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Old 09-03-2012, 02:27 AM   #1
cg4463
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Default 96 STI EJ20K vacuum line issue

So here's the deal. I am stationed in Japan and I just bought a 96 STi and it is only hitting about .5 bars of boost. I checked the vacuum lines and they seem to be all jacked up. I will attach a picture showing what I found.

First off there is just a single line going from the turbo housing to the wastegate with no T in it.

One of the lines coming off of the solenoid goes to the intake. Another one is just blocked off by a bolt screwed into it. And another one goes into another module which I don't know what it is and goes to the intake manifold.

What I really need is a diagram of the vacuum lines. All of the ones I have found pertain to a 3 port solenoid when mine is a 2 port.

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Old 09-03-2012, 03:09 AM   #2
i_c_the_light
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Wastegate pressure. **** can't remember which one goes where!
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Old 09-03-2012, 03:12 AM   #3
i_c_the_light
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Wait. You need a t-piiece between the wastegate and turbo nipple. The line with the screw in it hooks up to the t-piece too. Whether or not you need a restrictor pill I can't remember.
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Old 09-03-2012, 04:22 AM   #4
cg4463
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awesome, thanks a lot. Now I just need to find a damn T. I am new to Japan and I haven't found a parts store yet. I may just have to order one online and wait forever do you know if this would stop the car from running full boost? It's only running about 8 psi
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Old 09-03-2012, 07:48 PM   #5
Jarrod164
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If you put the turbo straight to the wastegate then you're going to have that 8 or so psi limit. There should be a boost controller in your picture but I can't tell if that circular thing is it or not. One line would go from the turbo into it and one would go from it back to the wastegate. No tee required anywhere. On the 20g's there is another line that goes from the resonator on the intake and does have a pill in it. If you run a manual boost controller you just put a screw in that line to block it off and the boost controller just has the two lines.
Perhaps you're missing an aftermarket controller in your car and the previous owner just put the turbo to wastegate connection and left the pill line hooked up to the old boost controller. I didn't notice any issues with the line hooked up but Rob mentioned to disconnect it and plug it off.
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Old 09-04-2012, 12:43 AM   #6
pmugabi
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You need a T between the turbo and wastegate. The restrictor is in the pipe between the turbo and T.
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Old 09-04-2012, 05:50 AM   #7
cg4463
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Quote:
Originally Posted by pmugabi View Post
You need a T between the turbo and wastegate. The restrictor is in the pipe between the turbo and T.

So just to be clear. Cut the line going from the wastegate to the turbo, put a T in and then connect the line that has the screw in it to the T. Correct?
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Old 09-04-2012, 07:10 AM   #8
pmugabi
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Correct. However, you will not achieve full boost till you put in the restrictor. Actually you might not notice any difference till you reinstall it.
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Old 09-04-2012, 04:43 PM   #9
TommyAtomic
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cg4463 ,

Have you already bludgened the crap out of the monkey responsible for the mess you describe or is your misguided revenge that you now own his or her car ?

You need to post a photo of your engine bay. You have only posted a photo of what appears to be an aftermarket horn and of your factory boost controller not being hooked up to anything.
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Old 09-05-2012, 07:22 AM   #10
cg4463
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Quote:
Originally Posted by TommyAtomic View Post
cg4463 ,

Have you already bludgened the crap out of the monkey responsible for the mess you describe or is your misguided revenge that you now own his or her car ?

You need to post a photo of your engine bay. You have only posted a photo of what appears to be an aftermarket horn and of your factory boost controller not being hooked up to anything.
Haha I don't know who is responsible for it, the only thing I can think of is that the person before the previous owner had a boost controller on it and when he sold it he just took it off and did a half assed job of reconnecting the vacuum lines. I will post more pictures soon.

Thanks for the help.
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Old 09-05-2012, 07:34 AM   #11
cg4463
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Does anybody know where to buy the pills? It looks like I need a .9mm for my car. I read of people using mig welder tips and it works fine. I can see this being a huge cluster f*ck....should be fun! Seem like I should just buy a MBC
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Old 09-05-2012, 10:15 AM   #12
Meeners
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on my car I have the wastegate going to my manifold post turbo and too a wastegate boost solenoid. That module you have pictured there is attached to the intake pre turbo i'e doesn't see boost on my car... Are you sure that line is supposed to see boost pressure? I can't tell but that looks like a purge control valve... Someone get the vacuum diagram from the fiche before we jump to conclusions...

I have the late model Ej20g which is pretty similar to the k it looks like... the below is from a similar thread... the bottom link is for an early g which is a little different (intake not under the manifold) but it might help.

Quote:
Originally Posted by Jarrod164 View Post
I've got some threads here that may help out a tiny bit:
Vacuum hose diagram:
http://forums.nasioc.com/forums/show....php?t=2220682

Some hose pics showing where they go:
http://forums.nasioc.com/forums/show....php?t=1047066
There are too many got damned purge and solenoid valves on this damned thing! lol... I want to unplug them all!!!!

Last edited by Meeners; 09-05-2012 at 10:23 AM.
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Old 09-06-2012, 03:47 AM   #13
cg4463
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Meeners, the picture you have attached isn't the same solenoid as mine. Mine doesn't have the valve on top like that one. Just two towards the bottom and another one coming off of another solenoid. Something has to see boost haha the ECU has to know somehow....right? I just wanna start all over.

All of the diagrams only show that one damn solenoid, not the one that is on my car. I haven't found a single picture on the internet that looks like mine
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Old 09-06-2012, 02:25 PM   #14
wrxstijdm
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Why don't you get a solenoid like the ones in the pics? Maybe they just put the incorrect one on your car?
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Old 09-10-2012, 03:38 AM   #15
cg4463
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Just to update, I was able to find a store that had T fittings and come vacuum line. I hooked it up for now without the pill and it's still running the same boost just like someone mentioned above.

I just got some mig welder tips today that are the same size as the pill (.9mm) and I am going to install it later and see how she goes.
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Old 09-10-2012, 08:05 PM   #16
elislider
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Quote:
Originally Posted by cg4463 View Post
Meeners, the picture you have attached isn't the same solenoid as mine. Mine doesn't have the valve on top like that one. Just two towards the bottom and another one coming off of another solenoid. Something has to see boost haha the ECU has to know somehow....right? I just wanna start all over.

All of the diagrams only show that one damn solenoid, not the one that is on my car. I haven't found a single picture on the internet that looks like mine
Quote:
Originally Posted by cg4463 View Post
Just to update, I was able to find a store that had T fittings and come vacuum line. I hooked it up for now without the pill and it's still running the same boost just like someone mentioned above.

I just got some mig welder tips today that are the same size as the pill (.9mm) and I am going to install it later and see how she goes.
internal diameter of the pill is actually 1.2mm. Go to the dealer and get it, part number 22326KA120.
also if you want to get the OEM hoses and T (not that it really matters but they are precut to the right lengths, and all OEM spec), then refer to this:
http://opposedforces.com/parts/impre...llustration_2/

look at the "Detail A" on the right, then the table of numbers, then scroll down to the corresponding part number.
For example the T fitting is (4) -> [7] -> 22315AA040
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Old 09-12-2012, 06:41 AM   #17
cg4463
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Thanks for all of the help elislider, I did notice that it runs just shy of 1 bar which is fine for me because it is an older car and I don't wanna blow her up haha. I will definitely look into that though. Thanks again!
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