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Old 12-01-2012, 10:54 PM   #1
idratherbesurfing
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Default Crawford or Grimspeed AOS?

I understand what these products are supposed to do, but they are such different looking set ups with the same purpose which would be better? I have a 2011 STI custon stage 2 tune. Ive taken my IC off many times and i always have oil in it so i figured i should get one of these. whats your thoughts...
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Old 12-01-2012, 10:59 PM   #2
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Well, one works fairly well, the other...Not so much.
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Old 12-01-2012, 11:05 PM   #3
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One collects the oil blow by (Crawford)the other one recirculates it to the intake/ back to the oil pan (GrimmSpeed)

GS aos have been know to allow oil to slosh back up into the intake tract on hard right turns.

Crawford: awesome for track does what its supposed to. You have to empty it periodically though.

GS: set it and forget it don't use it on the track, unless you like burning oil.

I personally use the GS and have no problems with it, but I also do not track the car. It has definitely stopped all/most of the blow by making it to the tmic, and I only burn an 8th~16th of a qt per oil change (3750 mi)

~Evil
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Old 12-01-2012, 11:10 PM   #4
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Quote:
Originally Posted by EvileyeZ88 View Post
One collects the oil blow by (Crawford)the other one recirculates it to the intake/ back to the oil pan (GrimmSpeed)

GS aos have been know to allow oil to slosh back up into the intake tract on hard right turns.

Crawford: awesome for track does what its supposed to. You have to empty it periodically though.

GS: set it and forget it don't use it on the track, unless you like burning oil.

I personally use the GS and have no problems with it, but I also do not track the car. It has definitely stopped all/most of the blow by making it to the tmic, and I only burn an 8th~16th of a qt per oil change (3750 mi)

~Evil
No the Crawford returns back to the pan via the bottom hose on the can attached to the pcv fitting on the block
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Old 12-01-2012, 11:53 PM   #5
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Don't get either and save all that money as I've been on this forum since 1865 and have a favorite quote:

My car exploded due to the lack of an oil catch can/air oil separator----nobody
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Old 12-02-2012, 12:03 AM   #6
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Unabomber, the same could be said for intakes, downpipes, or any mod really...It's not like it's a bad idea to get one. I do think that you can often spend that money elsewhere, but it's just a way to keep oil out of the intercooler and keep it more efficient.
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Old 12-02-2012, 08:39 AM   #7
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^ +1

Who said anything about AOS keeping your car from exploding? A mod is only worth it if it keeps the car from blowing up?



Every turbocharged subaru I've owned without AOS had oil in the intercooler...the intercooler in my current 2012 STI with a GS AOS is bone dry, which makes it more efficient.
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Old 12-02-2012, 09:26 AM   #8
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Quote:
Originally Posted by EvileyeZ88 View Post
One collects the oil blow by (Crawford)the other one recirculates it to the intake/ back to the oil pan (GrimmSpeed)

GS aos have been know to allow oil to slosh back up into the intake tract on hard right turns.

Crawford: awesome for track does what its supposed to. You have to empty it periodically though.

GS: set it and forget it don't use it on the track, unless you like burning oil.

I personally use the GS and have no problems with it, but I also do not track the car. It has definitely stopped all/most of the blow by making it to the tmic, and I only burn an 8th~16th of a qt per oil change (3750 mi)

~Evil

Only track would be the 1/4 mile. thanks
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Old 12-02-2012, 09:27 AM   #9
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Yeah it seemed like the crawford would be more work to take car of. Well if i buy one ill most likely get the GS. thanks guys
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Old 12-02-2012, 09:28 AM   #10
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Quote:
Originally Posted by WRXLTD View Post
^ +1

Who said anything about AOS keeping your car from exploding? A mod is only worth it if it keeps the car from blowing up?



Every turbocharged subaru I've owned without AOS had oil in the intercooler...the intercooler in my current 2012 STI with a GS AOS is bone dry, which makes it more efficient.

You had a lot of oil in the IC? i get a pretty good amount sometimes
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Old 12-02-2012, 09:35 AM   #11
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Oil in the intercooler is normal mind you.
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Old 12-02-2012, 09:46 AM   #12
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Quote:
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Oil in the intercooler is normal mind you.
For a Subaru, yes...but it doesn't mean it's a good thing.
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Old 12-02-2012, 09:48 AM   #13
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Quote:
Originally Posted by Unabomber View Post
Don't get either and save all that money as I've been on this forum since 1865 and have a favorite quote:

My car exploded due to the lack of an oil catch can/air oil separator----nobody
^ THIS!
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Old 12-02-2012, 11:30 AM   #14
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Quote:
Originally Posted by WRXLTD View Post
For a Subaru, yes...but it doesn't mean it's a good thing.
Correct. Any oil in the intercooler is reducing its efficiency, and that oil in your intake air is reducing your octane.
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Old 12-02-2012, 12:53 PM   #15
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Quote:
Originally Posted by idratherbesurfing View Post
Yeah it seemed like the crawford would be more work to take car of. Well if i buy one ill most likely get the GS. thanks guys
Huh:lol
how do u figure the Crawford aos would be higher maintenance???
For every day use go with gs aos, if u r ever considering tracking or otherwise go with the Crawford aos especially if u live where u will be driving in the winter as they utilize your turbo coolant lines so condensation will not freeze up your vacuum lines.
Do a search there is lots of info about people having issues with the gs aos. Gs makes good products but from what I've read I won't touch their aos.
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Old 12-02-2012, 01:11 PM   #16
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Whoa, reading the crawford aos description this sounds like one of the few mass market aos that are actually designed correctly. At the very least they make it sound like they did it right. I wont run a normal catch can draining back to the pan, I've run multiple manual drain ones and you get serious milk shake built up in there, crawfords sounds like it should mitigate that problem. At least they realize its a problem.
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Old 12-02-2012, 01:37 PM   #17
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Yea i currently have a grimmspeed aos. Its for sale if anyone wants it. I removed it after advice from a tuner. He says remove it asap. The milky residue left behind is not good at all. After the residue accumulates it mixes and u get half water half oil.. Not good at all
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Old 12-02-2012, 02:48 PM   #18
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Leafy, the Crawford one really is about the only one. That's why I'm getting one for my built engine...But that's different than on a stock motor.
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Old 12-02-2012, 04:20 PM   #19
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Are there numbers out there showing the cooling differences of a TMIC w/ and w/o an AOS for everyday driving purposes?
I can understand the crawford piece in racing applications as you are constantly under boost and temps are always an issue but for DD?
This question also applies to octane rating. I keep hearing about blow-by decreasing octane rating but I haven't seen any numbers.
Are some of you guys running your cars at the level where even a fractional drop in octane or TMIC temps is going to be detrimental to your engines?

Not poking here. I'm just asking honest questions.
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Old 12-02-2012, 05:09 PM   #20
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Quote:
Originally Posted by Schikane View Post
Are there numbers out there showing the cooling differences of a TMIC w/ and w/o an AOS for everyday driving purposes?
I can understand the crawford piece in racing applications as you are constantly under boost and temps are always an issue but for DD?
This question also applies to octane rating. I keep hearing about blow-by decreasing octane rating but I haven't seen any numbers.
Are some of you guys running your cars at the level where even a fractional drop in octane or TMIC temps is going to be detrimental to your engines?

Not poking here. I'm just asking honest questions.
Although a valid point!! But I don't think its what the op is looking for and believe posting a thread about your question would get answered more appropriately.
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Old 12-02-2012, 05:58 PM   #21
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Quote:
Originally Posted by Leafy View Post
Correct. Any oil in the intercooler is reducing its efficiency, and that oil in your intake air is reducing your octane.
Minimal.

As very little is in the intercooler/system at any one time, you'll never truly see any difference.
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Old 12-02-2012, 06:26 PM   #22
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^^^Except in a front mount, it will collect and just sit...

OP probably doesn't have a front mount, but it's worth mentioning.
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Old 12-02-2012, 07:31 PM   #23
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Quote:
Originally Posted by HinshawWRX View Post
Minimal.

As very little is in the intercooler/system at any one time, you'll never truly see any difference.
If you cut your stock top mount open right now. Ever single surface of it will have a fine oil film. The if the thickness of the oil film was known and the heat transfer coefs of the oil were known you could easily do the math to see how much it reduces the efficiency by. Octane wise, we know the octane of the oil, we dont know what mass is in the air stream. And the ratio of the oil mass to the fuel mass in the intake charge will determine how much it lowers the octane by.
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Old 12-02-2012, 07:33 PM   #24
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Crawford unit is better. Hands down.
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Old 12-02-2012, 08:32 PM   #25
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I've used both the GS and Crawford.
The GS didn't work for me (suspect it was related to the power I'm making, +400whp)
I choose the Crawford because it was maintenance free, heated and came highly recommended.
The Crawford is my choice, I can't recommend the GrimmSpeed.
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