2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

where to route vacuum lines on intake funnel

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Old Oct 25, 2006 | 03:44 PM
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brio125's Avatar
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where to route vacuum lines on intake funnel

so i want to put in a smooth funnel to my turbo, which will end up removing three or 4 vacuum lines. I am not sure where to put them or can i just cap them off. does anyone have any pics of their setup, with the new placement of the lines. thanks
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Old Oct 26, 2006 | 04:03 PM
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Aaron Cake's Avatar
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Add nipples to your new TID for the vacuum lines.
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Old Oct 26, 2006 | 04:31 PM
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so, just cap them off? that's what i was thinking. it won't affect anything negatively?
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Old Oct 27, 2006 | 03:54 AM
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If they were okay to cap off, they wouldn't have been connected to the TID...

You have three lines, a big one for the BOV, a small one for the boost control solenoid and a small one for the PCV system. The two small ones can be left open-vented with no problem, but if you open-vent the stock BOV your engine won't idle. Connect it back into the new TID.
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Old Oct 27, 2006 | 04:03 AM
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i would run them all back into the intake, venting them to the atmosphere just makes a mess internally and externally.
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Old Oct 27, 2006 | 04:37 AM
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Actually it doesn't. The boost control solenoid obviously just discarges a little bit of clean air, and although you'd think you get oil coming out the PCV line, in my experience with two cars over many years, you don't.

Last edited by NZConvertible; Oct 27, 2006 at 04:39 AM.
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Old Oct 27, 2006 | 11:03 AM
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thanks Jason.
I will do what you have suggested.
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Old Oct 27, 2006 | 10:11 PM
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well, i've got no idle now. i hooked up a hose from the back of the apexi filter to the bov, i'm not sure what the problem is. could it be too long? or if the bov is not level could that be a problem? s5 TII
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Old Oct 27, 2006 | 10:39 PM
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The BOV has to be connected back in after the AFM, not before it. You've created a huge post-AFM vac leak, which is why it won't idle.

Last edited by NZConvertible; Oct 27, 2006 at 10:43 PM.
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Old Oct 27, 2006 | 10:55 PM
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you are right. i was sitting on the can at work about 25 min ago and i thought to myself, I bet i need to hook up the bov after the afm. then i thought about it some more and remembered that that is how it was before, I am glad that i was able to come to this conclusion, then to have you confirm it for me. it's funny how great epiphanies come in strange places like the bathroom.

thanks again.
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