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Old 10-18-2019, 11:17 PM   #1
pandoks_
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Default Best AOS

I have a 2019 WRX Base. I want to upgrade the car hella in the future and track it. What's the best AOS I can get right now?
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Old 10-18-2019, 11:37 PM   #2
GlarryHoodDIT
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Why is it your first step is an AOS?
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Old 10-18-2019, 11:48 PM   #3
pandoks_
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Quote:
Originally Posted by GlarryHoodDIT View Post
Why is it your first step is an AOS?
Just want to do supporting mods before I go crazy on the car.
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Old 10-19-2019, 01:14 AM   #4
GlarryHoodDIT
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AOS aren't supporting mods, they're made for very specific purposes.

Are you experiencing blow-by or something to necessitate an AOS, or are you just putting random stuff on the car that doesn't require a tune?
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Old 10-19-2019, 02:04 AM   #5
pandoks_
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Quote:
Originally Posted by GlarryHoodDIT View Post
AOS aren't supporting mods, they're made for very specific purposes.

Are you experiencing blow-by or something to necessitate an AOS, or are you just putting random stuff on the car that doesn't require a tune?
I guess I'm doing that then I just enjoy working on my car and doing **** to it
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Old 10-19-2019, 02:25 AM   #6
GlarryHoodDIT
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Why don't you start with suspension/mounts/shifting improvements then? At least you'll see a benefit from those. Shift stop, short throw shift, engine/trans mounts (you'll need those if you wanna track), bushings, coil overs, etc. Lots of stuff you can do the car that'll improve performance before adding possibly unnecessary things that you don't know if you need or not.

If you're gonna track the car you'll *probably* want to do an AOS, but if that's years down the line you might as well put the money towards something you can actually use 'til then.

Just my $.02.
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Old 10-19-2019, 02:37 AM   #7
pandoks_
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Quote:
Originally Posted by GlarryHoodDIT View Post
Why don't you start with suspension/mounts/shifting improvements then? At least you'll see a benefit from those. Shift stop, short throw shift, engine/trans mounts (you'll need those if you wanna track), bushings, coil overs, etc. Lots of stuff you can do the car that'll improve performance before adding possibly unnecessary things that you don't know if you need or not.

If you're gonna track the car you'll *probably* want to do an AOS, but if that's years down the line you might as well put the money towards something you can actually use 'til then.

Just my $.02.
Thanks for the suggestions
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Old 10-19-2019, 10:26 AM   #8
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You can buy a generic catch can, hoses and fittings for way less and the only serious difference is you're going to have to empty it every once in a while (every oil change). I really didn't experience much blow by at all with my car. I'd have a few ounces in my catch can by the time I changed my oil.
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Old 10-19-2019, 02:13 PM   #9
Rexy18
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Best AOS is the one you dont buy and spend that money elsewhere.
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Old 10-19-2019, 07:50 PM   #10
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Quote:
Originally Posted by pandoks_ View Post
I have a 2019 WRX Base. I want to upgrade the car hella in the future and track it. What's the best AOS I can get right now?
To your specific request (without BS personal suggestions).. IAG and KillerB both make a very good AOS, can't go wrong with either one. Best of Luck
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Old 10-19-2019, 09:57 PM   #11
adam99
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What he said^ as far as aos. If you want the best for your car take a look at ADD W1 V3.3 catch can. What I am running now and wouldn't get anything else. Just my opinion.
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Old 10-20-2019, 03:09 AM   #12
noobultimatum
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I'm with glarry. Spend that money on other stuff for now.
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Old 10-20-2019, 08:34 AM   #13
KillerBMotorsport
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I may have a different perspective than some, but IMO an AOS is more a preventative item than a cause/effect component. If you have excessive oil in your blow-by gasses or excessive blow-by in general, you have an engine health issue. Adding an AOS at that point is masking a bigger issue.

So why do I consider it preventative? Over time the 'normal' level of oil vapors that are contained within the blow-by gasses accumulate. It starts to form small puddles where couplers meet, corners of the intercooler, intake manifold and essentially any low lying areas. Under the right conditions, the engine can ingest small amount of accumulated oil from the intake tract. Under load, this is not a good condition, although it's an intermittent process as you're not accumulating this oil at a fast rate (again, assuming a healthy or properly built engine). Another reason I consider it preventative is how it effects intercooler efficiency. Any barrier you put between the hot charge air and the internal surfaces of the intercooler core is going to effect thermal transfer of heat from charge air-to-core. This film can be very light, almost undetectable, but any amount begins to act as an insulator slowing the transfer of heat. AS this film stay on the intercooler's internal surfaces it will start to accumulate debris (since it's sticky). Over time you will start to find carbon (from blow-by) as well as any contaminants making it past the air filter. Both of these further provide a barrier to efficient transfer of heat from charge air-to-intercooler.

The FA engine is also notorious for producing build-up on the intake valves. Removing any sticky substances from the engines incoming airflow can slow this build-up down as well. Again, not a fast process, but betweeen EGR modifications and a good AOS it can slow the rate of build-up.

All that being said, this is a slow process that depends on many variables: engine age, fuel, driving style, build quality, Oil type, environment, application, power levels, etc... If you find accumulated anything in the intercooler and want to maintain best intercooler performance, then it should be cleaned out. A high quality AOS should prevent this 'normal' level of accumulation and the need to clean the intake tract to maintain best performance. Hence the 'preventative maintenance'.







As far as bang-for-the-buck, an AOS is not a performance enhancing modification per say. You don't bolt it on and notice more power. So the statements claiming there are better mods that do more for performance is completely true. The performance benefits are small and really only beneficial to those who want ideal engine conditions that they (or at least ours) can provide. Namely the benefits of pulling crankcase vacuum under boost. Crankcase vacuum under boost improves ring seal and reduced ring flutter, which can have the benefits of reduced oil consumption, and improved power potential.
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Old 10-21-2019, 08:12 AM   #14
NotMcRae
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IMHO, KillerB has nailed it (no surprise).

I'm 49 and autocross a bit in street class - and I'll admit that I'm pretty much over modding a car for the sake of modding a car. An AOS is the single engine modification that I have made (or really, that I have plans for) to my WRX .

Having previously owned an E61 535ix with direct injection and higher mileage... I've learned the lesson firsthand about carbon buildup in DI engines over time. It's unavoidable. It sucks performance. The remedy of walnut blasting is just a PITA (and not cheap, at least in the BMW world).

An AOS is a pretty easy install... if it simply gets me further down the line before carbon buildup becomes a nuisance and I need to have the intake blasted back to cleanliness or mess with the IC, I'm all in.
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Old 10-21-2019, 08:59 AM   #15
simpleJ
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If you really want to stop carbon you need meth or port injection.

It’s not just blow by but also the Atkinson combustion cycle, oil passing the valve seals, etc that causes the build up even without EGR or any blow by.

AOS is basically a requirement in EJs so that when your rings start to go and/or you corner too hard and send oil into your PCV system your engine doesn’t detonate and the oil is returned to the crank case instead of sucking itself dry and spinning a bearing.

Not so much a risk on FAs as they don’t burn oil and the head design is much better. Won’t hurt though
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