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Thread: OBD2 Catch Can question

  1. #1
    Join Date
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    |99 Turbo M3 | 2K7 335|

    OBD2 Catch Can question

    I have a question related to Catch Can / CCV.. I bought a BMS catch can, and not sure where to connect it properly..

    It's a TT Stage 2 setup, so, my undestanding is:

    Crankcase vent to CC IN
    CC out to Pre-Turbo

    Plug tube that was going to crankcase vent
    Plug tube to dipstick, and plug the dipstick drain

    am I right ?
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  2. #2
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    Does that one not have a drainback provision that you can drain to the dipstick tube? Or it does but you don't want to use it?

  3. #3
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    Quote Originally Posted by tptrsn View Post
    Does that one not have a drainback provision that you can drain to the dipstick tube? Or it does but you don't want to use it?

    no drain on the catch can,, you empty it every months or so..
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  4. #4
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    Ok, thanks. I made mine with a drainback. Emptying a catch can doesn't sound like something I want to do, but to each his own!

  5. #5
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    Quote Originally Posted by tptrsn View Post
    Ok, thanks. I made mine with a drainback. Emptying a catch can doesn't sound like something I want to do, but to each his own!
    Great idea. Right now I'm just wondering if I connected everything correctly.. for the drain you just connected a hose from the bottom of the CC to the dipstick drain ?

    Envoyé de mon SM-G930W8 en utilisant Tapatalk
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  6. #6
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    With the grit in a catch can you might consider draining it not into your oil pan.


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  7. #7
    Join Date
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    '97 540i/6, '97 328i
    Yep, that's what I did. Some people don't want that crud going back into the crankcase. Personal preference.

    - - - Updated - - -

    Quote Originally Posted by vollosso View Post
    With the grit in a catch can you might consider draining it not into your oil pan.
    And right on cue! Lol

  8. #8
    Join Date
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    Renton, Wa
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    Haha, just food for though.

    I used to run one and was very surprised..


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

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