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Old 02-05-2001, 03:02 AM   #1
Scooby Newbie
Member#: 3603
Join Date: Jan 2001
Location: St. Paul MN
Question Vacuum Tube on 98RS Intake.... what to do?

Okay.... I've been in contact with kartboy about getting the MAF Mounting Brackets. So hopefully, I'll have that little prob fixed soon.

But today, I went to replace the stock intake, and found how much of a pain it'll be to mount the vacuum tube that connects underneath in intake. So my buddy (who has a tuned as sin Si) and I were looking for other options on mounting the tube without restricting airflow, and without causing any other issues.

Any ideas? I can get some pics of what I'm talking about posted after I take em.
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Old 02-05-2001, 09:43 AM   #2
Scooby Specialist
Member#: 2024
Join Date: Aug 2000
Chapter/Region: NESIC
Location: South Portland, ME
2005 Legacy 2.5i
Atlantic Blue Pearl


Are you talking about the vacuum tube that's larger than the others? When I installed my intake (I have a 98 as well), the large hose was kinking because of the different angle it had to be to connect to the intake. I tried a stiffer hose and the same thing happened, so I just took one of those metal hose claps (the kind you screw to tighten) and put it around the part that was kinking. It forced that part to be just as round as the rest, and it works great.
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Old 02-05-2001, 12:14 PM   #3
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Member#: 145
Join Date: Aug 1999
Chapter/Region: MWSOC
Location: The Windy City
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If I'm understanding this correctly, you can just get some plastic tee fittings at home depot to connect those three hoses together and then connect it to a crankcase breather element that you can buy from AutoZone or some other autoparts stores.
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Old 02-05-2001, 06:53 PM   #4
P.K. Motorsports
Scooby Specialist
Member#: 1110
Join Date: Mar 2000
Location: USA
1999 RS


The 12mm tubes on the crankcase are called more-air vents and you can put those directly to a small breather element. I have mine on about 3" of 1/2" heater hose going to small breathers (which, that reminds me, I need to replace).

The larger one is a passage into the crankcase which is used for the PCV system. Controversy swirls around whether it is OK to route that one to a breather, but most seem to think it is OK. I have mine using a breather with a 90 degree angle neck leading to a 3/4" road tube which terminates down by the passenger side halfshalf dust cover.

If you do this you get a noticible but not intolerable exhaust scent in the cabin whilst sitting still with the HVAC on the "outside air" setting. To plug the tubes in the intake I found small vinyl caps at Home Depot which were just the right size. Enjoy!
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Old 02-05-2001, 10:37 PM   #5
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Member#: 3603
Join Date: Jan 2001
Location: St. Paul MN

exactly what I was talkin about! Aspen, the only one that has to be relocated is the largest one (12mm sounds right). The rest of them won't be moved just yet. Perhaps when I get that turbo.....

Thanks again guys!
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