Such an underrated channel. Pure content, eager to experiment, and continuing to see projects all the way through. Flatirons Tuning, you deserve more subs
What an awesome, completely amazing and in-depth video. I have watching this video several times and continue to pick up on things. Thanks so very much.
I mounted the cruise control 8n my 02 WRX to the back of my Cobb air box. Basically, between the air box and the strut tower below the boost control solenoid. No wires cut and the only holes drilled are in the side of the air box.
These videos are great, coming from Facebook groups there is so much misinformation and confusion out there I constantly suggest people take a look at your videos!!
Thanks very much Benjamin, and thanks for watching! We are doing our best to get good information out there, and I'm glad that it has been helpful. Thanks for spreading the word!
Radium themselves make a bracket to relocate the cruise control module to a lower position so the AOS will fit above it. I have a Perrin AOS and working cruise control on my 2002 thanks to that.
Hey, I know this is old but hopefully you see this. I recently had an IAG V3 Comp AOS installed and just wanted to make sure that its normal to get a little smell of gas/oil? By no means is it overwhelming or overly noticable but the scent is there. Thats just the extra blow by gases being dumped into the atmosphere, right?
Thanks for your question. Yes, you are correct. Since the crankcase gasses are being sent to atmosphere, it would be normal to smell a bit of fuel or hot oil as those vapors that would normally be trapped are now not being contained. Glad this video helped and Stay Tuned!
I have another test idea for you. The question being, does the plumbing of the coolant really impact the temperature of the AOS? Get yourself access to a Flir camera. With the coolant plumbed in, run the car up to temp and then check the temperature of the AOS housing. Noticing any temperature gradients from top to bottom. With the coolant NOT plumbed in, run the car up to temp and then check the temperature of the AOS housing. Noticing any temperature gradients from top to bottom. I would love to know if at operating temp, does the coolant really make a difference, or would the overall radiant heat in the engine bay be bringing the AOS housing to the same temp. I am guessing that there may be some differences in the rate that the AOS housing comes up to temp, but that would be a few minutes of temperature difference between with and without coolant. I am thinking that the overall engine bay temps determine the AOS housing temp more than the collant.
Thanks for your question Adam. Well, I can tell you that I made the mistake of touching the bottom of the can when I was running the car to burp the coolant. And it was absolutely hot :-) We don't have a Flir camera, but we may look into it. Thanks for watching!
Thanks for your question Brandon. If you got the street series, that doesn't require any custom tuning. If you got the Competition Series, which is an atmospheric dump, then that does require tuning to make sure that you are running properly. Thanks for watching!
Would you recommend the radium aos over the iag street series for our ej205 motors ? I see the radium deletes the pcv while the iag retains the pcv valve,
Thanks for your question. I'd recommend you take a look at the AOS Buyers Guide that we did recently: th-cam.com/video/OjoA2qXujMA/w-d-xo.html You actually do want the PCV valve for street cars actually, and I'd recommend the IAG over the Radium actually. www.flatironstuning.com/iag-v3-street-series-air-oil-separator-04-07-sti-06-07-wrx Thanks for watching and Stay Tuned.
Thanks for your question. Radium does now sell a cruise control bracket so you can keep your cruise control, and IAG has directions to modify the stock bracket to relocate the CC module so you can keep it as well. It can definitely be done. Hope that helps and thanks for watching!
Thanks for watching Josh. It is honestly really interesting. It moves much less than you would guess, but it is pretty eye opening. I'm not ready to make a video about what I are seeing, as I am trying to take a look at multiple cars to make sure that my understanding is as correct as possible. It is pretty convenient just being able to just move an oil cap around :-) Stay tuned, but it will most likely be a few more weeks before I put something out about it. If you are curious, you should definitely try it out. Thanks again for watching, and stay tuned!
Hey Jon awesome video as always! Mate I might have missed the follow on from this, but did you find out how effective the IAG was at stopping oil going back into the intake and also did you find out what the composition of the "blow by" was that was being returned back into the oiling system? I know the report from the other video said that they wouldn't recommend this to be returned back into the oil system, curious if the stuff being returned by the IAG is in fact ok??
Thanks for your question. I'm not sure if we discussed that specifically. Basically, with the IAG AOS, as long as the drain is working well, the IAG should be able to remove pretty much all of the oil that would get to the intake track. I hope that helps and Stay Tuned!
I have the Grimmspeed AOS purely for street driving. I understand the drawbacks but would I benefit from moving the breather tube closer to the Turbo? Standard procedure is to connect it further down the inlet towards the air filter. I've had some oil consuption issues with higher speed cruising back home (engine @4k rpm and over).. The PCV valve was sticking as well. Fixed that, now trying to optimise the rest of the system.
Thanks for your question. You could certainly try it. From what we have seen, there are issues with the internal design of the part as well, but it would not hurt to try a different configuration to see if you notice any improvement. Hope that helps and Stay Tuned!
I need help. I'm currently running a IAG AOS on my 16 wrx. I've had it on my car for almost a year. Never had a problem until now. I've noticed my idle is high when it's warmed up at 1500 rpm's. I checked if I had and vacuum leaks any exhaust leaks and everything checked out good. I decided to check the check valve/ pcv line pinched it a little with some clamps. This helped the idle to go down to normal. Do you think a bad pcv line is what is causing the idle to be high? Let me know please.
I recently had my wrx tuned and have been looking to add an aos. I really like the radium design but seeing as it removes the factory pcv I’m a slightly worried about it affecting the tune. Did you guys end up doing a retune on the 2.0 to adjust for it or decide it couldn’t affect things too heavily?
Thanks for your question Frank. I believe you are talking about the PCV valve specifically? The Radium does remove that, but the PCV valve itself is only open when the manifold is under vacuum, so removing it will not effect the tune. There will be less gas movement when the throttle is closed, and worst case, that could cause more deposits in the case and valve covers long term, but it should have a minimal effect on a track car. Hope that helps, and thanks for watching!
Thanks for your question. At this time, I can only recommend either the IAG or Radium kits at this time. My best recommendation would be to look at the video that we did about the function of the PCV system, and compare that to the install instructions of the Grimmspeed AOS, and decide if you feel comfortable with their routing, etc. Hope that helps, and thanks for watching!
Hi grade video, I have a question, if I only have the plumbing from the covers to the crankcase and seal all other and eliminate the PVC in the hose of the PVC put a hose to oil catch can whit a baffled then another hose to a venturi. It works?
Thanks for your question. You could certainly try it, but from what you describe, it sounds like you would be limiting the crankcase's ability to release pressure. My best advice would be to look at the stock routing, and make sure that even if you are significantly modifying it, that you retain the 2 1/2" ports that allow the crankcase to breath. Hope that helps and Stay Tuned!
hey Jon my name is Michael Cooley. small world lol can a bad pcv valve after being replaced have residual symptoms left over from the oil build up in the cylinders?
Thanks for your question! If you did have a bad PCV valve, which lead to oil getting into the inlet, yes, that can leave behind an oil residue which will generally stick around until you thoroughly clean it up. The main points here would be the turbo inlet hose, and the intercooler. I hope that helps and Stay Tuned!
Thanks for the great Subaru content, just found this channel a few weeks ago and have spent way too much time already going through all of your videos :) Actually picked up a Radium Engineering AOS after seeing this video. Went to install it last night on a 2006 WRX and ran into a slight issue that I was hoping you might be able to shed some light on, having been through the install. The 3/4'' drain hose to the crankcase port on my setup (EJ25/TD05-20G/Silicone TIP/Process West TMIC) seems to have a slight uphill section no matter how I orient it. Did you run into this issue and, if so, were you able to resolve it? Just FYI, my kit came with a 45 degree fitting for the bottom port; I was thinking that I could gain just a tiny bit of clearance by using a straight connector.
Glad that you found us and that the videos were helpful! That is a tough one. We put a 90° adapter on the top of the block fitting of the block, and I think that helped with the drain angle. It is definitely hard to do with a top-mount intercooler. I hope that helps and Stay Tuned!
I have 2 questions for my 2011 stage 2 STi: 1) Would you suggest a catch can or AOS? 2) Which brand of above answer would you suggest? (Not concerned with cost)
Thanks for your question. That all depends on how much, if any, oil you are using between changes. If you are using minimal oil, then a catch can would be fine. I think that the Radium dual catch can is the best option there. www.flatironstuning.com/radium-catch-can-kit-08-14-wrx-sti-15-sti If you are using more oil than you feel comfortable holding in a catch-can, that is where the AOS comes in. Curently, I'd recommend the IAG Street Series, or the Cobb AOS, or the Radium AOS: www.flatironstuning.com/cobb-tuning-04-19-sti-06-14-wrx-aos www.flatironstuning.com/radium-air-oil-separator-subaru I hope that helps and Stay Tuned!
I bought a Godspeed basic Catch Can. It has two ports. I am assuming it should go in between the line that goes back into the intake in a 1 can system? Is it worth it?
Thanks for the question Eric. My best advice is to keep one can per line when installing a catch can. Pick the line that you want to intercept, and run it to and from the can. I wouldn't recommend plumbing multiple lines to a single can. Hope that helps, and thanks for watching!
How exactly does the vent to atmosphere style AOS affect the tune? Working on installing a IAG unit in my car. Currently have a COBB Stage 1 tune. Will it be safe to run on that tune? At least temporarily until funds allow for the dyno tune.
Thanks for your question. The short answer is no. If you are going to install the IAG AOS with the atmospheric dump, you would need to be tuned for it. I would not say that it is safe to use it with an OTS tune, but if you have to drive to your tuner, you would just need to stay out of boost as much as possible. Thanks for watching, and good luck with the install!
So I have an iag comp on my car and I'm about to do flex fuel and probably just gonna be hitting around 340-350hp. Are there any drawbacks besides shorter oil change intervals to keeping my aos atmospheric? Is it ok to keep it? Or should I just convert it to recirculating?
Thanks for your question. That is up to you. For street cars, we do recommend the IAG Street AOS. You can convert your Comp series to that if you like. For the power target you have, you should not need to vent the PCV to atmosphere. I hope that helps and Stay Tuned!
Thanks for the info. I'm a complete beginner at this stuff so please forgive me if my question is dumb, but why doesn't Subaru install an AOS as a stock item and make it vent to atmosphere? Seems like that is the best solution (no oil intake and no spent exhaust intake). thanks.
Thanks for watching, and thanks for the question. Subaru does actually put in an AOS on the back of the block. We have a detail of it in our PCV Video, and I'll link to that below. As far as not venting to atmosphere, that is because it is not allowed by the emissions requirements that are in place. For a vehicle to be street legal, all combustion gasses have to go through the catalytic converters and out the exhaust. Here is a link to that PCV video that shows the factory AOS. That content starts around 4:20 in the video. th-cam.com/video/mO9mxDUDUDc/w-d-xo.html
Thank you so much for the reply. As I was writing the question before I wondered if indeed there was already some type of AOS from factory, but in everything I have read I can't remember it being mentioned "a stock AOS". I will now proceed to watch the video you linked to. Thank you again :)
Wouldn't removing the PCV valve make it no longer emissions compliant because a component of the factory equipped emissions control system has been removed?
Thanks for your question. If you have a street car, and you want to make sure that you will still pass your emissions, I'd recommend getting clarification from them as far as how much you are allowed to adjust/move hoses, etc. Thanks for watching and Stay Tuned!
Could you use this setup from your yellow WRX on an ej25? Even though the 25 has the extra plumbing going from the crankcase to both valve covers for equalization?
I have retained the factory "balance" ports between the crank case and valve covers, but have the other two valve cover ports and crankcase ports just venting straight out to atmosphere with breather filters, the PCV valve has been removed and has been blocked off. Could this setup cause smoke out of the exhaust? Is there a issue with this setup? Could this alter my MAF scaling as I am getting high amounts of negative correction, is this to be expected? I plan to eventually route the lines to a catch can then have it vent to atmosphere.
Thanks for your question Booki. If you are simply venting to atmosphere, this should not cause any smoke through the exhaust. However, if you have routed the vents in such a way that prevents the crank case pressure from dissipating, or are using a restrictive filter media that does the same, this can cause pressure to build up in the case, and that in turn can prevent the turbo from draining, and that will cause smoke out of the exhaust. I would recommend putting a gauge on the oil cap as we have done, and see if you are getting up into positive crank case pressures. As far as the MAF scaling, yes this configuration would need to be tuned for. As we have discussed in previous videos, if you remove the connection between the inlet and the crank case, you must tune to account for the fact that you will not be pulling in a percentage of spent air from the crank case. I hope that helps, and thanks for watching!
Thanks so much for the detailed response! I will try and check my crankcase pressures. Its interesting you mentioned the turbo not being able to drain corretly... I have had issues previously with a "wet" hotside on my turbo. I have just put on fresh cylinder heads though so will be keeping a eye on it.
Thanks for your question. There are no long term issues as long as you have a good filter on the vent. You wouldn't want to pull in any dust or debris. And just keep in mind that you will have to tune the car for a vent-to-atmosphere system if it didn't come with that from the factory. Thanks for watching!
Thanks for your question Bill. Basically, if you are recirculating the AOS, then you want to have the PCV valve connected. If you are venting the AOS or catch-can to atmosphere, then you must delete/remove the PCV valve. I hope that helps, and thanks for watching!
I wanted to buy the IAG AOS for my car but i have a 2002 wrx .. All the kits are for 2004 and up .. Do u know if the kit for 2004-2007 works on the 2002?
Hi, I have a daily driver 2007 wrx and it burns about a quart of oil per oil change (~2500-3000 miles) and was wondering if this is fairly normal and if it was most likely in need of an aos (I was thinking the grimmspeed aos since its an easy install and fairly decent priced) or if i should look somewhere different. Thanks
Thanks for your question Brett. Going through a quart of oil is right on the higher side of what I would call normal. The first step, especially as your car is now 10+ years old, would be to go through the engine, and look for any signs of leaks, etc. And make that you aren't leaking out anything from the valve-covers, PCV system, etc. The next step would be to remove your intercooler and look for signs of oil in the intercooler and at the throttle-body to get a sense of how much liquid oil may be going through your PCV (there will almost certainly be some there, but how much). If everything is working properly, and there are no signs of leaks, etc., then you may want to consider an AOS or catch can. Suffice it to say that ease of install would not be a good criteria for picking a solution. If you aren't going through oil quickly, and you aren't tracking the car, etc., then a good catch can may be a good solution for you. But you would certainly have to keep an eye on it. If you want an AOS, the two that we have ran are the Radium and IAG, and those would be the ones that we would recommend looking at. I hope that helps, and thanks for watching!
Thanks for the feedback! The intercooler coupler slipped out from beneath one of the clamps (it was loose) and there was a decent amount of oil just sitting in the coupler so I'm assuming its time for an aos or catch can. Since I'm in college I'm trying to keep costs down a bit so i was wondering what to look for in a catch can to make sure it will catch most of the oil. Or should i just go with a good name brand one like Mishimoto or Cusco. Do I need a 2 or 3 port catch can? Thanks for all your help!
Thank you. Amazing vedio. I have learned from you that the ej205 has only 2 lines coming out from valve covers, while the ej25 has 3 lines coming out. 2 from the valve covers. and 1 from the middle of the block. Can I install an AOS that designed for Ej25 on ej205? (like iag aos comp) Also is there any way that I install aos withot removing my front strut bar? appreciated
thanks for your question. I would first recommend that you watch the video we did about the PCV system, so you have a solid understanding of what each group of hoses does before attaching an AOS. Here is a link to that: th-cam.com/video/mO9mxDUDUDc/w-d-xo.html The short answer is that yes, you can install an AOS onto your car, and properly route it. This is because the lines that the 2.0 liter has are the ones that are the functional part of the PCV system, and those are the ones that need to be addressed. The extra lines are just for balancing the pressure of the crank-case, so you would not send them to the AOS even if you had the 2.5 liter engine. As far as keeping your strut bar, that is going to be quite difficult. Since they don't do much on a Subaru, I would say that the AOS would be much more important if you need one, but there is always a chance that you will be able to get everything to work together. Hope that helps, and thanks for watching!
Thanks for your question Sasa. Diesel's work completely differently than internal combustion engines, and I don't feel like I can adequately answer your question. It may be okay, but if your car is a modern diesel, it could still cause some issues. I would recommend first looking for a company that makes a catch can or separator for your car, as they should have testing to make sure that it will work properly. If one is not available, then I would recommend talking to a shop that specialized in working with your car and see what they recommend. Sorry I can't give you more guidance than that. Thanks for watching!
Most likely that is correct, now for a few reasons. The two main ones being the vent to atmosphere, and the tune required to get the car running properly as well in that state. Thanks for watching and Stay Tuned!
So, the question is. Is there enough vacuum in the inlet at closed throttle in order to create vacuum in the crankcase? if there is enough vacuum, there is no point of running the PCV and this radium system will be the safest way to go
Thanks for your question. There isn't a vacuum at the turbo inlet when the throttle is closed, but because you are off throttle, the need to scavenge the crankcase is much less. I believe that is why a number of AOS systems remove the PCV all together. That being said, I do think that there are some advantages in keeping the PCV in place. Most of the time, this can be done quite easily with a small adjustment of the plumbing. Hope that helps and Stay Tuned!
@@FlatironsTuning You are the best! thanks a lot for all the info you provide !! :) :) I also tried the oil filler cap vacuum monitoring and it is amazing to see the differences! thanks again.
I would love to see a video on the GrimmSpeed AOS. This was always controversy on that specific system. It would be nice to finally have some good truth about it. The information I have come across say that the GS AOS is good for daily driven cars that don't see high boost and have light modification. I run the GS AOS is that exact application and I would say it does it job well. I haven't noticed any issues but again I am only one soul out of many. So it would awesome if you could do a review for us at some point i the future on the GS system and offer other recommendations for light hp cars. I am running it on a 2.0l wrx with an sti 6 speed, external wastegate and 565cc injectors ect. So simple put, its lightly modded. If you could tells us when it would be a good idea to upgrade to a better system. Like either a power level or based on modifications. Also thank you for helping me with the 6 Speed swap last year! Flatiron tuning is what the internet has been needing for a very very very long time.
Thanks for your question, and glad that we helped with your 6MT swap! I will be honest and tell you that I don't think that we will do an in depth test of the GS AOS. I don't really want to take a hyper-focused look at a single manufacturer's solution, and test how well they have designed a part/solution. Rather, we are trying to go into more depth about how things work, and what to look for, etc., so that you have the information to make an informed decision. And honestly, the same criteria for the OEM PCV system would pertain to the GS AOS as well. If you start to see oil consumption, and you can trace the flow of the oil back to the AOS itself, that would indicate that that system is not solving your problem sufficiently any longer, and you would want to look for a better set-up. One of the tricky things about the function of the PCV system in general is that there are a ton of variables at play, and many conditions that come into how the system works. We are starting to get a sense of what is going on, but we are a long way from being able to say anything definitive. We are always collecting more information, and as soon as we can, we'll post it up. Thanks again for watching, and thanks for your question! Don't hesitate to reach out if anything else comes up!
Honestly, I'd be very weary of the Grimmspeed AOS. It is built to drain into your oil filler cap. Well, what happens when your crankcase pressure rises? It can't drain and instead blows more into your intake (Theory). Search youtube and you'll find a review in which they added a catch can in the GS AOS return line and caught a bunch of oil during a track run.
Dude please do more Subaru fundamentals. My Subi grenaded 20 miles after me getting while I had cruise on doing 70mph I got a new shortblock but I scared to death to put parts from the old shortblock on it for fear of going through another engine. I can’t afford everything new so please help man more videos like these
Sorry to hear about your engine trouble. I'd recommend taking a look at this video, as it might be a help as well: th-cam.com/video/St4WfvUh_88/w-d-xo.html Thanks for watching and Stay Tuned!
Thanks for your question. For a stock car that is street driven, you shouldn't need an AOS. At most, a catch can should be able to catch any blow-by that you are generating. The best gauge of how much you need to work on your PCV system is how much oil you have to add between changes. If you don't need to add any, then you are having minimal movement through your PCV, so you don't really need to intervene that much. I hope that helps, and Stay Tuned!
you do NOT need a tune if your venting to atmosphere. crank case pressure varies way to much between engine speed,temp, and just depending on the car like miles and how you drive it to be accounted for in the tune not to mention that air already isnt accounted for because its after the maf anyway
I have to say from our experience this is not correct. The change in fueling that you can see by removing the crank case gases can be enough to require a re-tune. At an absolute minimum, I would say you would want to work with a tuner to closely monitor any changes that the ECU is seeing, and tune accordingly. With something like this, you have to be very cautious because if even under curtain circumstances you are pushing the ECU beyond it's limit to correct for a change, you can cause damage to your engine. Thanks for your comment, and thanks for watching!
Such an underrated channel. Pure content, eager to experiment, and continuing to see projects all the way through. Flatirons Tuning, you deserve more subs
That is an awesome comment Bill, and thank you.
We'll keep doing what we do :-)
Thanks for watching and stay tuned!
Radium themselves make a cruise control locating bracket. Very easy install, retained my cruise control on my 04 wrx
What an awesome, completely amazing and in-depth video. I have watching this video several times and continue to pick up on things. Thanks so very much.
Very glad that you found the video and that it was helpful.
Thanks for watching and Stay Tuned!
I mounted the cruise control 8n my 02 WRX to the back of my Cobb air box. Basically, between the air box and the strut tower below the boost control solenoid. No wires cut and the only holes drilled are in the side of the air box.
These videos are great, coming from Facebook groups there is so much misinformation and confusion out there I constantly suggest people take a look at your videos!!
Thanks very much Benjamin, and thanks for watching! We are doing our best to get good information out there, and I'm glad that it has been helpful.
Thanks for spreading the word!
I'm about to install a mishimotto 2 can system in my 10 WRX, nice job!
Sounds good Aaron. Good luck with the install!
Radium themselves make a bracket to relocate the cruise control module to a lower position so the AOS will fit above it. I have a Perrin AOS and working cruise control on my 2002 thanks to that.
Yes, they do make a bracket now, which is niced for sure.
Thanks for watching and Stay Tuned!
my bugeye thanks you for your service
Awesome! Thanks for watching and Stay Tuned!
Hey, I know this is old but hopefully you see this. I recently had an IAG V3 Comp AOS installed and just wanted to make sure that its normal to get a little smell of gas/oil? By no means is it overwhelming or overly noticable but the scent is there. Thats just the extra blow by gases being dumped into the atmosphere, right?
Thanks for your question. Yes, you are correct. Since the crankcase gasses are being sent to atmosphere, it would be normal to smell a bit of fuel or hot oil as those vapors that would normally be trapped are now not being contained.
Glad this video helped and Stay Tuned!
I have another test idea for you. The question being, does the plumbing of the coolant really impact the temperature of the AOS?
Get yourself access to a Flir camera.
With the coolant plumbed in, run the car up to temp and then check the temperature of the AOS housing. Noticing any temperature gradients from top to bottom.
With the coolant NOT plumbed in, run the car up to temp and then check the temperature of the AOS housing. Noticing any temperature gradients from top to bottom.
I would love to know if at operating temp, does the coolant really make a difference, or would the overall radiant heat in the engine bay be bringing the AOS housing to the same temp. I am guessing that there may be some differences in the rate that the AOS housing comes up to temp, but that would be a few minutes of temperature difference between with and without coolant. I am thinking that the overall engine bay temps determine the AOS housing temp more than the collant.
Thanks for your question Adam. Well, I can tell you that I made the mistake of touching the bottom of the can when I was running the car to burp the coolant. And it was absolutely hot :-)
We don't have a Flir camera, but we may look into it.
Thanks for watching!
Thanks for the video! Just installed the IAG Comp. Noticeably less oil running through the inter-cooler
Thanks Erick, and good news! Keeping oil out of the intake path is definitely necessary on modern turbocharged cars :-)
I got the iag also do you have to do a tune after installing it?
Thanks for your question Brandon. If you got the street series, that doesn't require any custom tuning. If you got the Competition Series, which is an atmospheric dump, then that does require tuning to make sure that you are running properly.
Thanks for watching!
Would you recommend the radium aos over the iag street series for our ej205 motors ? I see the radium deletes the pcv while the iag retains the pcv valve,
Thanks for your question. I'd recommend you take a look at the AOS Buyers Guide that we did recently:
th-cam.com/video/OjoA2qXujMA/w-d-xo.html
You actually do want the PCV valve for street cars actually, and I'd recommend the IAG over the Radium actually.
www.flatironstuning.com/iag-v3-street-series-air-oil-separator-04-07-sti-06-07-wrx
Thanks for watching and Stay Tuned.
@@FlatironsTuning thank you
Great video. Are there any options for bugeyes that still retain the cruise control module?
Thanks for your question. Radium does now sell a cruise control bracket so you can keep your cruise control, and IAG has directions to modify the stock bracket to relocate the CC module so you can keep it as well.
It can definitely be done.
Hope that helps and thanks for watching!
Great content very informative subscribed!!!! Thank you!
Can a run an air oil separator while running e85
Hooking a boost gauge up to the crank case is brilliant! What did you find out? I am tempted to do this now as well.
Thanks for watching Josh. It is honestly really interesting. It moves much less than you would guess, but it is pretty eye opening. I'm not ready to make a video about what I are seeing, as I am trying to take a look at multiple cars to make sure that my understanding is as correct as possible. It is pretty convenient just being able to just move an oil cap around :-)
Stay tuned, but it will most likely be a few more weeks before I put something out about it.
If you are curious, you should definitely try it out.
Thanks again for watching, and stay tuned!
Hey Jon awesome video as always! Mate I might have missed the follow on from this, but did you find out how effective the IAG was at stopping oil going back into the intake and also did you find out what the composition of the "blow by" was that was being returned back into the oiling system? I know the report from the other video said that they wouldn't recommend this to be returned back into the oil system, curious if the stuff being returned by the IAG is in fact ok??
Thanks for your question. I'm not sure if we discussed that specifically. Basically, with the IAG AOS, as long as the drain is working well, the IAG should be able to remove pretty much all of the oil that would get to the intake track.
I hope that helps and Stay Tuned!
Which oil separator you recommend for a 2002 Wrx for street use only Thank you
I'm running speed density with the Crawford AOS with no PCV valve. If you are running speed density, you might as well run atmosphere.
I have the Grimmspeed AOS purely for street driving. I understand the drawbacks but would I benefit from moving the breather tube closer to the Turbo? Standard procedure is to connect it further down the inlet towards the air filter.
I've had some oil consuption issues with higher speed cruising back home (engine @4k rpm and over).. The PCV valve was sticking as well. Fixed that, now trying to optimise the rest of the system.
Thanks for your question. You could certainly try it. From what we have seen, there are issues with the internal design of the part as well, but it would not hurt to try a different configuration to see if you notice any improvement.
Hope that helps and Stay Tuned!
@@FlatironsTuning thanks for the advice and keep up the great videos! Very informative.
Great videos, so whats the verdict on the better A
I need help. I'm currently running a IAG AOS on my 16 wrx. I've had it on my car for almost a year. Never had a problem until now. I've noticed my idle is high when it's warmed up at 1500 rpm's. I checked if I had and vacuum leaks any exhaust leaks and everything checked out good. I decided to check the check valve/ pcv line pinched it a little with some clamps. This helped the idle to go down to normal. Do you think a bad pcv line is what is causing the idle to be high? Let me know please.
great video I have learned a lot thank you
Thanks for that, and thanks for watching!
Radium makes a cruise control relocation bracket for that car.
Thanks for that, and thanks for watching. We'll have to check that out.
I recently had my wrx tuned and have been looking to add an aos. I really like the radium design but seeing as it removes the factory pcv I’m a slightly worried about it affecting the tune. Did you guys end up doing a retune on the 2.0 to adjust for it or decide it couldn’t affect things too heavily?
Thanks for your question Frank. I believe you are talking about the PCV valve specifically? The Radium does remove that, but the PCV valve itself is only open when the manifold is under vacuum, so removing it will not effect the tune. There will be less gas movement when the throttle is closed, and worst case, that could cause more deposits in the case and valve covers long term, but it should have a minimal effect on a track car.
Hope that helps, and thanks for watching!
Great videos, so whats the verdict on the better AOS for Rrecirculating system, IAG or Radium
Thanks for your question rob. Stay tuned, we will be diving into that here soon.
Thanks for watching!
FlatironsTuning any updates on when you’ll upload the video? Thanks for sharing all your knowledge!
For a 2016 STI, do you have any experience with Grim speed AOS? is good the idea of returning the oil back to the oil system?
Thanks for your question. At this time, I can only recommend either the IAG or Radium kits at this time. My best recommendation would be to look at the video that we did about the function of the PCV system, and compare that to the install instructions of the Grimmspeed AOS, and decide if you feel comfortable with their routing, etc.
Hope that helps, and thanks for watching!
I have installed the grimmspeed AOS on my wrx
Hi grade video, I have a question, if I only have the plumbing from the covers to the crankcase and seal all other and eliminate the PVC in the hose of the PVC put a hose to oil catch can whit a baffled then another hose to a venturi. It works?
Thanks for your question. You could certainly try it, but from what you describe, it sounds like you would be limiting the crankcase's ability to release pressure.
My best advice would be to look at the stock routing, and make sure that even if you are significantly modifying it, that you retain the 2 1/2" ports that allow the crankcase to breath.
Hope that helps and Stay Tuned!
hey Jon my name is Michael Cooley. small world lol can a bad pcv valve after being replaced have residual symptoms left over from the oil build up in the cylinders?
Thanks for your question! If you did have a bad PCV valve, which lead to oil getting into the inlet, yes, that can leave behind an oil residue which will generally stick around until you thoroughly clean it up. The main points here would be the turbo inlet hose, and the intercooler.
I hope that helps and Stay Tuned!
Thanks for the great Subaru content, just found this channel a few weeks ago and have spent way too much time already going through all of your videos :)
Actually picked up a Radium Engineering AOS after seeing this video. Went to install it last night on a 2006 WRX and ran into a slight issue that I was hoping you might be able to shed some light on, having been through the install. The 3/4'' drain hose to the crankcase port on my setup (EJ25/TD05-20G/Silicone TIP/Process West TMIC) seems to have a slight uphill section no matter how I orient it. Did you run into this issue and, if so, were you able to resolve it?
Just FYI, my kit came with a 45 degree fitting for the bottom port; I was thinking that I could gain just a tiny bit of clearance by using a straight connector.
Glad that you found us and that the videos were helpful!
That is a tough one. We put a 90° adapter on the top of the block fitting of the block, and I think that helped with the drain angle.
It is definitely hard to do with a top-mount intercooler.
I hope that helps and Stay Tuned!
I have 2 questions for my 2011 stage 2 STi:
1) Would you suggest a catch can or AOS?
2) Which brand of above answer would you suggest? (Not concerned with cost)
Thanks for your question. That all depends on how much, if any, oil you are using between changes. If you are using minimal oil, then a catch can would be fine. I think that the Radium dual catch can is the best option there.
www.flatironstuning.com/radium-catch-can-kit-08-14-wrx-sti-15-sti
If you are using more oil than you feel comfortable holding in a catch-can, that is where the AOS comes in.
Curently, I'd recommend the IAG Street Series, or the Cobb AOS, or the Radium AOS:
www.flatironstuning.com/cobb-tuning-04-19-sti-06-14-wrx-aos
www.flatironstuning.com/radium-air-oil-separator-subaru
I hope that helps and Stay Tuned!
@@FlatironsTuning I was planning on going with the IAG AOS so this pretty much solidifies my decision.
Thanks for the reply!
I bought a Godspeed basic Catch Can. It has two ports. I am assuming it should go in between the line that goes back into the intake in a 1 can system? Is it worth it?
Thanks for the question Eric. My best advice is to keep one can per line when installing a catch can. Pick the line that you want to intercept, and run it to and from the can. I wouldn't recommend plumbing multiple lines to a single can. Hope that helps, and thanks for watching!
How exactly does the vent to atmosphere style AOS affect the tune? Working on installing a IAG unit in my car. Currently have a COBB Stage 1 tune. Will it be safe to run on that tune? At least temporarily until funds allow for the dyno tune.
Thanks for your question. The short answer is no. If you are going to install the IAG AOS with the atmospheric dump, you would need to be tuned for it. I would not say that it is safe to use it with an OTS tune, but if you have to drive to your tuner, you would just need to stay out of boost as much as possible.
Thanks for watching, and good luck with the install!
So I have an iag comp on my car and I'm about to do flex fuel and probably just gonna be hitting around 340-350hp. Are there any drawbacks besides shorter oil change intervals to keeping my aos atmospheric? Is it ok to keep it? Or should I just convert it to recirculating?
Thanks for your question. That is up to you. For street cars, we do recommend the IAG Street AOS. You can convert your Comp series to that if you like. For the power target you have, you should not need to vent the PCV to atmosphere.
I hope that helps and Stay Tuned!
Thanks for the info. I'm a complete beginner at this stuff so please forgive me if my question is dumb, but why doesn't Subaru install an AOS as a stock item and make it vent to atmosphere? Seems like that is the best solution (no oil intake and no spent exhaust intake). thanks.
Thanks for watching, and thanks for the question. Subaru does actually put in an AOS on the back of the block. We have a detail of it in our PCV Video, and I'll link to that below.
As far as not venting to atmosphere, that is because it is not allowed by the emissions requirements that are in place. For a vehicle to be street legal, all combustion gasses have to go through the catalytic converters and out the exhaust.
Here is a link to that PCV video that shows the factory AOS. That content starts around 4:20 in the video.
th-cam.com/video/mO9mxDUDUDc/w-d-xo.html
Thank you so much for the reply. As I was writing the question before I wondered if indeed there was already some type of AOS from factory, but in everything I have read I can't remember it being mentioned "a stock AOS". I will now proceed to watch the video you linked to. Thank you again :)
You got it. If you have any other questions, just let us know!
Wouldn't removing the PCV valve make it no longer emissions compliant because a component of the factory equipped emissions control system has been removed?
Thanks for your question. If you have a street car, and you want to make sure that you will still pass your emissions, I'd recommend getting clarification from them as far as how much you are allowed to adjust/move hoses, etc.
Thanks for watching and Stay Tuned!
Could you use this setup from your yellow WRX on an ej25? Even though the 25 has the extra plumbing going from the crankcase to both valve covers for equalization?
I have retained the factory "balance" ports between the crank case and valve covers, but have the other two valve cover ports and crankcase ports just venting straight out to atmosphere with breather filters, the PCV valve has been removed and has been blocked off. Could this setup cause smoke out of the exhaust? Is there a issue with this setup? Could this alter my MAF scaling as I am getting high amounts of negative correction, is this to be expected?
I plan to eventually route the lines to a catch can then have it vent to atmosphere.
Thanks for your question Booki. If you are simply venting to atmosphere, this should not cause any smoke through the exhaust. However, if you have routed the vents in such a way that prevents the crank case pressure from dissipating, or are using a restrictive filter media that does the same, this can cause pressure to build up in the case, and that in turn can prevent the turbo from draining, and that will cause smoke out of the exhaust.
I would recommend putting a gauge on the oil cap as we have done, and see if you are getting up into positive crank case pressures.
As far as the MAF scaling, yes this configuration would need to be tuned for. As we have discussed in previous videos, if you remove the connection between the inlet and the crank case, you must tune to account for the fact that you will not be pulling in a percentage of spent air from the crank case.
I hope that helps, and thanks for watching!
Thanks so much for the detailed response! I will try and check my crankcase pressures. Its interesting you mentioned the turbo not being able to drain corretly... I have had issues previously with a "wet" hotside on my turbo. I have just put on fresh cylinder heads though so will be keeping a eye on it.
Is there any long term issues with Vent to atmosphere if no smog tests in my country ?
Thanks for your question. There are no long term issues as long as you have a good filter on the vent. You wouldn't want to pull in any dust or debris.
And just keep in mind that you will have to tune the car for a vent-to-atmosphere system if it didn't come with that from the factory.
Thanks for watching!
In terms of running e85, I know it’s beneficial to have a recirculating AOS. But what about retaining or removing the factory PCV valve?
Thanks for your question Bill. Basically, if you are recirculating the AOS, then you want to have the PCV valve connected.
If you are venting the AOS or catch-can to atmosphere, then you must delete/remove the PCV valve.
I hope that helps, and thanks for watching!
I wanted to buy the IAG AOS for my car but i have a 2002 wrx .. All the kits are for 2004 and up .. Do u know if the kit for 2004-2007 works on the 2002?
Hi, I have a daily driver 2007 wrx and it burns about a quart of oil per oil change (~2500-3000 miles) and was wondering if this is fairly normal and if it was most likely in need of an aos (I was thinking the grimmspeed aos since its an easy install and fairly decent priced) or if i should look somewhere different. Thanks
Thanks for your question Brett. Going through a quart of oil is right on the higher side of what I would call normal. The first step, especially as your car is now 10+ years old, would be to go through the engine, and look for any signs of leaks, etc. And make that you aren't leaking out anything from the valve-covers, PCV system, etc.
The next step would be to remove your intercooler and look for signs of oil in the intercooler and at the throttle-body to get a sense of how much liquid oil may be going through your PCV (there will almost certainly be some there, but how much).
If everything is working properly, and there are no signs of leaks, etc., then you may want to consider an AOS or catch can.
Suffice it to say that ease of install would not be a good criteria for picking a solution. If you aren't going through oil quickly, and you aren't tracking the car, etc., then a good catch can may be a good solution for you. But you would certainly have to keep an eye on it. If you want an AOS, the two that we have ran are the Radium and IAG, and those would be the ones that we would recommend looking at.
I hope that helps, and thanks for watching!
Thanks for the feedback! The intercooler coupler slipped out from beneath one of the clamps (it was loose) and there was a decent amount of oil just sitting in the coupler so I'm assuming its time for an aos or catch can. Since I'm in college I'm trying to keep costs down a bit so i was wondering what to look for in a catch can to make sure it will catch most of the oil. Or should i just go with a good name brand one like Mishimoto or Cusco. Do I need a 2 or 3 port catch can? Thanks for all your help!
Thank you. Amazing vedio.
I have learned from you that the ej205 has only 2 lines coming out from valve covers, while the ej25 has 3 lines coming out. 2 from the valve covers. and 1 from the middle of the block.
Can I install an AOS that designed for Ej25 on ej205? (like iag aos comp)
Also is there any way that I install aos withot removing my front strut bar?
appreciated
thanks for your question. I would first recommend that you watch the video we did about the PCV system, so you have a solid understanding of what each group of hoses does before attaching an AOS. Here is a link to that:
th-cam.com/video/mO9mxDUDUDc/w-d-xo.html
The short answer is that yes, you can install an AOS onto your car, and properly route it. This is because the lines that the 2.0 liter has are the ones that are the functional part of the PCV system, and those are the ones that need to be addressed. The extra lines are just for balancing the pressure of the crank-case, so you would not send them to the AOS even if you had the 2.5 liter engine.
As far as keeping your strut bar, that is going to be quite difficult. Since they don't do much on a Subaru, I would say that the AOS would be much more important if you need one, but there is always a chance that you will be able to get everything to work together.
Hope that helps, and thanks for watching!
I have Alfa Romeo Gt jtd (diesel) . What can go wrong if I install atmospheric air oil seperator? It is a street car. I newer use this car on track.
Thanks for your question Sasa. Diesel's work completely differently than internal combustion engines, and I don't feel like I can adequately answer your question. It may be okay, but if your car is a modern diesel, it could still cause some issues.
I would recommend first looking for a company that makes a catch can or separator for your car, as they should have testing to make sure that it will work properly.
If one is not available, then I would recommend talking to a shop that specialized in working with your car and see what they recommend.
Sorry I can't give you more guidance than that.
Thanks for watching!
Does it mean that if an AOS is configured to vent to atmosphere it won't pass emissions test?
Most likely that is correct, now for a few reasons. The two main ones being the vent to atmosphere, and the tune required to get the car running properly as well in that state.
Thanks for watching and Stay Tuned!
So, the question is.
Is there enough vacuum in the inlet at closed throttle in order to create vacuum in the crankcase?
if there is enough vacuum, there is no point of running the PCV and this radium system will be the safest way to go
Thanks for your question. There isn't a vacuum at the turbo inlet when the throttle is closed, but because you are off throttle, the need to scavenge the crankcase is much less.
I believe that is why a number of AOS systems remove the PCV all together.
That being said, I do think that there are some advantages in keeping the PCV in place. Most of the time, this can be done quite easily with a small adjustment of the plumbing.
Hope that helps and Stay Tuned!
@@FlatironsTuning You are the best!
thanks a lot for all the info you provide !! :) :)
I also tried the oil filler cap vacuum monitoring and it is amazing to see the differences!
thanks again.
I would love to see a video on the GrimmSpeed AOS. This was always controversy on that specific system. It would be nice to finally have some good truth about it. The information I have come across say that the GS AOS is good for daily driven cars that don't see high boost and have light modification. I run the GS AOS is that exact application and I would say it does it job well. I haven't noticed any issues but again I am only one soul out of many. So it would awesome if you could do a review for us at some point i the future on the GS system and offer other recommendations for light hp cars. I am running it on a 2.0l wrx with an sti 6 speed, external wastegate and 565cc injectors ect. So simple put, its lightly modded. If you could tells us when it would be a good idea to upgrade to a better system. Like either a power level or based on modifications. Also thank you for helping me with the 6 Speed swap last year! Flatiron tuning is what the internet has been needing for a very very very long time.
Thanks for your question, and glad that we helped with your 6MT swap!
I will be honest and tell you that I don't think that we will do an in depth test of the GS AOS. I don't really want to take a hyper-focused look at a single manufacturer's solution, and test how well they have designed a part/solution. Rather, we are trying to go into more depth about how things work, and what to look for, etc., so that you have the information to make an informed decision.
And honestly, the same criteria for the OEM PCV system would pertain to the GS AOS as well. If you start to see oil consumption, and you can trace the flow of the oil back to the AOS itself, that would indicate that that system is not solving your problem sufficiently any longer, and you would want to look for a better set-up.
One of the tricky things about the function of the PCV system in general is that there are a ton of variables at play, and many conditions that come into how the system works. We are starting to get a sense of what is going on, but we are a long way from being able to say anything definitive. We are always collecting more information, and as soon as we can, we'll post it up.
Thanks again for watching, and thanks for your question! Don't hesitate to reach out if anything else comes up!
Honestly, I'd be very weary of the Grimmspeed AOS. It is built to drain into your oil filler cap. Well, what happens when your crankcase pressure rises? It can't drain and instead blows more into your intake (Theory). Search youtube and you'll find a review in which they added a catch can in the GS AOS return line and caught a bunch of oil during a track run.
Dude please do more Subaru fundamentals. My Subi grenaded 20 miles after me getting while I had cruise on doing 70mph I got a new shortblock but I scared to death to put parts from the old shortblock on it for fear of going through another engine. I can’t afford everything new so please help man more videos like these
Sorry to hear about your engine trouble. I'd recommend taking a look at this video, as it might be a help as well:
th-cam.com/video/St4WfvUh_88/w-d-xo.html
Thanks for watching and Stay Tuned!
Any reason why you would not put the vent to the exhaust with a 1 way valve?
Doing that isn't street legal. He specifically said they were going with the street version for emissions compliance.
Do you recommend running an AOS in a stock STI?
Thanks for your question. For a stock car that is street driven, you shouldn't need an AOS. At most, a catch can should be able to catch any blow-by that you are generating.
The best gauge of how much you need to work on your PCV system is how much oil you have to add between changes. If you don't need to add any, then you are having minimal movement through your PCV, so you don't really need to intervene that much.
I hope that helps, and Stay Tuned!
you do NOT need a tune if your venting to atmosphere. crank case pressure varies way to much between engine speed,temp, and just depending on the car like miles and how you drive it to be accounted for in the tune not to mention that air already isnt accounted for because its after the maf anyway
I have to say from our experience this is not correct. The change in fueling that you can see by removing the crank case gases can be enough to require a re-tune.
At an absolute minimum, I would say you would want to work with a tuner to closely monitor any changes that the ECU is seeing, and tune accordingly.
With something like this, you have to be very cautious because if even under curtain circumstances you are pushing the ECU beyond it's limit to correct for a change, you can cause damage to your engine.
Thanks for your comment, and thanks for watching!