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Old 11-20-2014, 06:05 PM   #1
user1029
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Member Sales Rating: (6)
 
Member#: 57064
Join Date: Mar 2004
Vehicle:
2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default IAG AOS Review

Original post: http://www.iwsti.com/forums/2-5-lite...ml#post4046716

I just want to say that me championing IAG products is having experienced first-hand the praiseworthy attention detail they put into their work and their relentless drive for perfection. I’m a staunch supporter for great Subaru shops to be recognized because I’m tired of seeing customers’ hard earned money wasted due incompetent work compounded by subpar customer service!

Firstly, everyone knows the benefits of an AOS/catch can but here are certain attributes they absolutely need to have:
1. 3 ports (one for each cylinder head and one for top of block). Reasoning being this allows for much efficient relief of crankcase pressure.

2.Coolant heated especially in colder climates or else this happens.


There are certainly products out there have do fulfill the above criteria, but as I will go into, there are features of the IAG AOS that perches it atop the food chain. I mean why else would IAG bother even releasing an AOS with a market already inundated with AOS/catch cans?

The rather unassuming, plebian exterior of the IAG AOS belies the engineered intricacies of its internal guts:

1. Better oil separation than its competitors. This is the main idiosyncrasy of IAG’s design. Through painstaking testing and poring over the breathing characteristics of the EJ25, this is what they come up with.
  • No vacuum source allowing for slower movement of oil vapors through the can for greater separation.
  • Swirl pot design for slowing internal velocity.
  • Huge breather port to slow the vapors even more inside the can.
  • The superior coolant heated design ensures that the entire can is perfused by heat so condensation won't form in the oil you separate...which is important because you want the oil to be as pristine as possible going back into the engine!

2. The large capacity, up to 1L (Crawford holds 750mL), practically negates the possibility of having the AOS be brimming full of oil during hardcore tracking. Size comparison:


3. Larger drainage port than its competitors so the AOS can empty the separated oil more efficiently back into the crankcase.

4. The ports are machined into the actual AOS, unlike Perrin which relies on Teflon tape for a seal which is known to break down. READ: Oil + hot engine = FIRE not to mention blatant oil loss (Perrin Air Oil Seperator Install/Review - Page 3 - NASIOC), more leaks: Leaking perrin AOS - NASIOC
more leaks: http://www.iwsti.com/forums/4079430-post38.html
More leaks: http://www.iwsti.com/forums/4079908-post40.html
more leaks: http://forums.nasioc.com/forums/show...7&postcount=69

Furthermore Perrin AOS O-rings needs to be inspected (http://www.rallysportdirect.com/cata..._eng_606rd.pdf) whereas IAG uses Viton O-rings that not only withstand the harsh temperatures of the oil but also the potentially corrosive properties of oil (high chemical resistance).


5. Although maintenance-free, it is easily disassembled like Perrin for cleaning.

6. Just overall a high quality design, your $370 goes a long way!


7. AOS is better than a catch can. I’ve ran a Peterson catch can for 75,000 miles. Although I was desensitized to the smell, my passengers would comment on the smell of oil. The vapors would come out of the breather filter to condense to an oily film on my surrounding components, aside from looking like sheer filth it could also pose as a fire hazard. There is also the possibility of an oil catch can filling up entirely during hardcore cornering on the track, depriving the motor of all that sequestered oil.

8. IAG AOS will fit even with upgraded TMICs.

9. Why no vacuum source? The main reason is that the engine is under a positive pressure when you are boosting and a vacuum source is not really need while cruising. It also eliminates ANY possibility of any oil getting back into the intake system. The PCV system is really for emissions where it is not emission friendly to dump the vented gases into the atmosphere so they are rerouted back into the intake. As people who modified cars, we don't really care about emissions with our catless downpipe, do we The IAG AOS is built upon the lack of a vacuum source and it does its job extremely well :tup:

The new IAG AOS V2 will feature an optional vacuum source for those who adamantly want it

10. IAG has the best coolant passage design to ensure that the ENTIRE CAN is perfused uniformly by warm coolant. This of course lessens the possiblity of sludge build up and prevents condensation formation. Perrin only has the base heated.




Personally, this is what my throttle body looks like with 30psi of boost and 3000miles with the IAG AOS (dat pink meth). No smell of oil at all :tup:


so stealthy that the dealership will think it is the 2015 STi sound tube


Further endorsement from Junior NASIOC - View Single Post - PTE6466 650+WHP Build E85
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Last edited by user1029; 02-05-2015 at 11:36 PM.
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Old 12-20-2014, 11:07 AM   #2
dstroy
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Join Date: May 2011
Chapter/Region: NESIC
Location: Newport
Vehicle:
2012 STI sedan
Black with scratches

Default

I've had mine for a couple of weeks now.



The mounting options/hardware with the kit will fit all of the typical install areas, but I didn't have space by my turbo on the strut tower (ETS turbo kit). So I just made a bracket and it bolted up nicely right above the CCV.



I'm extremely happy with the operation of this AOS, it's much better than the Crawford I had before. It's fit/finish are excellent, it was packed with care and the instructions on IAG's website are great.

The only things I wish were different are:

The vent hose for the competition can kinks easily.

The large diameter emissions hose for the CCV, I wish it was more flexible/had a smaller bend radius, I'm going to be getting some 90* PVC fittings from my hardware store to get rid of the extra hose on my install.

And, the coolant connection barbs. Please just use regular worm clamps instead of oetiker clamps, and don't cut the heater hose/or include more heater hose with the kit.
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Old 12-30-2014, 05:57 PM   #3
Gatehous3
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^ oh man, there is a lot in your engine bay haha.

I just received this in the mail, but haven't gotten a chance to install it yet. This thing is quality. I waited almost 2 months to get mine after pre-ordering, but im glad I chose this over the crawford.

Everything in the kit is quality, and it comes with mounting hardware for 04-07 and 08-14 STi's.

I got this kit, because ive been running with a built motor that has large piston to wall clearances for a while now. Im getting crazy amounts of oil in my intake track and its worrying me. Hopefully this will take care of that issue
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Old 12-30-2014, 07:08 PM   #4
SnakeEyez
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Wow thanks a bunch for this review, I was looking at the perrin but im totally gonna hop on IAG's website and order one of these up.
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Old 12-31-2014, 02:31 AM   #5
user1029
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Member Sales Rating: (6)
 
Member#: 57064
Join Date: Mar 2004
Vehicle:
2008 STi IAG built
HTA86, Meth, 272s, Cos IM

Default

My job here is done
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Old 01-27-2015, 10:37 AM   #6
driftit89
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Default IAG AOS review

Question: by not using the oem pcv vacuum system, the IAG AOS works only by positive pressure of the crankcase while under boost? So what about blowby in the crankcase and head breather while cruising (system in vacuum, no boost)?
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Old 01-30-2015, 11:08 AM   #7
IWD
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Location: SoCal
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2013 WRX
plasma blue pearl

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Quote:
Originally Posted by driftit89 View Post
Question: by not using the oem pcv vacuum system, the IAG AOS works only by positive pressure of the crankcase while under boost? So what about blowby in the crankcase and head breather while cruising (system in vacuum, no boost)?
Vacuum is for emissions. The breather will still vent the blowby naturally.
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Old 01-30-2015, 02:18 PM   #8
IAG Performance
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Chapter/Region: MAIC
Location: www.iagperformance.com
Default

Quote:
Originally Posted by driftit89 View Post
Question: by not using the oem pcv vacuum system, the IAG AOS works only by positive pressure of the crankcase while under boost? So what about blowby in the crankcase and head breather while cruising (system in vacuum, no boost)?
Actually, our Street Series (which I still don't recommend) does retain the PVC and pulls a vacuum on the system. Contrary to what you may here, we have tested this and found it to actually LOSE power compared to our Comp Series which vents to atmosphere. If you have any specific questions shoot us an email or call and speak to a tech.

Regards,

JJ
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