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Underbody braces, turbos and more!

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 Post subject: Vacuum to bov
PostPosted: Thu Jan 28, 2016 9:19 pm 
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Joined: Thu Apr 30, 2015 8:40 pm
Posts: 50
Location: Los Angeles
So i finally managed to add my intercooler and piping/bov my question is how much vacuum are you guys getting at idle, i ask since im not getting any. While driving out of boost i can get up to 15hg and normally between 5-10 but nothing at idle. This concerns me with the bov when i close the throttle it might not relieve the excess boost. I still need to adjust the bov of course since im experiencing flutter. Im running a 226/395 cam motor has 1500 miles on vitara piston and a garrett gt15 turbo. Car idles and drives great and all lines have been replaced and verified with the stock vacuum diagram


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 Post subject: Re: Vacuum to bov
PostPosted: Fri Jan 29, 2016 12:16 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1170
Location: So Cal, USA
Is the throttle plate fully closed at idle?
Where did you tap in for the boost gauge? and BOV?
I'm guessing you tapped the wrong line.


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 Post subject: Re: Vacuum to bov
PostPosted: Fri Jan 29, 2016 12:58 am 
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Joined: Thu Apr 30, 2015 8:40 pm
Posts: 50
Location: Los Angeles
Ive got the throttle plate slightly cracked open
And bov is off the thick line to the vsv and gauge is off one of the small lines on top of thw intake manifold. Dont remember exactly which.ill double check in the morning


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 Post subject: Re: Vacuum to bov
PostPosted: Fri Jan 29, 2016 6:13 am 
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Joined: Mon Dec 01, 2003 12:47 pm
Posts: 11669
Location: columbus, ohio
i used a vacuum manifolding block and ran all my vacuum lines for map, bov, and instrumentation off that single vacuum source.

there are 3 ports on the rear of the intake manifold plenum, use the one in the center position of the 3 ports as it will give you the best average of vacuum and boost conditions.

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 Post subject: Re: Vacuum to bov
PostPosted: Fri Jan 29, 2016 9:19 am 
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Joined: Tue Feb 13, 2007 10:28 pm
Posts: 1170
Location: So Cal, USA
Quote:
there are 3 ports on the rear of the intake manifold plenum, use the one in the center position of the 3 ports as it will give you the best average of vacuum and boost condition


We are talking MK1 here, MK2 manifold is a different configuration. :wink:

Attachment:
vsvline.jpg
vsvline.jpg [ 85.34 KIB | Viewed 1625 times ]


The large line flagged by the red O is your best bet to tap into using your choice of
a manifold block or vacuum tees. I ended up using a series of vacuum tees to run the line
to the BOV and Boost Gauge. I got some cool step down ones to mate the different
ID hoses and in some places used a single male reducer as well. I didn't use
the manifold block method simply to reduce clutter, and have the shortest run
of hoses possible.

Quote:
gauge is off one of the small lines on top of thw intake manifold


Three lines on top of the throttle body won't work. You can see here where
they are just before, or right on the throttle plate. At idle, the throttle plate
is covering these ports. That's why you can read boost but not idle vacuum.
This is shown below as barely open.

Attachment:
TBBARELYOPEN.jpg
TBBARELYOPEN.jpg [ 249.99 KIB | Viewed 1625 times ]


and now open

Attachment:
TBOPEN.jpg
TBOPEN.jpg [ 195.85 KIB | Viewed 1625 times ]


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 Post subject: Re: Vacuum to bov
PostPosted: Sun Jan 31, 2016 2:28 pm 
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Joined: Thu Apr 30, 2015 8:40 pm
Posts: 50
Location: Los Angeles
Good deal, thanks for the reply and pics ill get it worked out this week and repory back


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 Post subject: Re: Vacuum to bov
PostPosted: Thu Feb 04, 2016 2:27 am 
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Joined: Thu Apr 30, 2015 8:40 pm
Posts: 50
Location: Los Angeles
So it turns out the rear passenger side port on the manifold is perfect I'm just lucky i didnt damage my turbo since the bov wasnt really going off for a few days!


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