Oil residue in y-pipe
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This is a discussion on Oil residue in y-pipe within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hey guys ive been getting some pretty bad rev hang when up shifting (esp. at WOT). So today i decided ...

  1. #1
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    Oil residue in y-pipe

    Hey guys ive been getting some pretty bad rev hang when up shifting (esp. at WOT). So today i decided i would take it off and cleaning it to get some hand on experience and see if that would help. Got some TB cleaner from autozone, and needless to say there was a huge build up behind the butterfly valve, it worked pretty well, havent installed it yet. I figured id go ahead and remove the intercooler and clean it as well. When i took off the y-pipe i could see a streak of oil residue in the right flange going down the curve. Im concerned this may be a turbo leak. I called 2 shops 1 said the same thing after i reported the symptoms, the other (mor familiar with boosted cars) said it was normal. What do you guys think?

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  3. #2
    The Default One SeattleJeremy's Avatar
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    This is totally normal for these engines. It's oil coming from the crank case, that goes in to the intake. A catch can or air oil separator can fix this issue. GrimmSpeed - AOS

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    Moderator   Sasquatch's Avatar
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    The GS AOS has worked very well for me.
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    Gold Member lokey's Avatar
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    Quote Originally Posted by Sasquatch View Post
    The GS AOS has worked very well for me.
    +1
    Greg
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    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

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    Awesome, thanks guys. Ill definitely be getting one.

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    So cleaning the TB made a huge difference. The rmps drop much much quicker than before now, but im still getting a slight pause before they begin to drop. Any ideas? Lmk if you need more info

  8. #7
    Admiral Ackbar mycologist's Avatar
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    Are you sure that pause wasn't there before? My car always seemed to have a slight delay and I thought it may be programmed in. I kind of like when the rpm hang a tiny bit if you are driving very spiritedly but not banging gears.
    "From a little spark may burst a mighty flame." - Dante
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  9. #8
    Gold Member lokey's Avatar
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    Quote Originally Posted by Sasquatch View Post
    The GS AOS has worked very well for me.
    Hey, do you think this type of hose would be okay to use for the AOS lines? I know silicone hoses are a no-no for gas and oil, but this? I'd like to see if/when it's working.

    Amazon.com: Watts SVIG20 Pre-Cut 1/2-Inch Diameter by 3/8-Inch Clear Vinyl Tubing, 20-Foot Length: Home Improvement

    I saw this on Grimmspeed's site. -
    Attachment 102731
    Greg
    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

  10. #9
    Gold Member lokey's Avatar
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    I'll be calling GS today to see what hoses these are.
    Greg
    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

  11. #10
    Gold Member lokey's Avatar
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    Quote Originally Posted by lokey View Post
    I'll be calling GS today to see what hoses these are.

    They said the hoses are made by Gates, but I can't find them anywhere! Ugh. Is it really that hard to find 1/2" and 3/4" clear hose that is suitable for fuel/oil use?
    Greg
    Build Thread
    ProTuned Stage 3ish '11 WRX Ltd HB (SWP) ~ 354 awhp 404 ft-lb tq on E85
    Friends don't let friends drive Mitsubishis.

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