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Old 12-03-2015, 11:15 AM   #26
2015WRX
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Any downfall regarding removing the EGR? I'd love to do this mod but feel that it's a little controversial. Do you gain any power at all or is it just a pure keep things clean mod?
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Old 12-03-2015, 11:18 AM   #27
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Any downfall regarding removing the EGR? I'd love to do this mod but feel that it's a little controversial. Do you gain any power at all or is it just a pure keep things clean mod?
Well you arguably retain power you would otherwise lose due to carbon build up. So yeah I'd say you "gain" power, if your car is anything but brand new.
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Old 12-03-2015, 11:26 AM   #28
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It will also help keep your manifold intake temps down which is good, because cooler air helps with power and will help eliminate any predetonation. During the summer I could see when they EGR was release back into the manifold because temps would increase 30+F. I think some people have even stated it helped with cruise knock.
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Old 12-03-2015, 06:18 PM   #29
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Any downfall regarding removing the EGR? I'd love to do this mod but feel that it's a little controversial. Do you gain any power at all or is it just a pure keep things clean mod?
The EGR is purely an emissions device.

The downsides to deleting it are:
- any legal/emissions ramifications
- you need to disable error codes on the ecu
- potential for impacting a Subaru warranty claim

There are no technical downsides to removing the EGR.
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Old 12-03-2015, 06:31 PM   #30
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Any downfall regarding removing the EGR? I'd love to do this mod but feel that it's a little controversial. Do you gain any power at all or is it just a pure keep things clean mod?
Probably slight effect on MPG. Also may be illegal in your state.

It's not something I would do if you plan to sell or your car relatively soon or leasing it.
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Old 12-03-2015, 07:09 PM   #31
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Default How to make j00 valves happy AKA great and sage DIT motor advice

Terra Clean appears to be a bit more involved than just spraying something in your intake.

http://www.terraclean.net

Specifically:
http://terraclean.net/product.php?id=54
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Old 12-03-2015, 07:46 PM   #32
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Terra Clean appears to be a bit more involved than just spraying something in your intake.

http://www.terraclean.net

Specifically:
http://terraclean.net/product.php?id=54
Yup sorry I didnt see the 'Download more information' link. Yeah it requires removing the intake manifold.

So its in direct competition with the walnut blasting as far as effort goes. Interesting to see which works better.
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Old 12-17-2015, 06:22 PM   #33
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I emailed SOA and asked if a valve cleaning service would be offered in the future and this was the response.

Hello J :

Thank you for taking the time to contact Subaru of America, Inc. and congratulations on the purchase of your 2016 WRX Premium Sedan.

As long as you take care of your routine maintenance, you will not get carbon buildup on the valves. Older direct injection systems that experienced carbon build up were so called “lean burn” systems. Unfortunately these systems suffered many times from uneven combustion due to variations in the fuel and air mixture throughout the combustion chamber. This created a mix of lean and rich conditions resulting in variations in combustion temperature and uneven burning of the gasoline. This uneven burning lead to the condensing of unburned and partially burned hydrocarbons which over time resulted in carbon buildup.

Subaru engineers understood this when they created our current direct injection system. They developed innovative yet simple systems to manage and control the combustion variations inside the combustion chamber. These include features such as specially shaped piston crowns, multi-patterned injection spray, and tumble generator valves. All of which promote the precise swirling and intermix of fuel and air under the variable conditions required across the full range of power requirements. When combined with very high fuel pressures and extremely short injection duration of the Subaru direct injection system, stoichiometric combustion is maintained across the combustion chamber resulting in very even and complete burning. As a result abnormal residue and carbon deposits are not created and engine performance and fuel economy are maximized.

Thank you, J, for the opportunity to be of service. Happy Holidays.

Sincerely,

John J. Mergen
Subaru of America, Inc.
Customer/Dealer Services Department
1-800-SUBARU3 (1-800-782-2783)
Service Request Number: 1-12875529303

I don't think they want to admit an issue exists yet.
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Old 12-17-2015, 06:34 PM   #34
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Has anyone tried krank case vents for this issue. In the past, coming from the F20 on a S2000 blow by was a huge issue. I am not all that familiar with the DIT so didn't know if these would help or not.
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Old 12-17-2015, 06:48 PM   #35
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Venting the pcv might be an option. Seems like most run a catch can. It looks like the egr has a lot to do with coating valves as well.
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Old 12-20-2015, 02:40 AM   #36
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I listened to Big Ron. @ 14,000 miles
http://forums.nasioc.com/forums/show....php?t=2764797




Last edited by ArmyOfSkittles; 12-20-2015 at 03:05 AM.
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Old 12-20-2015, 02:39 PM   #37
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Old 12-20-2015, 03:17 PM   #38
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^^ good call sir how much does walnut blasting cost and where can i get this done at? Im in south tx.
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Old 12-20-2015, 03:19 PM   #39
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armyofskittles your ride looking sweet. .that is one of my goals right there mane.
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Old 12-20-2015, 03:59 PM   #40
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^^ good call sir how much does walnut blasting cost and where can i get this done at? Im in south tx.
At the moment, the only shop I know of that is doing it is All Aspects in VA. Though I did ask BrenTuning and they said it was in their future as well.

AA charges 450 for the service.
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Old 12-21-2015, 01:39 AM   #41
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armyofskittles your ride looking sweet. .that is one of my goals right there mane.
Thanks
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Old 12-21-2015, 08:50 AM   #42
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^^ good call sir how much does walnut blasting cost and where can i get this done at? Im in south tx.
I would call around. Walnut Blasting isn't a new thing. Check the BMW forums as those guys are familiar with this process.
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Old 12-21-2015, 01:26 PM   #43
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At the moment, the only shop I know of that is doing it is All Aspects in VA. Though I did ask BrenTuning and they said it was in their future as well.

AA charges 450 for the service.
Thank you I want to get this done along with other mods at same time. Just hope someone here in tx does this service soon
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Old 12-21-2015, 01:30 PM   #44
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I would call around. Walnut Blasting isn't a new thing. Check the BMW forums as those guys are familiar with this process.
ill ask the bmw shops here in town also need to have someone who know what they are doing so I can get all mod upgrades done while getting valves blasted I have 13000 miles as of today had car for 1year and 1 month and half.
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Old 12-21-2015, 04:06 PM   #45
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I'm not trying to be cheap, but $450 every year for walnut blasting is ridiculous on an economy car with a turbo.
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Old 12-21-2015, 04:12 PM   #46
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Why would you do it every year?

You do it once you install the preventative mods, then you don't worry about it anymore.

EGR Delete/EOS/Meth will surely help eliminate the buildup. The EGR delete itself is probably a huge step in removing a lot of the build up. I had mine done at 45k and they didn't look any worse then the ones at 14k. That was before EGR/meth installation. I will take a look at them again once I put around 15k miles on the car. I've only done around 2k since the cleaning.
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Old 12-21-2015, 04:24 PM   #47
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Why would you do it every year?

You do it once you install the preventative mods, then you don't worry about it anymore.

EGR Delete/EOS/Meth will surely help eliminate the buildup. The EGR delete itself is probably a huge step in removing a lot of the build up. I had mine done at 45k and they didn't look any worse then the ones at 14k. That was before EGR/meth installation. I will take a look at them again once I put around 15k miles on the car. I've only done around 2k since the cleaning.
Well if you plan to stay stock, then you will have dirty valves like that last example at 14k. Most people put around 12-15k per year. If someone doesn't want to spend 2k in mods to stop it from happening, how do you not need it annually?
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Old 12-21-2015, 04:33 PM   #48
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I used to own a 2008 Cobalt SS, which is a Direct-Injected motor. We found that walnut blasting and then adding a quality AOS was key to reducing/preventing this buildup.

Seafoam did nothing to help clean this.
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Old 12-21-2015, 04:43 PM   #49
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Well if you plan to stay stock, then you will have dirty valves like that last example at 14k. Most people put around 12-15k per year. If someone doesn't want to spend 2k in mods to stop it from happening, how do you not need it annually?
You don't "need" to do it. It's a recommended maintenance (not by Subaru), not required. As stated, I drove to 45k miles on mine before doing it and my car ran perfectly fine before cleaning them. I think the picture of my valves are somewhere in this thread too. I just had them cleaned since I was doing the meth package as well. I think for nit picky people and people who like to mod, it's worth doing for ease of mind but I wouldn't recommend doing them at 14k, or every 14k that would be stupid honestly. As seeing what mine looked like, I'd probably recommend doing them at 40k. $450 every 40k miles isn't expensive for preventive maintenance. I don't think we have enough high mileage FA20DIT's to truly see the impact and long term effect on the valves yet.
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Old 12-21-2015, 05:51 PM   #50
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Originally Posted by Waddlz View Post
I used to own a 2008 Cobalt SS, which is a Direct-Injected motor. We found that walnut blasting and then adding a quality AOS was key to reducing/preventing this buildup.

Seafoam did nothing to help clean this.
So far the theory for these seems to be walnut blast and delete the EGR. AOS may help, but its debatable.
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