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Vac/boost ?????

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99dakRT

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Discussion starter · #1 ·
Tomorrow I'm going to hook up my fuel pressure and vac/boost gauge.
I was wondering what vac line I should hook my vac/boost gauge into?
Does it matter which one or would I get a boost reading off all them?

Just curious how everyone else hooked theirs up because I've never messed
with one before.

Also does it matter what size vac line I run to the gauge?
I have an 1/8" but didnt know if there was in advantages/disadvantages to the size.

Thanks:drive:
 
Discussion starter · #3 ·
Hinshaw said:
On my WRX I took a T connector right before the Bypass Valve (same as Blow off valve)
Click to expand...
Well I dont have my turbo installed yet. I was just trying to do some of the smaller stuff to get it out of the way.

I didnt know if I could just install a T-fitting in any of the vac hoses behind the intake manifold
 
Discussion starter · #5 ·
After looking for like 30 seconds I realized that there is already a unused port directly into the stock kegger. It only took about 5 minutes to get my boost/vac gauge hooked up.

How much vac should I be getting at idle. Does 16-17 sounds about right?
 
#6 ·
99dakRT said:
After looking for like 30 seconds I realized that there is already a unused port directly into the stock kegger. It only took about 5 minutes to get my boost/vac gauge hooked up.

How much vac should I be getting at idle. Does 16-17 sounds about right?
Click to expand...
20"mg should be about right. 16 sounds a little low.
 
#7 ·
16 does sound a bit low. Are you running the factory cam? Whats your idle speed? Sounds like there could be a leak in between your gauge and vaccumm port.
 
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Discussion starter · #8 ·
mopar318 said:
16 does sound a bit low. Are you running the factory cam? Whats your idle speed? Sounds like there could be a leak in between your gauge and vaccumm port.
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Yeah everything is still factory, just gettin ready for the turbo. My idle speed is about 600 RPMs. I dont have teflon tape around the adapters hooking into the gauge. Think that could be my problem?

If I'm cruising its between 10-15. If I let off the gas and coast its around 20.
 
#9 ·
99dakRT said:
Yeah everything is still factory, just gettin ready for the turbo. My idle speed is about 600 RPMs. I dont have teflon tape around the adapters hooking into the gauge. Think that could be my problem?

If I'm cruising its between 10-15. If I let off the gas and coast its around 20.
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That sounds about right. You only need teflon if its a pipe fitting.
 
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#11 ·
99dakRT said:
I'll put some on there tomorrow and see if it helps my vac reading at idle
Thanks man
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I suggest Loctite thread sealer (not thread locker). It comes in a little white tube and its about 3 bucks. Stuff works awesome. Loctite had a seminar here at school and showed us all the products. Got some good stuff.
 
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Discussion starter · #12 ·
mopar318 said:
I suggest Loctite thread sealer (not thread locker). It comes in a little white tube and its about 3 bucks. Stuff works awesome. Loctite had a seminar here at school and showed us all the products. Got some good stuff.
Click to expand...
If I get a chance I'll pick some up tomorrow at ace hardware. I have teflon tape on my fuel pressure sending unit and it started leaking today so I'll throw the thread sealer on it while I'm at it.

Are you runnning an oil pump on your return line from your turbo? If so what kind did you go with? What size line would you recommend to and from the turbo. Should I go bigger with the return line?
 
#13 ·
mopar318 said:
I suggest Loctite thread sealer (not thread locker). It comes in a little white tube and its about 3 bucks. Stuff works awesome. Loctite had a seminar here at school and showed us all the products. Got some good stuff.
Click to expand...
they tell you how it causes hair loss? our guy wouldnt shut up about it...
 
#15 ·
KREWZER said:
they tell you how it causes hair loss? our guy wouldnt shut up about it...
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I think he was saying something about the activator for the the thread locker being really dangerous and burning your skin and what not. The demonstration with the thread sealer was really cool. Where he applied the thread sealer. Unscrewed the fitting 3 or 4 times. Put it hand tight, and it held 3000psi of pressure.

It sold me, and the stuff work like he showed.:D
 
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#16 ·
99dakRT said:
If I get a chance I'll pick some up tomorrow at ace hardware. I have teflon tape on my fuel pressure sending unit and it started leaking today so I'll throw the thread sealer on it while I'm at it.

Are you runnning an oil pump on your return line from your turbo? If so what kind did you go with? What size line would you recommend to and from the turbo. Should I go bigger with the return line?
Click to expand...
No you want need a scavenging pump if your turbo is above the oil pan, and it has an easy flow into the pan. You should use 5/8" return line. 1/2" at minimum.

Also I don't think Ace will have that sealer at ace. Go to advance auto, or autozone. It works great for fuel lines. I had leaks as well, the sealer from loctite solved my problems.
 
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#19 ·
99dakRT said:
Glad you said something. That would suck if I wouldnt have known and had it on my hands and rubbed my head or something.
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The thread sealer is not thin. Its more of a paste. But thinner than pipe dope.
 
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mopar318
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