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Guide - How to fit a catch can and simplify the PCV system

Westy Apr 20, 2011

  1. Gonzokew

    Gonzokew Active Member

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    1. Received my catch can today so decided to fit that. Took out fuse box and boost sensor that was inside it and moved into trunking underneath airbox. Then fitted catch can in its place. Not a lot of room to work with, not 100% happy but it's in and I had enough by the end of it for today...

      [​IMG]

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      #179345 minutes ago
     
    fanta, scotty_24 and Actua like this.
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  3. fanta

    fanta Active Member

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    Anyone done this with braided AN pipes? I've been hunting for a guide and cant find one.

    Sent from my XT1572 using Tapatalk
     
  4. Amex

    Amex New Member

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    Has anyone routed crank breather into valve cover and valve cover to catch can. Looks much better like that instead seperate pipes.

    Sent from my HUAWEI VNS-L21 using Tapatalk
     
    fanta likes this.
  5. IanPG

    IanPG Well-Known Member Silver Supporter Team Nogaro Blue Audi S3

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  6. rushton

    rushton New Member

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    What one-way valves are people using to keep servo pressure when the factory one is removed?
     
  7. IanPG

    IanPG Well-Known Member Silver Supporter Team Nogaro Blue Audi S3

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    there is already a check valve just before the servo. behind the heat shield that the DP is in front of - it's wrapped in heat cloth - so no need to worry about extra check valves
     
  8. rushton

    rushton New Member

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    Ill just replace with a aftermarker silcone hose then, heard various opinions on if it was needed or not. Perhaps it varies between application S3/golf/cupra etc.
     
  9. marnob

    marnob New Member

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    I have just removed all the hoses and PCV as they were all cracked and leaking. Car has been running like **** for a while. Replaced O2 sensor pre cat & MAF sensor. Helped a bit but Idle is up and all over the place.
    Not sure about putting a valve in, but after deleting the PCV and hoses my brakes are shocking and change from good pedal to rock hard and hardly any
    brakes!?
    I guess I am going to have to put a valve in like the others have although its been said the S3 doesn't need it?
    Not sure whats going on?
    Also, has anyone actually checked the Hockey Puk thing out? I have and its is totally see through?
    Just looks like it will collect a bit of gunk but apart from that it just seems to be a point for hoses
    to meet? No one way valve or anything like that.
     
    Last edited: Oct 1, 2016
  10. Erikn89nl

    Erikn89nl Well-Known Member

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    Brake servo hoses cracked? Checkvalve fitted the wrong way around?
     
  11. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Just spent the last 7 hours reading every single post on here about deleting the pcv. First of it's a great guide, nicely laid out and worded, really made me want to go ahead and get on with it. So I've searched for all the stuff on the "bay" and ready to check out, Going for catch can and vent to atmos. Then I carry on reading and it's starting to sound not as apealling, with not having negative pressure in the crankcase when on boost, and making the crankcase work harder to get rid of the gunk. Now I'm really ducking confused about having another t'd of section running from the throttle body with an extra check valve to control the pressure. What I want to know is, is it actually worth doing? and does the original (more simple) way of doing it actually work? My gut instinct tells me to go with the tried and tested way but I don't want anything smoking
     
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  13. Stuart B

    Stuart B Well-Known Member

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    I have the simple version
    blocked throttle body
    19mm pipe from oil filter and cam cover
    Catch can connected to puc and tip

    I don't really get any oil in the catch can but I needed to modify it to add a baffle to collect it.

    Not sure about the worth it question.
    It reduces oil contamination in the air fuel mixture, but I did it to get rid of the split hoses.
     
  14. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    But if your venting back into the TIP your still putting the vapour back into the intake and still getting contamination so is it worth doing? You'd have to vent to atmos to stop the contamination, but then, from what I've read, you're not getting the negative pressure in the crankcase.
    Yes that is originally why I started to read up on it, I seem to have symptoms of split hoses.
     
  15. Solberg

    Solberg Active Member

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  16. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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  17. Solberg

    Solberg Active Member

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    IE products are priced insane...but I have to admit I have a little fetish for their products :sweatsmile::sweatsmile:
     
  18. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    By reading up on PCV systems on wiki, the ever so reliable source, you do seem to need some negative pressure to suck the gunk out. Random fact, PCV systems were invented for tanks during world war 2 so the crankcase could breathe without water getting in. Looks like I'll be venting to TIP, hopefully santa will bring me a badger5 v2
     
  19. Stuart B

    Stuart B Well-Known Member

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    When I tried to vent to atmosphere the filter split in half and fell off, the baffle / wire wool is supposed to separate the oil from the vapour. As I said the main reason I did this was to replace the spilt hoses.
     
  20. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Yea I'm going to give it a go and vent back in to the tip, going to stuff plenty of baffle in. Thanks for sharing your experiences, I shall try and learn from them. As my AMK is on roughly 135000miles would I benefit from cleaning out the SMICs and throttle body?
     
  21. Stuart B

    Stuart B Well-Known Member

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    I still have the smic's but if you are going to the effort of removing them to clean then why not replace with a FMIC.
    If you clean the throttle body you need to use VCDS to recalibrate it.
     
  22. Dr. mechanic

    Dr. mechanic Member

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    epic fail
     

    Attached Files:

  23. Dr. mechanic

    Dr. mechanic Member

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    corrected
     

    Attached Files:

  24. Solberg

    Solberg Active Member

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    Anyone who have had a free air vented catch can with bad experiences?

    I am buying the Integrated Engineering vented can I linked above over the new year.
     
  25. IanPG

    IanPG Well-Known Member Silver Supporter Team Nogaro Blue Audi S3

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    I have the exact one - i think just as long as you keep it empty you will be fine

    i find that after a while it starts spitting out the top hahaha
     
  26. Stuart B

    Stuart B Well-Known Member

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    This is the simple setup I have, why is it an "epic fail" ?
    Seems fine to me over the last 12 months. And you haven't really provided the 1.8t solution in your illustrations either have you, just that it needs two catch cans.
     
  27. Erikn89nl

    Erikn89nl Well-Known Member

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    Except now your oily **** is still getting sucked in through the entire intake system, from TIP to manifold, and it still affects your fuel mixture octane under boost...

    @Prawn has set his PCV up in such a way that it always gets sucked through the catch can, by copying and improving the original design.
     
  28. Dr. mechanic

    Dr. mechanic Member

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    with my setup there is no OIL, only the blowby and minor oil gas will goes to engine,
    vented PVC is for race use or big hack of boost like 30 psi and so....
    you engine design to have slight vacuum in the crank case by venting the blowby out the ecu (as the maf sensor
    read that air ahead entry to engine) will inject more fuel....
    final world you going to decrease your engine et life ( as those oil gases help lub the rings) and increase fuel consumption....

    there is no actual vent from crank case by removing the PCV valve, the vacuum is the actual drive force for
    venting the crank case. only the blowby with the rhythmic pulsing can leave crank case.

    #basic
     
  29. Dr. mechanic

    Dr. mechanic Member

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    this my no 4th setup and works like dream.
     

    Attached Files:

  30. Dr. mechanic

    Dr. mechanic Member

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    ps. if you living in humaded weathers eg. uk the open PCV aka vented is big no.
     
  31. Stuart B

    Stuart B Well-Known Member

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    I assume you are referring to the weather causing too much emulsification in the early mornings blocking the atmosphere filters?
     
  32. Dr. mechanic

    Dr. mechanic Member

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    not only in mornings, any time you start a clod engine, in open PCV the moisture can easily pass your small vent filter into your PCV and make a very nice creampie aka emulsified.
    this pic was my ex-setup with clear hose to see what going on inside of them ;)
     

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  34. sparkysi90

    sparkysi90 New Member

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    Hi I found this online and wanted to know what people think... http://forums.vwvortex.com/showthread.php?t=6077892
    I have my catch can connected as to this thread from oil filter housing to crank case to catch can then the atmosphere, is this a better way of doing it? Thanks
     
  35. IanPG

    IanPG Well-Known Member Silver Supporter Team Nogaro Blue Audi S3

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    Isn't the purpose of the catch can to trap this cream pie sludge???

    Every time I have emptied mine out, sludge and water come out.

    I've now joined it all back up to return to TIP due to idle not being smooth. Need to empty it out to see if return to TIP gives the same sludge/water or not.
     
  36. Dr. mechanic

    Dr. mechanic Member

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    alright today I had to modifying bracket of my oil catch can for fitting S3 strut bar,
    I empty the can, since I dont own a decent camera I recorded it with iphone.
    over all I am satisfied with my setup, however I will made some changes since I have 2ndry
    separator for under boost which unnecessary ;d






    IMG_4234.JPG IMG_4235.JPG IMG_4236.JPG IMG_4237.JPG IMG_4241.JPG IMG_4242.JPG IMG_4243.JPG IMG_4244.JPG IMG_4245.JPG IMG_4246.JPG
     
  37. Stuart B

    Stuart B Well-Known Member

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    I emptied mine out and it was only yellow sludge and water - no oil.
     
  38. hydro s3

    hydro s3 S3 amk Team Ming Blue Audi S3

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    20170810_110509.jpg How often do you need to emty them. When mine was fitted i did away with the hockey puck and just ran it straight threw to the catch can and vented to atmosphere and blocked of the hole on the tip.
     
  39. Stuart B

    Stuart B Well-Known Member

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    I have emptied mine once, but I don't have a top or bottom to remove, I undo the see through level bits and stick the pipe back into it to start the gloop coming out.

    pretty sure my engines on its last legs in any case - road tax on the 1st of November then some mapping fun then sell as a project to someone else to carry the torch onwards.

    I did try to vent to atmos but the filter just got wet and blocked and shot off the can.
     
  40. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I fitted my catch can a week ago. One pipe from the oil filter housing, joining a pipe from the crank case breather with a t piece, to the catch can, vent back into the TIP. I did this because I had a PCV leak. I emptied it today. It was only half full but it was full of water and a tiny bit of sludge. Is this normal. I’ve also noticed a stronger smell of petrol.
    D9D4BBCB-9F8A-4CF8-BB75-E9C9CFBACCCA.jpeg
     
    Last edited: Nov 18, 2017
  41. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    Sorry for the late reply and I don’t know if you’ve found your answer yet, but going on my experience this last week, in this cold weather I would empty it once a week.
     
  42. Siondc

    Siondc Learner!! Ming Blue S3 AMK

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    I’ve noticed after fitting my catch can blue smoke coming out of my exhaust. I’ve also noticed oil around my oil filler cap after I’ve driven the car quite hard. Have I ****ed my car?
     
  43. Erikn89nl

    Erikn89nl Well-Known Member

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    That depends, how did you fit it exactly?
     

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