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Old 06-12-2010, 02:07 PM   #1
sense of nature
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Angry Anyone using a G.S AOS w/ a built motor & larger Turbo?

Just wondering if others have done this ... I have & would like to discuss some issues that have occurred
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Old 06-12-2010, 02:12 PM   #2
fourseasonsandles
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I dont have a built block, but was running an ATP3076 w/TGVs, APS DR525, and meth with the Grimmspeed A/O Separator. Unfortunately I just lost Cyl 4 and looking to do an engine build.

Curious what issues you have.

Last edited by fourseasonsandles; 06-12-2010 at 02:18 PM.
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Old 06-12-2010, 02:14 PM   #3
sense of nature
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I had lots of oil that pooled on the top of the cap , blew smoke on decel ( bad valve seal ) Which I think was caused by the AOS since the heads were completely refreshed ..new seals valves springs & retainers
I sent them an e mail w the picture of the oil on the cap over 2 weeks ago & have yet to get a reply .
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Old 06-12-2010, 02:17 PM   #4
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I just did a compression test on my car yesterday and that's how I know something is up with my Cyl 4. I had oil spraying out of the top of my A/O separator on the underside of the hood and drivers side. Also had oil pool on the top section of the separator.

My car is just parked for the time being until I figure out what to do with it. I dont know if the oil was coming from the breather lines or from the oil filler neck, but that top O-ring doesnt seal ****.
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Old 06-12-2010, 03:21 PM   #5
sense of nature
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Quote:
Originally Posted by fourseasonsandles View Post
I just did a compression test on my car yesterday and that's how I know something is up with my Cyl 4. I had oil spraying out of the top of my A/O separator on the underside of the hood and drivers side. Also had oil pool on the top section of the separator.

My car is just parked for the time being until I figure out what to do with it. I dont know if the oil was coming from the breather lines or from the oil filler neck, but that top O-ring doesnt seal ****.
Wow the similarities are scary My under hood too was covered w/ oil
I didn't see any oil near my breather lines just on top of the AOS & yes I agree that top O ring doesn't seal ****!
Anyone else have similar experiences?
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Old 06-12-2010, 05:41 PM   #6
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LOL, me too...AOS for the BIN....Rubbish I tell ya.

odd 200 in the BIN too... should list them as a scam.
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Old 06-12-2010, 06:23 PM   #7
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i prefer the air molecules in the engine bay to be caught in a catch can. They are contaminated with fuel and blow by and I'd like that to NOT go back into my oil pan.
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Old 06-12-2010, 10:12 PM   #8
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Quote:
Originally Posted by sense of nature View Post
Wow the similarities are scary My under hood too was covered w/ oil
I didn't see any oil near my breather lines just on top of the AOS & yes I agree that top O ring doesn't seal ****!
Anyone else have similar experiences?
THIS!!! i had oil on top of the AOS unit and it don't work for **** . Came right off the next day, into the junk pile it goes. But comp test came back perfect.
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Old 06-12-2010, 10:30 PM   #9
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+1 to Fuji

Look, nothing against GS but the concept of an AOS on A street car is just dumb. You don't want the crap that blows out of your crankcase back into your oil pan unless you change the oil every 200 miles or less...

A well designed catch can set-up is better for the motor IMO. Catch the blowby filth and drain it away into the recycling bin where it belongs instead of trying to put it back in your oil.



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Old 06-12-2010, 11:02 PM   #10
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Quote:
Originally Posted by soobaviator View Post
+1 to Fuji

Look, nothing against GS but the concept of an AOS on A street car is just dumb. You don't want the crap that blows out of your crankcase back into your oil pan unless you change the oil every 200 miles or less...

A well designed catch can set-up is better for the motor IMO. Catch the blowby filth and drain it away into the recycling bin where it belongs instead of trying to put it back in your oil.



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^^this, I don't want that caca mixing back with my oil.
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Old 06-12-2010, 11:18 PM   #11
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haahah did I say engine bay????? engine crankcase.... sorry...
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Old 06-13-2010, 12:03 AM   #12
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Quote:
Originally Posted by FuJi K View Post
haahah did I say engine bay????? engine crankcase.... sorry...
We knew what u meant
Well I'm sorta glad that I'm not the only 1 that experienced this.. But I'm also pissed off that G.S basically scammed us out of some hard earned money. I'm pretty sure they had to have known ..If not they know now & should properly address this matter ..I.E issue refunds or revise the design .
I'll be posting a review on this shortly w/ the link to this so others wont waste they're money.
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Old 06-13-2010, 10:18 AM   #13
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Well I guess I'm not ordering one of these. Back to a catchcan I go.
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Old 06-13-2010, 11:12 AM   #14
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Just out of curiosity how did you have it installed? Did you still have the pcv valve in there like their instructions? I was also curious how this would work with a turbo that actually flowed a bit of air.
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Old 06-13-2010, 12:49 PM   #15
sense of nature
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Installed it per the instructions to a T.. not that its all that complicated .
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Old 06-13-2010, 01:31 PM   #16
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I really think that leaving in the stock PCV valve is a mistake...but that is just me. I know the directions call to leave it in....but I didn't design the thing, just my experience with big boost and stock pcv valves.
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Old 06-13-2010, 03:12 PM   #17
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How is it working on stock turbo's running 20-22psi?
Any one use it for a road race/track day application?
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Old 06-13-2010, 03:18 PM   #18
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Probably better. You have to figure the system in terms of the amount of air being moved. A VF39 at 22psi may only be moving 550 cfm where a 4088R at the same psi may be moving 1000 cfm. Numbers are not exact, but you get the idea. Blowby is usually a percentage of the total air being moved by the motor. So let's just say 2% (figure given to me by Peterson Fluid systems), the VF39 would have 11 cfm of blowby for the system to deal with where the 4088R would have 20 cfm to deal with....roughly double! The crankcase is going to get much more pressure with the larger turbo.
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Old 06-13-2010, 03:49 PM   #19
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That's what I figured for the most part, just curious what owners that road race feel.
For a larger system, a breather set up seems to work great.
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Old 06-13-2010, 04:39 PM   #20
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Quote:
Originally Posted by crashtke View Post
Probably better. You have to figure the system in terms of the amount of air being moved. A VF39 at 22psi may only be moving 550 cfm where a 4088R at the same psi may be moving 1000 cfm. Numbers are not exact, but you get the idea. Blowby is usually a percentage of the total air being moved by the motor. So let's just say 2% (figure given to me by Peterson Fluid systems), the VF39 would have 11 cfm of blowby for the system to deal with where the 4088R would have 20 cfm to deal with....roughly double! The crankcase is going to get much more pressure with the larger turbo.
Not to mention your 2% figure could go up with a race motor with larger ring gaps, that and once you get enough blowby you will pressurize the area in between the rings and then your ring seal really goes to hell;-)
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Old 06-13-2010, 04:50 PM   #21
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Exactly right.
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Old 06-13-2010, 05:14 PM   #22
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I never understood the reason as to why you would keep your pcv if your running a AOS or catch cans.

Aren't you basically eliminating the pcv system with the installation of catch cans or an AOS?
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Old 06-13-2010, 05:17 PM   #23
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No the pcv system is also there to aid in drawing a vacuum on the crankcase and help with sealing of the rings and seals.
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Old 06-13-2010, 05:33 PM   #24
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Quote:
Originally Posted by mapleleaf View Post
That's what I figured for the most part, just curious what owners that road race feel.
For a larger system, a breather set up seems to work great.
I road race my car very frequently and I run the crawford setup. People making high power and boosting for long periods of time, I don't think the AOS in question would be adequate (just saying based on how it looks).

The inlet and outlet holes look tiny and doesn't look like it can flow a lot of air before creating some sort of restriction.

The crawford setup works great imo, large baffle area, large ID inlet and outlets, big hoses, drain back, zero maintenance. Instead of worrying about the catch can filling up I can check other things while at the track.

I'm sure it's a great alternative for a lower power street setup.
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Old 06-13-2010, 05:52 PM   #25
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Interestingly enough there are a number of copycat products. I wonder if the issues are similar. Again for a pure track car an AOS is no problem because it's worse to lose too much oil than recycle the blow-by into the pan. And the oil does not remain in the engine long enough to do much damage.

For a street car with a few thousand miles between changes use a catch can setup. You should be checking the oil every few hundred miles at a minimum anyway so if you are losing oil you'll know quickly enough to prevent a disaster. Using the right oil also helps prevent blowby.

Keep your PCV system functional!
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