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Old 12-27-2016, 05:49 AM   #1
jayfoe
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Default Catch Can/AOS Recommendations

Thinking about getting a catch can/aos but not sure which to get. I hear a lot about iag aos but it's kind of expensive compared to a catch can. I have no problem getting iag if it's really worth the price but I need more info.

Any info is appreciated.
Thanks.

Edit: I daily my car with some spirited driving. Never track and don't really plan on it at this time. Currently stage 1 with accessport, intake, and catback exhaust. Planning on going stage 2 with a downpipe
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Old 12-27-2016, 08:31 AM   #2
simpleJ
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Don't buy one and save your cash.


If your motor is loose enough to require an aos then you have a bigger problem than blow by, or you have forged pistons.
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Old 12-27-2016, 10:31 AM   #3
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Originally Posted by simpleJ View Post
Don't buy one and save your cash.


If your motor is loose enough to require an aos then you have a bigger problem than blow by, or you have forged pistons.
^This is a dumb suggestion.
You engine doesn't need to be **** to be experiencing blow by. Any modded engine will benefit from an AOS. Compared to a catch can its a no brainer. They both serve the same purpose but one requires you to drain it and the other doesn't.

Look into the Crawford performance one. It was an easy install for me after looking at a routing diagram and it works well. The price point is lower then the IAG and does the exact same thing as well and has been around longer with a proven reliability record. Do yourself a favor though and replace all the zip tie connections with worm gear clamps.
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Old 12-27-2016, 10:56 AM   #4
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if you're making a good bit more power than stock and you drive it hard for long periods of time I'd get the IAG AOS. a catch can would be fine if you don't drive it hard for long periods of time (track use). you didn't say what you use the car for or what your current mods are. the IAG AOS uses coolant to warm itself (it won't be clogged with sludge after the winter), so does the Perrin one but only the base, and none of the others are worth the price. any catch can will do if you go that route, as long as its baffled, they are pretty much all the same.

i haven't bought either yet because I don't track the car and am only stage 1 + TIC BCB beta bundle. the longest abuse my car sees is 5-10 autocross runs maybe a few times a month. i'll take my chance with blow by since i've never lost a noticeable amount of oil between changes
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Old 12-27-2016, 01:02 PM   #5
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Originally Posted by dev6565 View Post
^This is a dumb suggestion.
You engine doesn't need to be **** to be experiencing blow by. Any modded engine will benefit from an AOS. Compared to a catch can its a no brainer. They both serve the same purpose but one requires you to drain it and the other doesn't.
Lol, okay.

So what is the benefit of an AOS exactly?

Are you hoping to prevent knock? Oil vapor in your intake tract is going have a minor influence on knock. If the car is teetering on the ragged edge of timing and boost where minuscule amounts of oil vapor is causing knock... then the oil vapor is the least of your concerns.

Are you losing a measurable amount of oil to blow by every change? You might have a worn in piston ring or cracked ringland or other problem. An aos/catch can is a bandaid.

Do you want to keep your valves clean? Tough luck, these don't help keep your valves clean. It's the egr's fault. On top of that, unless you're running wmi chances are you're gonna need to walnut blast at some point anyways. The cost of an aos is better spent on your first walnut blasting.

Use the thing between your ears. Catch cans are also a waste for reasons above.
Otherwise just what an AOS is doing is: catch all the junk the crank case is venting from its oil and put it back in rather then send it through the combustion cycle and get rid of it.

If you have forged pistons or are pushing an exceptional amount on your big turbo car, please run one. Standard "stage 1/2/3 bro" set ups and it is a total waste. Don't get upsold on crap you don't need.

Last edited by simpleJ; 12-27-2016 at 01:12 PM.
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Old 12-27-2016, 01:23 PM   #6
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OK so I'm a dumbass for having a differing opinion from you and can't use my brain. Good way to convince someone that your right *******.

Anyways, at least you did mention all the benefits of an aos but then just proceeded to say who cares about each one. So you don't care about these things but obviously this guy does. An AOS is a solution to the oil in intake tract, reduction in octane level that can cause detonation, losing oil that's being burned in the cylinder, ect. If you're not sold on it being worth it OK but these things are proven to work. He asked for suggestions for which to buy not a computer chair engineer to give them a theory on why those benefits an AOS shouldn't matter. If you want to buy one do so, the Crawford and IAG are basically the same and do the same thing. The Crawford one has been around longer and is cheaper. Better deal overall. Discussion pretty much over.
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Old 12-27-2016, 01:35 PM   #7
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The marketing kool aid is strong, I see

Yea it's not gonna hurt anything, but if any of the issues it "helps" are bad enough to cause actual problems, it's just a band aid. And if you're gonna do it vent to atmosphere or get a catch can and get that crap out of the motor.

Cost not justified. Save your cash.

Last edited by simpleJ; 12-27-2016 at 01:42 PM.
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Old 12-27-2016, 01:48 PM   #8
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if you do a search on the forum there are plenty of suggestions. The 2 go to seem to be IAG and Crawford, that being said I have a Crawford as it was cheaper and based on most comparison and data posted they are very equal, both being quality
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Old 12-27-2016, 02:37 PM   #9
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Quote:
Originally Posted by dev6565 View Post
^This is a dumb suggestion.
You engine doesn't need to be **** to be experiencing blow by. Any modded engine will benefit from an AOS. Compared to a catch can its a no brainer. They both serve the same purpose but one requires you to drain it and the other doesn't.

Look into the Crawford performance one. It was an easy install for me after looking at a routing diagram and it works well. The price point is lower then the IAG and does the exact same thing as well and has been around longer with a proven reliability record. Do yourself a favor though and replace all the zip tie connections with worm gear clamps.
crawford is horrible. get the IAG. check out this thread regrading the crawford unit. http://forums.nasioc.com/forums/show....php?t=1864620
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Old 12-27-2016, 02:43 PM   #10
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Originally Posted by bmxhotsauce View Post
crawford is horrible. get the IAG. check out this thread regrading the crawford unit. http://forums.nasioc.com/forums/show....php?t=1864620
1. All aos will experience the gunk in some form/volume or another. It's just the nature of the beast and condensation.

2. That was for a Crawford v1 AOS for an EJ car from 7 years ago. The problem was remedied on the V2 aos. That thread is not applicable.
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Old 12-27-2016, 03:18 PM   #11
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I purchased a mishimoto catch can system, i have EGR deletes already. I purchased it for the sole purpose of peace and mind. I don't want any oil vapor in my intake tract, nor ever have to think about vapor induced knock. Did I really need it? NO but feel better its there. I do check the can every week though. If you don't already have the EGR delete id spend my time and money on that and an E-tune.
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Old 12-27-2016, 05:21 PM   #12
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Thanks for all input. I wasn't expecting so much that fast but glad a lot of people responded. I left out some details and I'll edit my original post with the same info.

I daily my car with some spirited driving. Never track and don't really plan on it at this time. Currently stage 1 with accessport, intake, and catback exhaust. Planning on going stage 2 with a downpipe soon.
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Old 12-27-2016, 05:24 PM   #13
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Originally Posted by simpleJ View Post
1. All aos will experience the gunk in some form/volume or another. It's just the nature of the beast and condensation.

2. That was for a Crawford v1 AOS for an EJ car from 7 years ago. The problem was remedied on the V2 aos. That thread is not applicable.
still happened on mine with the V2 as will with JR tuned personal car last year.. we had the same issue as well many other with the V2 . went the IAG street and the problem never came back. check all the reviews .
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Old 12-27-2016, 05:52 PM   #14
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Originally Posted by dev6565 View Post
You engine doesn't need to be **** to be experiencing blow by. Any modded engine will benefit from an AOS. Compared to a catch can its a no brainer. They both serve the same purpose but one requires you to drain it and the other doesn't.
+1 For this! We should have one for the new cars here in a few months
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Old 12-27-2016, 06:48 PM   #15
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Default Catch Can/AOS Recommendations

People will give you their opinion all day long. Some will be positive and some will be negative. I've tried two different setups and both have worked great for me. I started with a Grimmspeed AOS and now I'm running a Beatrush AOS system.

Some people will tell you XYZ brand is ***** because they said so based on YouTube videos or what others have said so without actually using the product, or considering the totality of all the circumstances.

Such things to include the weather/climate you drive around in, driving styles, HP levels, or if the car is tracked.

Do your own research and come to the conclusion of which brand/setup will benefit your car the most.
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Old 12-28-2016, 09:11 AM   #16
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Cost not justified. Save your cash.
Not to you, but to many others it is.

And to throw another towel into the ring, we just released ours...








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Old 12-28-2016, 11:40 AM   #17
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Here are the questions you need to ask:

1) Do I want to maintain (or mind maintaining) the part -- i.e. check the device, drain if necessary? If yes, get a catch can; it'll cost less and performs the functions that you want it to perform. Any catch can will do because their operational function is super simple. If no, get an AOS and here, there are a number of options.

2) If you're going with AOS, what are your priorities? What's important to you? a) Build quality, and/or b) cost? The two are interrelated. The better the build, the more expensive they tend to be. Of the AOS to consider, they only ones you should consider have been mentioned:

a) Crawford, version 2, roughly $385
b) IAG AOS Street, roughly $400 (competition version is cheaper, but will require a tune)

Avoid the Perrin AOS due to build and cheap fittings. You can find many posts of people who've started with Perrin only to find their intake tract gummed up with nastiness. Those will have switched to something like an IAG with better results.

If money is not an issue, I would definitely look into the beautiful piece of hardware mentioned above, by Killer B. I mean look at those welds. Note though, their AOS doesn't tap into the coolant and doesn't heat the apparatus. Although they've said they've found it to be unnecessary.

I personally run a Radium Engineering AOS, which has an added benefit of a dipstick. It's also beautifully engineered, and looks just as good in the engine bay as the Killer B. Hope this helps you make a decision. I was in the same boat myself and was about to get an IAG (local), but got the RE for cheaper.

P.S. I also agree with a few sentiments above about the actual NEED for an AOS on the FA platform. Since you're not doing anything crazy, it might not actually be necessary. That said, be mindful that your valves are still going to get dirty; you're still going to get carbon deposition, intrinsically because it's a direct injection motor. An AOS isn't going to help that. Particularly since you're not pushing your car, your type of driving will likely result in more deposition. The scenario for deposition potential happens mostly during idling and low speeds. It's why the encouragement on DI motors is to run it hard once in a while, WOT. The opposite is true for MPFI motors, like the EJ.
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Old 12-28-2016, 01:53 PM   #18
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yes the IAG competition version is cheaper but you'll get a burning oil smell and different vacuum numbers, plus its basically a road draft tube... probably not legal. it looks like the killer b unit has the largest volume, which IMO is just about the only advantage it has, so that is probably the option for a pure track car which sees no winter/cold driving versus all the other designs with coolant flow (IAG, Crawford V2, Perrin) which are appropriate for all conditions. but who has a track only 2015+ WRX anyway?

like the EGR delete an AOS can create a vacuum leak or coolant leak if you do it wrong so consider that. also when it comes to cheap fittings leaking, mishimoto...

personally I would like to say ****it and buy the killer B ewg turbo kit, IAG competition AOS, and spit flames. but like many others this car needs to be street legal. so the best thing to do is to leave it alone when it comes to some of these mods
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Old 12-28-2016, 02:09 PM   #19
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Thanks again for all the info guys. I wasn't really thinking about EGR delete but glad thats on my radar now too. Trying to find that happy balance between fun/power mods and overall car longevity mods with my budget hahaha I'm leaning towards iag aos street from the sounds of everything and cuz someone here is selling one right now for a good price. I'd much rather just set and forget so i don't have to worry about it.

With egr deletes you need a tune right? That might have to wait for now.
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Old 12-28-2016, 02:41 PM   #20
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Make sure you get a full understanding of EGR and it's impact on the engine's function before you yank that off, too.
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Old 12-28-2016, 04:57 PM   #21
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Quote:
Originally Posted by _brian_ View Post
it looks like the killer b unit has the largest volume, which IMO is just about the only advantage it has, so that is probably the option for a pure track car which sees no winter/cold driving versus all the other designs with coolant flow (IAG, Crawford V2, Perrin) which are appropriate for all conditions.
That's debatable and volume has more of an influence when you're using a different or baffled design. Plays much less of a role with a design like ours.

The shop cars that have been testing this product for over a year now are all daily driven. Every unit is functioning better than the aftermarket units they replaced. Some of these cars have gone from OEM power levels to aftermarket turbo kit/built engine power levels. The intent of this product was to work better under more conditions, not less

As far as cold weather accumulation, it depends on many factors. If you don't ever want to pop the top off our unit and inspect and/or clean (takes <10 minutes, if it's even needed) at every oil change, then our unit is not for you. I perform this task while waiting for the oil to drain. Of the three units and many oil changes I've done it (cleaned) once. Not because it was necessary as the accumulation was minimal, but to see how long/difficult it would be. Of course we do reside in VA, so we don't see single digit or lower temps for more than a few days at a time during the winter months. My commute to work is ~6 miles which is ideal for goo accumulation due to the engine not reaching full operating temperature. Just my 2 cents from living with these units. I'm sure others will have different experience under their own conditions, but my point was more to the easy and minimal maintenance.

Personally I think catch cans have a tremendous potential for oil starvation when driven at 'performance. levels. The 'can' can fill under severe cornering. This can and has reduced the oil level in the sump enough to cause oil starvation. Some designs can increase PCV pressure (which is bad) due to poor baffle design or the use of media.
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Old 12-28-2016, 10:23 PM   #22
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Quote:
Originally Posted by KillerBMotorsport View Post
Personally I think catch cans have a tremendous potential for oil starvation when driven at 'performance. levels. The 'can' can fill under severe cornering. This can and has reduced the oil level in the sump enough to cause oil starvation. Some designs can increase PCV pressure (which is bad) due to poor baffle design or the use of media.
No one seems to think about this but its yet another reason why I would never consider a catch can system in my car or recommend it to anyone else. To me it just seems that the design is outdated and an AOS is all around a better solution. Also, although I have an 06 WRX and am very happy with my Crawford unit, I'm curious what the price is going to be for your new AOS?

Sooperwrx12 +1 for mentioning the Radium Engineering unit, I didn't even know it existed and took a few minutes to look into it. It looks like a very high quality unit but it seems like the price point just isn't there to make it competitive.
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Old 12-28-2016, 11:31 PM   #23
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Originally Posted by bmxhotsauce View Post
crawford is horrible. get the IAG. check out this thread regrading the crawford unit. http://forums.nasioc.com/forums/show....php?t=1864620
Are you aware that is not even the same version as what they have made for the 2015 application. Do you have first hand experience? I suggest checking out some who are owning it
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Old 12-29-2016, 01:59 AM   #24
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Are you aware that is not even the same version as what they have made for the 2015 application. Do you have first hand experience? I suggest checking out some who are owning it

Guess you were not made aware I stated I ran the V2 with there coolant lines as well as Jr tuned as well many other with the same issue.. please read before you post. Thank you
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Old 12-29-2016, 04:01 AM   #25
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I have also had issues with AOS's returning milky yellow gunk into the sump. After that I gave up on them.

I have been running a catch can on my ej207 for 5+ years including many track days and never even 1/4 filled it. Many high g corners. All serious track cars I know of run catch cans.

I then fitted the mishimoto dual catch cans on my fa20. They have not caught a drop of oil in almost 20k miles. Im running stage 1 and like to give it a hard time but never seen the track.
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