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Old 08-17-2011, 05:32 PM   #1
monkiboy
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Exclamation grimmspeed AOS vs crawford AOS - review

i have had the opportunity to run both of these setups on my car and wanted to provide my input based on my experience with them.

they were/are installed on an 08 wrx daily driver that sees three or four autox sessions a month.

here is a photo of the grimmspeed AOS installed on my car:


here is a photo of the crawford AOS (S0718) installed on my car:
(i ran a braided clear PVC tubing initially to confirm coolant flow and operation; the goodyear hose provided by crawford should be utilized here)






they both installed within 1-2 hours without hiccup or issues. all parts required for installation were included including zip ties, worm-drive clamps, unions, splitters, hose, etc.

the crawford unit has a bit more plumbing involved due to the built in "heater" and tubing to the crankcase. all hose/tubing provided was application specific. what you see in the photos was what i used to verify function of both systems through the use of clear braided hose.

i had the grimmspeed AOS installed for about seven months through the fall and winter months. everything seemingly works fine. the autox season opens up and i start getting the car ready and in doing so decide to switch out sections of the grimmspeed black hose from the three nipples of the main body on the oil filler cap for clear PVC tubing to SEE what is happening and if all was well during my hard driving on the autox course.

unfortunately, with the grimmspeed AOS installed it wasn't more than one or two events that i began to see oil building up around the center nipple that routes to my turbo inlet and after the second event, a very noticeable oil puddle in the that line. my crankcase breather lines had oil build up and the PCV line was mostly clear.


you can see the puddle of oil in my center hose that routes to my inlet:


here you can obviously see the oil was definitely making it's way through the line to my inlet and to the turbo.


i contacted will at grimmspeed who is always a pleasure to talk to and he mentioned he thought it "...might be the perfect mix of a higher HP car and auto-X and short runs. When tested on our track cars the AOS works flawlessly, however in some rare scenarios it can still ingest oil if all other conditions are right when auto-xing because of the much tighter, higher g corners."

he gave me a couple options, one of which included running a catch can on the breather port of the AOS in tandem with the GSAOS. i didn't really feel like having to band-aid a solution together and wanted a setup that would run well under all conditions that i put the car through. another option is that grimmspeed is working on a new version of the grimmspeed AOS that will include a complete redesign which will apparently fix this well documented problem. because i installed clear hoses on my GSAOS, i now knew i had a problem and didn't feel comfortable sitting around waiting for an unknown product completion date.

this is where weeks of research began and long nights of reading of the myriad PCV/catch can vs AOS/dual can setup/mitchi can threads began. after all was said and done, what i kept hearing from folks that had effective setups with similar setups to mine and on builds compared to what mine will be soon, is the crawford AOS is where i need to go or they have a VTA breather setup. a VTA catch can has it's advantages but the disadvantages like the smell of fumes, having to constantly drain, deal with frozen condensation, more often than not poor baffling or separation of vapors from oil, having to check oil levels diligently, etc made it a non-option. so, the crawford AOS, it was.

i ordered one up (S0718) and had it at my door a couple days later.


i had it installed the day before an autox event to put the new AOS through some "testing". it was a pretty fast course, a fast four and five cone slalom and not unlike what my grimmspeed had to deal with after i installed the clear hoses on it and noticing the oil traces and accumulation.

after that first event with the crawford AOS i noticed traces of oil in the crankcase breather lines and nothing but clear braided line for my inlet hose. this was good.

went to my second event with some high speed and sharp tight closed-radius turns, a showcase and all other kinds of fun driving obstacles and the results were similar. checked my inlet and lines and was just the way it should be!

i have four or five more events left this year and will keep this thread updated with any new information. thanks for reading!
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Old 08-18-2011, 01:52 PM   #2
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Very interesting. Yes, please update when you have a few more AutoX events under its belt.
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Old 08-18-2011, 01:53 PM   #3
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Very interesting. Yes, please update when you have a few more AutoX events under its belt.
of course, will do!
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Old 08-18-2011, 11:11 PM   #4
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Hi, I know this may be a dumb question.. But is there any way of maintaining this Crawford AOS unit? I have one in the car, and am noticing a little oil accumulation in the lines. I am just wondering if there is any way I can clear everything out. Sorry for the noob-ish questions.
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Old 08-19-2011, 02:18 AM   #5
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Awesome writeup accompanied by detailed pics earns you tons of cool points OP. After all this time I'd always thought the GSAOS was completely flawless but you sir have exploited a weakness in it's design and I give mad props to GrimmSpeed whom says they will now try and upgrade their product to address this issue. Also, congrats to Crawford Performance for engineering a top of the line AOS that could withstand the harshness associated with autoxing. Keep up the great work everybody for all of this data will only further the technological advancements in tomorrow's automotive industry.
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Old 08-22-2011, 01:27 PM   #6
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Default great writeup

Many thanks to you. Your excellent write up including pictures has swayed my thoughts. I will now exert my purchasing power in the near future.

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Old 08-22-2011, 01:37 PM   #7
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Quote:
Originally Posted by JDM_J03 View Post
Hi, I know this may be a dumb question.. But is there any way of maintaining this Crawford AOS unit? I have one in the car, and am noticing a little oil accumulation in the lines. I am just wondering if there is any way I can clear everything out. Sorry for the noob-ish questions.
the unit itself requires no maintenance. in regards to the lines, i'm assuming you are running clear lines. you can always replace lines seeing how cheap hose/tubing is but you shouldn't have to do that so often. after a while the oil will stain the line and visibility will decrease. you could run some cleaner through the lines with careful attention to its possible detrimental actions on the hose/tubing.


Quote:
Originally Posted by luvless2620 View Post
Awesome writeup accompanied by detailed pics earns you tons of cool points OP. After all this time I'd always thought the GSAOS was completely flawless but you sir have exploited a weakness in it's design and I give mad props to GrimmSpeed whom says they will now try and upgrade their product to address this issue. Also, congrats to Crawford Performance for engineering a top of the line AOS that could withstand the harshness associated with autoxing. Keep up the great work everybody for all of this data will only further the technological advancements in tomorrow's automotive industry.
Quote:
Originally Posted by CTSparky View Post
Many thanks to you. Your excellent write up including pictures has swayed my thoughts. I will now exert my purchasing power in the near future.
Subscribed.
thank you for the kind words guys and i'm so glad to hear it's helpful. i know in dealing with this, i met at least another fifteen or twenty folks with the same problem in similar if not the same type of application. i'll be sure to update with photos and new info as the miles and autox events stack up! research and purchase wisely!
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Old 08-22-2011, 02:16 PM   #8
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Excellent info. I was getting ready to purchase an AOS of a certain brand....but now I think I have changed my mind.

In for updates.
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Old 09-09-2011, 12:09 PM   #9
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Great review...thanks much! I have the Grimmspeed AOS installed. I need to put on a clear line to check things out (I've tracked and autocrossed the car with it on). So did Grimmspeed indicate they're going to replace all of them (ouch)?! I have found Grimmspeed great to work with and have several of their products. They provide outstanding customer service from my experience.
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Old 09-09-2011, 01:07 PM   #10
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Originally Posted by caramall2 View Post
Great review...thanks much! I have the Grimmspeed AOS installed. I need to put on a clear line to check things out (I've tracked and autocrossed the car with it on). So did Grimmspeed indicate they're going to replace all of them (ouch)?! I have found Grimmspeed great to work with and have several of their products. They provide outstanding customer service from my experience.
thank you for the positive feedback. installing 6" or so of clear tubing/hose at the unit is a very good idea, especially considering the motorsports you are involved in and putting the GSAOS through.

grimmspeed is not going to be replacing all of their units, i don't imagine. again, their AOS works fine for a majority of the folks out there. it is those of us involved in motorsports, dealing with high-g turns, and specific maneuvers that create an issue with the current AOS design and what it is capable of. this flaw is what i have demonstrated above. for a DD car, i'm thinking the unit would work well.

i agree that the folks at grimmspeed provide excellent service. they didn't duck and hide when presented with my photos and problems. it made it easier i'm sure that many other folks have reported the same problem. nonetheless, they offered solutions and options to get me on the road with a functional system, and it was not a hassle in the least - good people in my book.

i obviously already have my solution in the crawford AOS as it continues to prove to be functioning quite well but i am eager to hear/see their new design intended for folks that do participate in motorsports events.
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Old 09-09-2011, 04:06 PM   #11
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Thanks for posting this review. I have the Grimmspeed in the mail already. I have a cheapish catch can that someone gave me so I might just rig that up after the AOS to catch an oil that makes its way past. I autocross my car as well so that is a concern for me.

A couple questions for you:

How does the Crawford unit return the oil to the engine? It looks like it dumps back into where the crankcase breather is and I would think that return line would be subject to a vacuum from the catch can... maybe it is and its just not an issue, but I'm wondering how that works.

What's with the clear coolant line? Curious why you have that or why you wanted to monitor your coolant flow.
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Old 09-15-2011, 06:16 AM   #12
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great info.hmmm my setup/use is similar to yours. i need to get some clear lines so i can monitor mine when it's back on the road. i've purchased a lot through grimmspeed, i wonder if they'll have any incentive for guys like me with this AOS that would want to upgrade to their newer design, hope so.
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Old 09-30-2011, 07:22 PM   #13
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interesting.
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Old 10-07-2011, 05:46 PM   #14
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Quote:
Originally Posted by WRXt4cy View Post
Thanks for posting this review. I have the Grimmspeed in the mail already. I have a cheapish catch can that someone gave me so I might just rig that up after the AOS to catch an oil that makes its way past. I autocross my car as well so that is a concern for me.

A couple questions for you:

How does the Crawford unit return the oil to the engine? It looks like it dumps back into where the crankcase breather is and I would think that return line would be subject to a vacuum from the catch can... maybe it is and its just not an issue, but I'm wondering how that works.

What's with the clear coolant line? Curious why you have that or why you wanted to monitor your coolant flow.
The clear line is for the coolant "warming" they need for their unit to avoild excess milky substance.

Quote:
Originally Posted by sk84fun21 View Post
great info.hmmm my setup/use is similar to yours. i need to get some clear lines so i can monitor mine when it's back on the road. i've purchased a lot through grimmspeed, i wonder if they'll have any incentive for guys like me with this AOS that would want to upgrade to their newer design, hope so.
Shoot us a PM if you have not already, I would be interested in talking with you!

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Originally Posted by bue car View Post
interesting.
? Do you have any further questions?

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Old 10-07-2011, 05:57 PM   #15
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Will,

I will email you tonight.. such great service from you guys
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Old 11-01-2011, 02:28 PM   #16
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Anybody let us know if you have any questions right away!

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Old 11-01-2011, 03:03 PM   #17
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monkiboy, thanks for posting up a review on the Crawford AOS.

I currently have the GrimmSpeed AOS and I have the white gunk everywhere... I look forward to switching to the Crawford in the springtime.
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Old 11-01-2011, 06:52 PM   #18
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I noticed that i was getting a considerable amount of oil between the turbo and TB with the GS AOS when i was doing long commutes (100+ miles per day) on the freeway, but not so much now with my much shorter local commute. I was going through 2/3 qt per 1k miles before, but now 2/3 qt per 3k. So there's certainly conditions that the GS AOS doesn't work well in.

I'm thinking of doing the bandaid solution of the adding a catch can. Where does the lines need to connect to and from the GS AOS?
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Old 11-12-2011, 05:35 PM   #19
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Has anyone found a way to run the lines without covering the intake manifold?
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Old 11-12-2011, 06:01 PM   #20
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run them any way you like...
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Old 11-13-2011, 09:12 PM   #21
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Quote:
Originally Posted by Fierysun View Post
I noticed that i was getting a considerable amount of oil between the turbo and TB with the GS AOS when i was doing long commutes (100+ miles per day) on the freeway, but not so much now with my much shorter local commute. I was going through 2/3 qt per 1k miles before, but now 2/3 qt per 3k. So there's certainly conditions that the GS AOS doesn't work well in.

I'm thinking of doing the bandaid solution of the adding a catch can. Where does the lines need to connect to and from the GS AOS?
You would add it to the line that goes back to your intake inlet.
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Old 11-13-2011, 10:37 PM   #22
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The GMS unit is nice for a stockish daily driver. If you have a built motor or big turbo you will get tons of oil in the inlet which will lead to detonation and other problems. Just today we did a few pulls on a built motor car with the GMS and noticed tons of smoke out the exhaust, the inlet was full of oil after 2-3 pulls. Ended our racing for the day.

I personally hate crawford, but the catch can they build is the best bolt in application you can buy and worth the extra few bucks.
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Old 11-18-2011, 01:50 PM   #23
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There is a group but on the Crawford starting today!
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Old 12-22-2011, 08:32 PM   #24
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I run the Grimmspeed AOS on my Rsti build. I run an 08 sti short block with 09 wrx heads on an Fp hta 68 turbo with wiseco higher compression pistons. Put down 319 whp and 343 wtq and so far haven't had to many issues. Since I was going from an 04 Wrx set up I deleted my pcv system.



My only issue has been like mentioned above. I didn't even do a tack day or anything. Still was rocking my sti rims and tires and took an off ramp fast. Got home from there in maybe 5 min. The next morning I started up my car and a ridiculous amount of smoke poured out of my exhaust filling my garage up. I thought I really screwed something up. It puffed up smoke once more at my lunch break and that was a couple weeks ago. Since I haven't driven like that I have had zero issues.

Other then that I love it. Pretty sure I have it run correctly without the pcv but searched and it seems no one really deletes this on the newer style crankcase style.
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Old 12-27-2011, 09:31 AM   #25
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Are there any drawbacks to the Crawford AOS not using the PCV system, I want to get in on this Crawford Group Buy (Just saw it yesterday, not much time left) but I was also looking at the Moroso AOS, I like that the Crawford is maintenance free but the Moroso AOS keeps the PCV system intact and looks easier to reverse. My main concern is the PCV system though, anyone know if this should really be a concern of mine?

Cancel that, found the explanation I was looking for earlier today in case anyone was interested here is the link below.

http://www.iwsti.com/forums/2-5-lite...-answered.html

The link provides answers to just about everything I was wondering about the Crawford AOS and answered my concerns about the PCV system.

Last edited by Gixhost; 12-27-2011 at 11:45 PM.
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