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Old 04-25-2018, 12:51 PM   #1
KillerBMotorsport
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Default Air/Oil Separation - Starting at $339

The goal of this product is simple, the removal of oil (in liquid or vapor form) from the vented crankcase gasses, easy installation, and inspection/maintenance.

This is accomplished by using a design that has no restrictions; media or baffles, to reduce the flow potential of the crankcase. Our air oil separator differs from any other on the market. We use centrifugal force to pull oil and liquid vapors out of crankcase gases. This will insure the best possible separation available. Like a tornado, our system pulls vacuum from the center of the separator with the pressured gasses from the crankcase entering an obstruction free path maintaining the most velocity. This caused the heavy vapors to fall out of suspension. It functions with a vacuum source from the turbo inlet. Drain back design assures that any oil accumulation ends up in the oil pan, providing a consistent oil supply to the engine.

Six stainless steel bolts on the top, make it quick and easy for inspection and cleaning. It is not heated, and we see no reason to add unnecessary cooling/heating (weight, complexity, increased install time, and increase probability of something leaking).

The Killer B Motorsport Air/Oil Separator should meet and exceeds your expectations of form and function. Our Air/Oil Separator is a product that enthusiasts have been waiting for.

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Last edited by KillerBMotorsport; 07-12-2021 at 04:04 PM.
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Old 08-29-2019, 12:46 PM   #2
KillerBMotorsport
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Fitment announcement. We now have 05 to 09 Legacy GT fitment For our AOS.
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Old 10-29-2019, 04:28 PM   #3
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And now SG5 and SG9 Forester fitment
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Old 03-04-2020, 02:49 PM   #4
KillerBMotorsport
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Old 03-05-2020, 12:08 PM   #5
KillerBMotorsport
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Color choices coming soon :P
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Old 03-07-2020, 10:19 PM   #6
KillerBMotorsport
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And here it is in black...

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Old 03-25-2020, 04:48 PM   #7
KillerBMotorsport
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New Pricing announced today, starting at $339
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Old 04-01-2020, 01:20 PM   #8
KillerBMotorsport
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TIG master Levi chipping away at the AOS backorder list!

Starting at $339



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Old 04-07-2020, 06:21 PM   #9
KillerBMotorsport
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I've had some questions about the temperature of the unit in regards to condensation collecting on the inside of the unit. Is there more condensation because the unit isn't heated? No.

Our AOS internal temperature is generally ~240* during daily driving conditions; blowby gasses are H-O-T. Anyone want to guess what coolant temperatures are going into a "heated" AOS?
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Old 04-09-2020, 03:24 PM   #10
2020SeriesWhiteSTi
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Lightbulb

Always thought a heated can would be better.. until you made the point about blow-by gasses. Coolant shouldn't ever be much above 215 degrees F. Definitely questioning the need for coolant to an air oil separator now...
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Old 04-09-2020, 04:29 PM   #11
KillerBMotorsport
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Quote:
Originally Posted by 2020SeriesWhiteSTi View Post
Always thought a heated can would be better.. until you made the point about blow-by gasses. Coolant shouldn't ever be much above 215 degrees F. Definitely questioning the need for coolant to an air oil separator now...
We ran other AOS units for YEARS (heated and not) before we decided to make one of our own. We tested on 3 cars for over a year each before even talking about it to the public. We learned a LOT in that time.

If a heated unit is fed off the turbo coolant line (after it goes to the turbo), the coolant will be hotter than what you see for 'normal' coolant temps, but still not as high as the hotter blow-by gasses. So if that's true... A 'heated' unit is actually cooling the AOS which is counter to alllllll the marketing out there
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Old 04-09-2020, 05:51 PM   #12
2slofouru
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COVFEFE!

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Wouldn't the coolant help keep the can at least coolant temperature during the winter, so the really cold air on the outside of the can didn't cool it enough to cause the internal condensation? Seems like at times the pcv flow would be cooled enough by the inlet air (fresh air from the turbo inlet hose) being drawn through (during higher vacuum conditions) to drop the can's temperature substantially.
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Old 04-09-2020, 07:25 PM   #13
KillerBMotorsport
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Quote:
Originally Posted by 2slofouru View Post
Wouldn't the coolant help keep the can at least coolant temperature during the winter, so the really cold air on the outside of the can didn't cool it enough to cause the internal condensation?
No. The real problem with cold temps is the drain. No AOS, heated or not, can prevent this. The factory setup even recommends these lines be pulled, inspected and replaced as needed at XXXK miles. In colder environments, under the right conditions, OEM lines are known to clog. We offer a cold weather kit that uses products made for crankcase breathing in the aviation industry, so you know it has to work

Quote:
Originally Posted by 2slofouru View Post
Seems like at times the pcv flow would be cooled enough by the inlet air (fresh air from the turbo inlet hose) being drawn through (during higher vacuum conditions) to drop the can's temperature substantially.
Yes, if you were using the factory PCV Valve. We do not. From the testing we did with different vacuum source locations, there was no upside to drawing vacuum through the intake manifold via the PCV valve. Our unit sources vacuum only through the turbo inlet. While the intake manifold does have significantly higher vacuum (low load only), but the PCV valve itself is a significant restriction, so actual crankcase vacuum is non-existent.
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Old 05-06-2020, 09:48 AM   #14
veebooster
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"We offer a cold weather kit that uses products made for crankcase breathing in the aviation industry, so you know it has to work"

What exactly is this cold weather kit? I assume an insulated drain line? Thanks
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Old 05-06-2020, 07:28 PM   #15
KillerBMotorsport
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Quote:
Originally Posted by veebooster View Post
What exactly is this cold weather kit? I assume an insulated drain line?
Correct
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Old 05-07-2020, 09:19 AM   #16
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Quote:
Originally Posted by KillerBMotorsport View Post
Correct
Thanks, I really like the simplicity of your design!
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Old 05-07-2020, 03:25 PM   #17
Jesse
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Is a tune required after install?
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Old 05-07-2020, 05:45 PM   #18
KillerBMotorsport
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Quote:
Originally Posted by veebooster View Post
Thanks, I really like the simplicity of your design!
Thank you. I'm a big fan of K.I.S.S. (Keep It Simple Stupid) and track guys generally are as well. Less things to fail.

Quote:
Originally Posted by Jesse View Post
Is a tune required after install?
No sir.

A tune should only ever be necessary if you have a Vented system. Our setup can be run that way, but it is designed to run with vacuum supplied from the turbo inlet.
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Old 05-07-2020, 06:39 PM   #19
Jesse
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Quote:
Originally Posted by KillerBMotorsport View Post
No sir.

A tune should only ever be necessary if you have a Vented system. Our setup can be run that way, but it is designed to run with vacuum supplied from the turbo inlet.
Awesome.

Another q: any fitment interference with aftermarket TMIC, such as the PW Verticooler?
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Old 05-07-2020, 09:34 PM   #20
KillerBMotorsport
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Quote:
Originally Posted by Jesse View Post
Awesome.

Another q: any fitment interference with aftermarket TMIC, such as the PW Verticooler?
I haven't tried, but with it being mounted on the strut tower, I'd be surprised if it interfered. I've run big TMICs and they've not been an issue.
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Old 07-24-2020, 02:55 AM   #21
Nickdee821
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Default 2010 wrx

I just received the AOS and was going to install it except I can't figure out where the tubes go. Please help me. Ill be back at it in 8 hours. Thank you.
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Old 07-24-2020, 07:11 AM   #22
KillerBMotorsport
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I just received the AOS and was going to install it except I can't figure out where the tubes go. Please help me. Ill be back at it in 8 hours. Thank you.
I don't know which one you've got, but they are all located on our website and have install instructions here as well

Killer B Motorsport AOS
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Old 07-24-2020, 08:16 AM   #23
murrdogg24
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Quote:
Originally Posted by KillerBMotorsport View Post
I don't know which one you've got, but they are all located on our website and have install instructions here as well

Killer B Motorsport AOS
I think he wants you guys to come over and help install....tell him to supply the pizza and beer
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Old 09-03-2020, 10:30 PM   #24
stevo9494
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Hello,

Would these fit an SH forester XT?
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Old 09-04-2020, 07:34 AM   #25
KillerBMotorsport
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Quote:
Originally Posted by stevo9494 View Post
Hello,

Would these fit an SH forester XT?
Yes they will! Same unit as 2008+ STi.
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