.
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Won't hurt. I have my FPR seeing vacuum and boost. Seeing vacuum pulls a couple psi out of the base pressure. Contributes to helping with idle fueling, but not absolutely necessary in all cases.
On The Tree
Joined: Feb 2015
Posts: 136
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From: columbus ohio
Im at the same place on my build as this guy is and was told from some other racers that they like running the line off the waste gate to the cold air pipe or off the turbo? What is your thoughts on that? Was told they like it that way best because of what was stated already? ( pulls a couple psi out of base)? Just fishing for info before I go either way?
Hes talking about the fuel pressure regulator being hooked to the intake. It makes fuel pressure go up with boost and will make fuel pressure a little lower under vacuum. Thats what he means by takes a little off the base.
The wastegate should not see vacuum, so it should be sourced before the throttle body. Ie turbo or intercooler pipe
The wastegate should not see vacuum, so it should be sourced before the throttle body. Ie turbo or intercooler pipe
On The Tree
Joined: Feb 2015
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From: columbus ohio
Hes talking about the fuel pressure regulator being hooked to the intake. It makes fuel pressure go up with boost and will make fuel pressure a little lower under vacuum. Thats what he means by takes a little off the base.
The wastegate should not see vacuum, so it should be sourced before the throttle body. Ie turbo or intercooler pipe
The wastegate should not see vacuum, so it should be sourced before the throttle body. Ie turbo or intercooler pipe
Thread Starter
Teching In
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c5z, I hooked up the vacuum lines and the T while the engine was out but honestly it doesn't look too bad back there. I had my hands back there plugging in the MAP sensor and other 2 sensors.
lol, i can't do that on an fbody. no way to get my hands back there. i have to pull the intake.
I've routed my manual boost controller like that and it was very inconsistent. I'd run the bottom port of the WG directly from the turbo, or, if you want a true manifold pressure reading, take it from there instead.
The way you have that plumbed now, your boost controller will be controlled backwards. meaning, you'll need it set it at "Max Pressure" to get the WG spring pressure with the lowest boost setting.
The best way to route that controller is to the top of the WG. Then, you can slightly adjust little by little from there without taking a risk of overboosting your engine.
I blew up my last motor on the dyno because my manual BC was plumbed this way. I should have ran it to the top of the WG instead.
I'm always learning, so I'd like to know if there's an issue either way, thanks.