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Old 06-08-2006, 10:35 AM   #26
jdgrimm
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Quote:
Originally Posted by mnrstrider
Nope no ideas, but I though I bump this, because I plan on building one or borrowing one locally soon I know I have a leak, I gotta find it.

-Nick (xcelor8 on mnsubaru)

hey nick,
you can borrow it whenever you need. pm me on here.
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Old 06-08-2006, 10:54 AM   #27
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What are you guys using to cap off the inlets (PCV, etc) on the turbo inlet hose?
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Old 06-08-2006, 11:00 AM   #28
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i thought i read above that you dont need to cap them off, maybe i'm mistaken.
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Old 06-08-2006, 12:34 PM   #29
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Quote:
Originally Posted by jdgrimm
i thought i read above that you dont need to cap them off, maybe i'm mistaken.
Plug them...
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Old 06-08-2006, 01:23 PM   #30
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Quote:
Originally Posted by KmanRuffian
Plug them...
ok, i'll give that a try and retest tonight.
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Old 06-27-2006, 01:43 PM   #31
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The 2" fitting wont work with the Stock turbo inlet tube. I also would not force anything in there as the inside has a meatl ring lining it. You need to track down a basic silicone/rubber hose at Lowes to go OVER both the inlet and the PVC. Use the stock clamps to hold it in place.
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Old 06-27-2006, 03:38 PM   #32
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Quote:
Originally Posted by Valhakar
The 2" fitting wont work with the Stock turbo inlet tube. I also would not force anything in there as the inside has a meatl ring lining it.
Actually, it works great with the stock inlet and makes a great seal that will hold pressure for several minutes.
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Old 06-27-2006, 03:47 PM   #33
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i dont have a stock inlet. i plugged all of the lines coming out of the inlet hose, still wont hold pressure so i gave up.
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Old 06-27-2006, 03:59 PM   #34
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the idea is to figure out where all that air is going. . .that's the point of this test.
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Old 06-27-2006, 04:21 PM   #35
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I built it and had to run to the store to get the mentioned hose

The outer diameter of both were an exact match.
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Old 06-27-2006, 07:09 PM   #36
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Quote:
Originally Posted by nhluhr
the idea is to figure out where all that air is going. . .that's the point of this test.
yes i understand the point of the test. However, i dont think there are any major leaks in the system now that i have my stock ic back on, but i am just trying to use it to see if there are any tiny leaks. If there were any tiny leaks it should still hold some psi for at least a few seconds, but its not holding even 1psi for 1 second after i put air in. also i cant hear any leaks when i'm trying to fil up. i dont know...could it be possible air is getting passed the butterfly on the throttle body? i did some minor porting of the tb but didnt touch the area where the butterfly sits.
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Old 06-27-2006, 07:10 PM   #37
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Quote:
Originally Posted by jdgrimm
could it be possible air is getting passed the butterfly on the throttle body?
absolutely - it is not an airtight seal by any means. It should hold pressure up to the valves though.
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Old 06-27-2006, 07:14 PM   #38
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ok, if its getting passed the tb this could start to make sense. a month ago i broke of a nipple that is behind the power steering pump...a hose on the front left of the intake mani went to it. i've been throwing a CEL but havent had the time to fix it so i just put a screw in the hose that was coming out of the mani. hmmm
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Old 06-27-2006, 07:19 PM   #39
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there's your leak You realize that is allowing unfilter/unmetered air into the manifold while under vacuum and leaking boost under throttle, right?
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Old 06-27-2006, 07:37 PM   #40
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yes i do understand. the part i didnt understand is that so much air could pass through the tb that i wouldnt even get a reading in the leak test.

turns around and sits in corner
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Old 06-28-2006, 12:03 AM   #41
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before I do this let me make sure I got everything right. Its a 2" pipe for the stock inlet?
I need to plug all lines on inlet? Do I need to plug anything else or is that it? thanks
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Old 06-28-2006, 09:32 AM   #42
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When I tested mine the same exact thing happened and I don't have the broken nipple.

The air would go....somewhere.
So fix it and see if anything changes. I think the engine stops in such way that on one of the cylinders you have valves partially open on both sides. I suggest that if anyone is doing tests right now, have a friend by the muffler to listen for the air coming out.
If you can't create a situation where 20 PSI is somehow pressurizing the intercooler and ajacent hoses, then I don't think it's a good test. Only once the pressure builds up close to this will you hear leaks.
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Old 07-05-2006, 10:57 AM   #43
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Its not a 2" pipe for the stock inlet. Tried it last night, way to small(on a 2002 wrx anyway). The outer diameter of the inlet that the airbox hose slides on over is about 2.9".

What is the best way to plug/cap all the inlet lines?
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Old 07-05-2006, 01:30 PM   #44
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Quote:
Originally Posted by subarwho?
Its not a 2" pipe for the stock inlet. Tried it last night, way to small(on a 2002 wrx anyway). The outer diameter of the inlet that the airbox hose slides on over is about 2.9".

What is the best way to plug/cap all the inlet lines?
dunno how many times this needs to be said, but YES it IS 2". You don't put it over it, you jam it inside. The reason is because you'll be pressurizing it. If you put it over the inlet, it will expand and blow itself off. If you put it inside the inlet, it will expand and seal itself tighter.
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Old 07-05-2006, 06:15 PM   #45
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That's pretty neat. Now someone make something like this for the exhaust side
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Old 07-21-2006, 10:51 PM   #46
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id liek to give this a try but not sure what exactly is going on here. are you disconnecting the airbox and attaching the cap to pressurize the system there? and do you just leave everything else as is? do you have to plug any thing else or will the system make a seal on its own? also i read some concerns about pressurizing the crankcase, why is this bad?
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Old 08-09-2006, 01:44 PM   #47
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I spoke to a friend who completed the test successfully on a Mitsu 3000 GT, VR4. It is important to disconnect and plug the PCV. That will cause the crank case to pressurize, including the oil pan. That in turn could lift oil seals off of their seat and cause oil leaks.

I don't want to sound like too much of an alram, but, I would reccomend you don't try this test anymore UNLESS you disconnect the PCV and plug it first. I am sorry I didn't think of it before.
Also, the friend indicated that the place through which the air pressure "vanishes", is the oil fill cap.

He had some comments about the injectors possibly lifting off of their seals, even after taking care of the PCV route, but neither him nor me were convinced that this was going to be a serious problem.
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Old 08-09-2006, 02:05 PM   #48
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Doesn't the PCV CLOSE under boost pressure
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Old 08-09-2006, 02:17 PM   #49
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Quote:
Originally Posted by djerickd
Doesn't the PCV CLOSE under boost pressure
But when you pressurize the system from the inlet you are creating boost inside the inlet tube where there is normally a vacuum. That will reverse the flow of air to the PCV and cause crankcase to be pressurized.
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Old 08-09-2006, 02:23 PM   #50
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Ahh, in the stock configuration yes. Mine is a little different setup. I would remove all the lines from the inlet and cap them all as they all normally see vacuum. You could do one way check valves but that could get pricey...

I think the best approach would be to pressurize the actual turbo compressor inlet vs. the inlet tube. Actually I want to remove my TMIC and pressurize directly at the TB.
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