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Old 07-01-2018, 04:17 AM   #76
EBeland17
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Join Date: Jun 2018
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I drive a 17 WRX and i have heard a lot about the carbon buildup, I brought it in for service (top engine cleaning) at around 16k before seeing any problems. Sadly that caused the problems i was trying to avoid (jumpy idle, running rough) but that eventually cleared up after having them reset the idle. It's at 24k now and I don't see anything going wrong yet, but i often worry about the rediculous amount of buildup that i have to clean from the muffler tips just on a weekly basis. I have an AOS from Crawford (not installed, heard mixed reviews) and I'm interested in looking into the EGR deletes. I'm curious, I thought that was an emissions controlling device, wouldn't that be illegal to remove? (Possibly fail inspection later on). I bought this car over the STI thinking i would try out the newer technology, but now i see it's quite a hassle just to maintain these things.
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Old 08-29-2018, 11:42 AM   #77
M0S3S
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Member#: 459977
Join Date: Dec 2016
Location: Twin Cities
Vehicle:
2019 WRX STI Limited
Lapis Blue

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Almost 32,000 miles on my 17 WRX. Never cleaned them once. I'll have to get before and after pics.
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Old 09-07-2018, 09:39 AM   #78
SirBrass
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Join Date: Apr 2009
Chapter/Region: MWSOC
Location: Indianapolis area
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2019 WRX Limited
World Rally Blue

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If I don't want to go the tgv/egr delete route, how much of a benefit would just an AOS + protune be? Or is the best "longer times between walnut blasting" solution be the deletes & tune + AOS?
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Old 09-30-2018, 01:47 AM   #79
prodigy2k7
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Noob Question:
Why do you actually have to "delete" the EGR? Why not just unplug it and leave it installed?
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Old 03-11-2019, 10:38 AM   #80
Kahres05
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Join Date: Nov 2006
Chapter/Region: Tri-State
Vehicle:
2005 &2019 WRX
2017 MX5-RF-LE

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I know walnut blast is a sure way of making your valves like new again but here is an alternative I stumbled across. Kit looks top notch and sure it's more than the subaru one.

https://www.bgprod.com/catalog/gasol.../#bg-product-2

https://www.bgprod.com/services/gaso...ystem-service/

https://www.bgprod.com/reference/platref/

https://www.bgprod.com/reference/sub...turbo-engines/

https://www.bgprod.com/reference/sub...engines-video/
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Old 03-14-2019, 02:31 PM   #81
FRIED WONTON
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Chapter/Region: South East
Location: WPB, FL
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2016 WRX base
Grey

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Quote:
Originally Posted by Kahres05 View Post
I know walnut blast is a sure way of making your valves like new again but here is an alternative I stumbled across. Kit looks top notch and sure it's more than the subaru one.

https://www.bgprod.com/catalog/gasol.../#bg-product-2

https://www.bgprod.com/services/gaso...ystem-service/

https://www.bgprod.com/reference/platref/

https://www.bgprod.com/reference/sub...turbo-engines/

https://www.bgprod.com/reference/sub...engines-video/
BUMP!... has anyone tried this approach on cleaning the valves??? I just spoke with a shop locally (found via bgprod.com) and the advisor said it cleans like walnut blasting but difference is the "chemicals" used.
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Old 03-25-2019, 09:04 PM   #82
jmfXCII
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I'm at 40Km waaay passed that 14k miles. Looking for a place to get a walnut blasting done on my car
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Old 04-01-2019, 06:21 PM   #83
ToastyWRX
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Join Date: Feb 2018
Chapter/Region: RMIC
Location: Sandy, UT
Vehicle:
2015 WRX Stage2+
Silver

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Just got mine done at 62k. 55k miles were stock. 7k miles were "Stage 2" with EGR/TGV deletes. Spark plugs were replaced at the same time. Combined, the car seems to idle and cruise a little quieter/smoother. No huge differences I can tell from daily driving. Pics are attached, may be waiting approval or something


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Old 09-18-2019, 01:03 PM   #84
bizzlezx10r
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Member#: 439586
Join Date: Feb 2016
Chapter/Region: MWSOC
Location: Omaha, NE
Vehicle:
2015 WRX
ISM

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Dumb question but would walnut blasting help the amount of carbon i see in my exhaust tips? They were pretty much black a month ago and i cleaned them and polished them but they're looking black again and i have new spots of carbon on my garage floor right behind my exhaust.

My AF Learning 1 also showed a -25.6 or something along those lines yesterday so maybe i'm running rich?

2015 WRX
43k Miles
Cobb Stage 1 91 Octane tune & Factory SPT Exhaust. Other than that, completely stock.

Last edited by bizzlezx10r; 09-18-2019 at 01:30 PM.
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Old 09-18-2019, 05:31 PM   #85
7carisfast
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2015 WRX
Blue

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Walnut blasting is used to clean the backside of the intake valves, getting the airflow back to as originally designed. Nothing to do with carbon on exhaust tips.
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Old 09-18-2019, 05:33 PM   #86
7carisfast
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2015 WRX
Blue

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Does anyone have a TGV delete that could measure the length and width of each cylinder? I'd like to make up a jig ahead of time
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Old 09-18-2019, 05:37 PM   #87
bizzlezx10r
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Location: Omaha, NE
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2015 WRX
ISM

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Quote:
Originally Posted by 7carisfast View Post
Walnut blasting is used to clean the backside of the intake valves, getting the airflow back to as originally designed. Nothing to do with carbon on exhaust tips.
Thanks man, i was thinking there was so much carbon in my intake valves that it was almost "carrying over" to the back side of my exhaust.
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