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Old 03-31-2015, 08:19 PM   #1
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turbo vac lines diagram

Looking for a diagram for vacuum lines for turbo build everything is in the car but I'm in need of help on how to run lines my setup he's an external WG and a turbo with no vac source on turbo outlet also installing a manual boost controller and input would be helpful


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Old 03-31-2015, 08:28 PM   #2
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Welcome to FF. You'll need to post that in the forced induction section or a mod will move it for you. Great you have a svt.
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Old 04-02-2015, 02:04 AM   #3
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Moved to the Forced Induction Section.
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Old 04-02-2015, 07:16 AM   #4
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buy a vacuum block.

run all the lines to the vacuum block

done
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Old 04-02-2015, 07:29 AM   #5
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Quote:
Originally Posted by ffsvtt44 View Post
Looking for a diagram for vacuum lines for turbo build everything is in the car but I'm in need of help on how to run lines my setup he's an external WG and a turbo with no vac source on turbo outlet also installing a manual boost controller and input would be helpful
The external wastegate vac source should be directly from the intake manifold. You can tee off any vac source from the intake manifold for this. I'm currently using the evap solenoid for my source since the port is right on top of my cosworth manifold (it was the easiest to reach). Leave the wastegate top port open to vent to atmosphere and run the bottom port to the intake manifold vac source. Since it is a manual boost controller you can splice right into the ext. wastegate vac line and put the controller there; very simple. Just make sure the manual boost controller is orientated the right way.

For all other boost sources, a vacuum block is your best bet. Takes a 3/8" feed from the evap port on the intake manifold and allows multiple ports for different things. I use my vacuum block for my BOV and boost gauge. Some people will say you could use the vacuum block for the wastegate as well but I'm not too sure about that.

Hit up google for external wastegate vacuum diagrams. I'll try to see if I can get a picture at some point of my wastegate to intake manifold vac connection.
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Old 04-02-2015, 07:57 PM   #6
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I think I'm going to purchase a vac block and run it like you said with the wastegate ran separately I'm not at this part quite yet in my build I have been taking my time and just got the turbo bolted in but I needed info on this as it is coming up soon
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Old 04-02-2015, 10:52 PM   #7
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You never want to run the waste gate to a "t" you want a dedicated Vac line to the intake manifold , then you only have 2 other lines and that can be done off one port to the BOV and boost gauge , you dont need a Vac block for that

When you get ready give me a call and I will be glad to walk you through how to hook them up , the length of the WG line is critical as well

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Old 04-03-2015, 10:33 AM   #8
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Quote:
Originally Posted by 1turbofocus View Post
You never want to run the waste gate to a "t" you want a dedicated Vac line to the intake manifold , then you only have 2 other lines and that can be done off one port to the BOV and boost gauge , you dont need a Vac block for that

When you get ready give me a call and I will be glad to walk you through how to hook them up , the length of the WG line is critical as well

Tom
What's the problem with a "t" in the wastegate vac line? I guess technically I am running a straight line from the wastegate to intake manifold because my evap system is turned off and deleted so the solenoid just acts as a plug. I haven't had any issues with this since I turboed the car. But if someone were to t off from another source that used vacuum as well, what would be the issue?
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Old 04-03-2015, 11:48 AM   #9
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The more chances you have for another line to come loose or get a hole , line to BOV , to boost gauge to anything else , if you loose Vac/boost to the waste gate and you hard in boost your waste gate will not work and you will go to about 30+psi and BOOM in a split second
By doing a dedicated hose from intake to WG you take less chances of hoses coming loose or leaks , the hose length also makes a difference and the more you have off that line the longer it makes the hose

With a short hose you have less boost bouncing when the waste gate comes in and it holds the boost a little more steady and accurate

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Old 04-04-2015, 06:28 PM   #10
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Also you should not use the 'ebay' silicone vacuum line. It does NOT hold up well to underhood temperatures. Get reinforced fuel line for all connections. Probably a good idea to replace the wastegate line every year or two.
Co-worker had a split on the line to the wastegate and he is in the process of a rebuild due to 30+psi spike in a second...
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