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

where is the best vacuum line to tap for a boost gauge??

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Old Sep 23, 2004 | 11:17 AM
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where is the best vacuum line to tap for a boost gauge??

I was going to run it off the pressure sensor . is this a good place?? i would think its the most accurate . but if there is any better places please let me know
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Old Sep 23, 2004 | 11:22 AM
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UIM, don't tap a line.
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Old Sep 23, 2004 | 11:24 AM
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there is a capped line right next to where the feed for the pressure senor comes off the block. would that be better since there is nothing attached to it ??
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Old Sep 23, 2004 | 11:25 AM
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Pay attention to where it goes. If its on the UIM, then it should work for you. If not, there should be at least one nipple on the left side of the UIM that you could place the line on
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Old Sep 23, 2004 | 11:28 AM
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this is the line i was going to use ,, pull the cap
Attached Thumbnails where is the best vacuum line to tap for a boost gauge??-nh-trip1.jpg  
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Old Sep 23, 2004 | 11:33 AM
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Originally Posted by alwayssideways
this is the line i was going to use ,, pull the cap
Nope, don't use that one. Look on the side of the UIM...there should be a nipple sticking out.
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Old Sep 23, 2004 | 11:34 AM
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drivers side or passenger side?
and should i take off the TMIC?
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Old Sep 23, 2004 | 11:37 AM
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Passanger side, right near where the UIM and LIM meet. Your also gonna want to look near the rear if you can't find any on the side. I honestly can't remember where they are on the FC since I haven't driven mine in forever, but on the FD, they're on the UIM right near the LIM/UIM connection.
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Old Sep 23, 2004 | 11:47 AM
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i found a bunch of nipples with hoses comming off. should be looking for capped nipples??? cuz thats what im doin g.. if not then i think i found the place where im going to "T" into the line
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Old Sep 23, 2004 | 11:48 AM
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Originally Posted by alwayssideways
i found a bunch of nipples with hoses comming off. should be looking for capped nipples??? cuz thats what im doin g.. if not then i think i found the place where im going to "T" into the line
Yeah, look for the capped ones.
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Old Sep 23, 2004 | 12:00 PM
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dude i looked and looked and there is only one capped nipple thati can find on my whole car .. and its the one i took a pic of in above post. im lost
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Old Sep 23, 2004 | 12:06 PM
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Originally Posted by alwayssideways
dude i looked and looked and there is only one capped nipple thati can find on my whole car .. and its the one i took a pic of in above post. im lost
Just T a vaccuum line off the UIM or TB area. That will work.
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Old Sep 23, 2004 | 01:52 PM
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On FCs the nipple near where the UIM and the LIM meet near the BAC is the blowoff vacuum line, don't remove that line.
Look through the FSM and find a nipple on the back of the UIM, either tee of it, or remove emissions equipment and you'll have like 6 you can use.
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Old Sep 23, 2004 | 11:38 PM
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i ended up using one that was right infront of the firewall under the tb cable swivel . works pretty well i have to still run power to it temporarly till i get my pod
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Old Sep 24, 2004 | 12:15 AM
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I had mine teeded into my Boost sensor and BOV line, but are there any nipples on the back of the UIM that read vacuum and boost?
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Old Sep 24, 2004 | 01:41 AM
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Originally Posted by 95R2-89TII Ground Zero
UIM, don't tap a line.
There's nothing wrong with tapping into a line.

Look on the side of the UIM...there should be a nipple sticking out.
And it should have the BOV line on it...

Originally Posted by Impreza2RX7
...are there any nipples on the back of the UIM that read vacuum and boost?
Yes, one. It's the one directly behind the TB at the bottom, and it normally feeds the TB's double throttle system. That line would be okay to tee a boost gauge into, but keep it on the manifold side of the green check valve. The pressure sensor would be fine too, but it's a longer hose.

Last edited by NZConvertible; Sep 24, 2004 at 01:44 AM.
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Old Sep 24, 2004 | 10:37 AM
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Originally Posted by alwayssideways
i ended up using one that was right infront of the firewall under the tb cable swivel . works pretty well i have to still run power to it temporarly till i get my pod
Good to hear you got it working. Sorry for the confusion
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Old Sep 24, 2004 | 03:40 PM
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From: Hartford
its cool ,, you helped out alot ,, i would have tap'ed the pressure sensor all the way over on the pass. side of the car.. not i have alot more hose to mount the gauge in a better place
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Old Sep 25, 2004 | 01:20 AM
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whats the matter with the stock boost guage?
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Old Sep 25, 2004 | 01:38 AM
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Originally Posted by vice
whats the matter with the stock boost guage?
maybe he has a fcd.
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Old Sep 25, 2004 | 02:21 AM
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I guess I'll run my boost gauge from the nipple on the back of the UIM since I did the TB mod. I have 2 tees on my BOV/Boost sensor line and it looks crappy..

Vice, most people like reading boost as bar or psi. My boost gauge was the first thing I bought for my car, since I don't like doing conversions in my head while I'm driving..
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Old Sep 25, 2004 | 10:16 AM
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yeh, i guess i dont like that either.
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Old Sep 25, 2004 | 10:27 AM
  #23  
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From: Hartford
yes i have a fcd
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Old Sep 25, 2004 | 06:24 PM
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Originally Posted by vice
whats the matter with the stock boost guage?
It's inaccurate, the bottom part of the vacuum side is missing, and it has no scale. There's basically no way to tell how much boost you're actually running at any one time. It's fine for a stock car but it is useless for a modified one. If you're increasing boost (i.e. doing any mods) it's very foolish to not have a decent aftermarket gauge.
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Old Sep 25, 2004 | 11:15 PM
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From: Hartford
here is a example. on my stock boost gauge the needle will be just above -20 for vacuum . and the aftermarket boost gauge with be at like 3.5 psi. big difference
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