A vacuum hose reference for EJ22Ts

Snorkus, filters, throttle bodies and intake manifolds.

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vrg3
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A vacuum hose reference for EJ22Ts

Post by vrg3 » Mon Feb 16, 2004 12:20 am

I've been meaning to do this for a while... Today I drew up a diagram of EJ22T vacuum hoses:

http://www.surrealmirage.com/vrg3/vacuum/

I left off the IAC hose and the big BOV hoses since they're simple. I left off the PCV stuff since it's complicated. :)

Hopefully this will be useful for people doing swaps and/or replacing their hoses.

Please send me corrections if I got any of it wrong.
Last edited by vrg3 on Tue Jun 09, 2009 8:27 pm, edited 1 time in total.
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Post by LegacyT » Mon Feb 16, 2004 12:31 am

Perfect!! Thank you.

Mark,
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Post by evolutionmovement » Mon Feb 16, 2004 12:33 am

Wicked awesome! (might as well talk like a Bostonian) I could have pieced it together from the manuals, but having the diameters is a real help!

Thanks.

Steve
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Post by vrg3 » Mon Feb 16, 2004 12:50 am

You're welcome. :)

I pieced it together mostly from memory but then revised it with the service manuals, parts catalogs, and quick trips out to my car.

Metric hose can be hard to find, but I think these substitutions ought to do okay (especially if you use silicone since it's very flexible and stretchy):

3.5mm <-> 1/8"
4mm <-> 5/32"
5.5mm <-> 7/32"
7.5mm <-> 1/4" or 5/16"
10mm <-> 3/8" (though, since the brake booster hose needs a check valve, you may as well use an OEM hose)

I'd try to keep the boost control hoses as close as possible to stock diameter and length so the ECU's calibration remains correct.
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Post by vrg3 » Mon Feb 16, 2004 6:14 pm

Update: I added to the page a separate diagram of the PCV system I made by combining two pages from the parts catalog.
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Post by Legacy777 » Mon Feb 16, 2004 7:17 pm

nice work!
Josh

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Post by eastbaysubaru » Mon Feb 16, 2004 8:09 pm

Great resource. Thanks vrg3!

-Brian
'04 PSM FXT

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Post by vrg3 » Mon Feb 16, 2004 9:23 pm

Thanks, guys.

Whichever of you is the first to make good use of it, I would really appreciate it if you could either confirm or correct all the info afterwards.
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Post by ciper » Wed Feb 18, 2004 1:10 am

Lengths would be great, or a total amount to purchase if I wanted to replace it all.

Since my engine is in a thousand parts anyways I might as well.

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Post by vrg3 » Wed Feb 18, 2004 1:31 am

The thing is, most of the stock hoses are vulcanized, so knowing their stock lengths won't necessarily be useful.

The next person to replace all the hoses with bulk hose can try to give us the lengths they used that worked without kinking or getting in the way of other stuff; I can add them to the diagram.

If you can afford it, I think you should consider buying some or all of the stock hoses new.
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Post by QuickDrive » Wed Feb 18, 2004 5:32 am

Very cool!!

now with those sizes I can replace em with silicone eventually.

Good job Vrg3
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Post by evolutionmovement » Wed Feb 18, 2004 7:47 am

I need to do nearly all the hoses so I'll try to measure everything out. Engine is progressing slowly, though. Damn jobless recovery!

Steve
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Post by legacy92ej22t » Fri Feb 20, 2004 4:40 pm

Sweet, good idea vrg3! :D

I too would like to eventually replace all my lines.
-Matt

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Oh... and I hope the fucker get bunked with Gunter, arrested for raping Gorillas.[/quote]

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Post by vrg3 » Tue Feb 24, 2004 2:58 am

First correction: There's a 2mm restrictor in the wastegate bleed hose. I've updated the PNG and PDF.
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Post by vrg3 » Fri Feb 27, 2004 12:54 am

Wow, that restrictor is pretty important.

I had been running with hoses of approximately the right diameter but without the restrictor in the hose between the wastegate control solenoid and the resonator. Boost control didn't seem that precise; it seemed like it would spike a bit and vary in different gears or at different engine speeds. I tried cleaning out the solenoid and it helped a little, but...

Today I put a restrictor in (I drilled a 5/64" hole in a little piece of steel rod I had) and it really cleaned up the boost control a lot.

So anyone who has replaced their vacuum hoses but didn't notice the restrictor, I recommend replacing it. :) I would imagine that if you left out the union fitting in between the solenoid and compressor outlet it might show similar symptoms.
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THANKS!!!!!!!

Post by Legacytuner » Mon Mar 01, 2004 2:13 am

I recently installed a DNA MBC. I got rid of the stock hose and replaced them with silicon. my boost was all over the place virtually uncontrollable
good thing i didnt throw away the restrictor i put it back in and wow 12psi
solid thanks!!!!
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Post by vrg3 » Tue Mar 02, 2004 3:59 am

Huh, that's kind of odd... I would expect most MBCs to work best with simple, short, unrestricted tubing. You're not running your MBC along with the factory boost control, are you?

That's cool that it's behaving how you want though. :)
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Post by boostjunkie » Tue Mar 02, 2004 7:46 pm

Yeah, I don't have the restrictor in mine. It works fine, when I can boost.

Speaking of which, how do you get to hose 11 in the pcv vaccum tubing?
[url=http://www.angelfire.com/md3/91turbolegacy/images/On_the_Lawn.jpg]1991 Legacy Turbo (RIP)[/url]

[url=http://www.angelfire.com/md3/91turbolegacy/images/Summer_Car_Wash3.jpg]2000 Celica GT-S[/url]

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Post by vrg3 » Tue Mar 02, 2004 10:11 pm

I think you can get at it if you just remove the alternator.
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Post by boostjunkie » Tue Mar 02, 2004 10:48 pm

Gotcha.

I also noticed that Adam plugged the inlet for the PCV at the corner of the right angle of the inlet boot. Then there's a single inlet from the PCV valve into the bottom of the block. No T in that section.

What would this do to the operation of the PCV system?
[url=http://www.angelfire.com/md3/91turbolegacy/images/On_the_Lawn.jpg]1991 Legacy Turbo (RIP)[/url]

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Post by vrg3 » Tue Mar 02, 2004 11:52 pm

I'm not sure; I don't fully understand the PCV system.

My guess, though, is that you're not getting positive crankcase ventilation when you're on boost. It looks like that fitting is where crankcase vapors get sucked in by the partial vacuum at the compressor inlet when manifold vacuum is absent.
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Post by NICO » Tue May 11, 2004 4:19 am

vrg3 you see your pic of the vacum lines on the valve covers which one can i put a catch can on so i dont get oil in my turbo.
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EJ22T, STi EJ207 DOHC, Vi-PEC (Spare Autronic) @ 426.20HP / 394.94ft lb @ 00psi
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Post by vrg3 » Wed Sep 08, 2004 3:10 pm

I just updated the diagram. There were two errors before -- the canister's main purge line was indicated to be on the wrong fitting, and the brake booster hose was labeled as 10mm rather than the 11/32" it actually is.
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Post by Tleg93 » Tue Mar 29, 2005 5:47 pm

It would be nice to have a BOM for these hoses too. If someone had a scanner and was so inclined they could scan some pages out of the factory service manual or Haines. If this has been done I apologize.
--Scott--

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Post by vrg3 » Tue Apr 05, 2005 6:22 pm

By bill of materials, you mean a price for each of the part numbers? Cuz the service manuals don't have them.

Or do you mean lengths, so you can use bulk hose to replace them? Part of the problem is that you kind of have to reroute them if you don't use premolded hose.
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