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10-02-2022, 11:40 AM | #1 |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
First Reliability Mod
I wanted to gauge the forum’s opinions/thoughts on a worthwhile reliability mod they would do on their STI.
The car is a 2019 STI that has no modifications on it, and I’ll be slowly saving up to put more parts on it (AKA: being divorced is a PITA.) I have both of the following parts: IAG Street AOS GDT Cylinder 4 Cooling Mod Thoughts? Opinions? Anything that you would recommend in lieu of?
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10-02-2022, 12:05 PM | #2 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
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10-02-2022, 12:14 PM | #3 |
Scooby Specialist
Member#: 519868
Join Date: Nov 2020
Location: Chicago
Vehicle:2010 Impreza WRX Satin White Pearl |
Where are you located. Read up on the downsides of an AOS in cold climates. Can be catastrophic.
People are split on the Cyl 4 Cooling Mod. I have it on mine. Equal length headers would reduce the stress on that cylinder as well. |
10-02-2022, 01:05 PM | #4 | |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
Quote:
@a5m: I'm in NJ across the water from Philly. It's cold, but nothing like North Dakota cold, and that's just pure hell. Future Plans: End goals for this build are to keep things simple, nothing too strenuous since it is my daily. Downpipe EBCS Fueling (pump, injectors, etc) ELH |
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10-02-2022, 05:52 PM | #5 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
Our SOP for a mostly stock car looking to maximize reliability, is Oil Pickup, AOS, Cyl-4 Cooling mod, EL Headers, Oil Temp Gauge, and Pro-Tune.
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10-02-2022, 06:48 PM | #6 |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
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10-02-2022, 08:03 PM | #7 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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Intercooler, E85 kit.
Or pistons. |
10-02-2022, 08:14 PM | #8 |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
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10-02-2022, 08:27 PM | #9 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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First reliability mod, many many many more ej dead from broken pistons and detonation than anything. AOS is not only a waste of money it is not a reliability mod, especially a first one.
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10-02-2022, 09:17 PM | #10 |
Scooby Specialist
Member#: 361325
Join Date: Jul 2013
Chapter/Region:
E. Canada
Location: Ontario
Vehicle:2010 STi Dark Gray Metallic |
My 2¢: Pull the pistons and open the ring gaps to 0.018" on the top and 0.024" for the 2nd compression ring. If you plan on upgrading the turbo (e.g.) consider switching to forged pistons then too.
Change to a Killer B oil pickup and run Rotella 5W40 or Amsoil 5W30. Change the oil relatively frequently and use OE Subaru oil filters. Check the oil level every time you fill up. |
10-02-2022, 09:17 PM | #11 |
Scooby Specialist
Member#: 361325
Join Date: Jul 2013
Chapter/Region:
E. Canada
Location: Ontario
Vehicle:2010 STi Dark Gray Metallic |
<double post>
Last edited by Blackfin; 10-02-2022 at 09:37 PM. Reason: Double post |
10-02-2022, 10:05 PM | #12 | ||
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
I've seen some sludge but nothing actually problematic. Your engine gets well above water's boiling point when warmed up, and that emulsion evaporates in your oil pan before it touches your bearings. Quote:
Please do some research on the stock VA TMIC and tube and fin vs bar and plate in general before attempting to educate others. And saying an AOS doesn't aid in engine reliability generally is somewhat laughable |
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10-02-2022, 10:18 PM | #13 |
Scooby Specialist
Member#: 515308
Join Date: Jun 2020
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Yeah, all the reliability of a long hose. I don’t see any reliability dumping that garbage back into the oil pan or intake. And I have had enough of the intercooler and one more to get rid of to know his iat drift up in boost and heat soaks and is great for packaging but little else even in stock form.
So what’s the known weak link in his unknown setup? Pistons that will break, eat up his oil and kill his fun and an intercooler that dosnt live up to its name to me. Only thing I can see in that list is the pick up, tho I have never seen a cracked one myself. |
10-02-2022, 10:32 PM | #14 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
Didnt Killer B already school you in another thread on how venting entirely to atmosphere does NOT achieve the same benefits for your engine as a properly setup AOS or catch can setup? Yet you keep repeating it. Edit, here it is: https://forums.nasioc.com/forums/sho....php?t=2942457 If that is your conclusion about the VA OEM STi TMIC, it's clear you've never used it. I advise you to test one out before spouting more misinfo - It is not the same as the GD or GR TMIC. The TMIC is NOT the weak link in this setup - and the bar and plate replacements everyone suggests heat soak considerably more than the tube and fin OEM designs. |
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10-03-2022, 06:48 AM | #15 |
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
We typically do all of those at once. I I were to pick one first and why, it would be the cyl-4 cooling mod. A well-designed AOS certainly can improve reliability, but it's over the long term. The cyl-4 cooling mod, you see benefit from immediately.
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10-03-2022, 07:06 AM | #16 | ||||
NASIOC Vendor
Member#: 198281
Join Date: Dec 2008
Chapter/Region:
MAIC
Location: Virginia
Vehicle:2005 WRX/STi WRB of course |
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Few have seen them break in the wild, but there are pics out there. We have well over 50 customer supplied pics, and stopped saving them ~10 years ago, because what we have seems like more than enough to make the point. How many actually fail, few. If I had to guess, based on how many cars are produced, feedback from Subaru, shops, and customers, I would say it's in the 1-2% range. It's really low, but one of my customers said it best. "Failure of the oil pickup is small and insignificant, until it happens to me." |
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10-03-2022, 08:01 AM | #17 | |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
Quote:
I think the cooling mod I would agree with in terms of instant benefits. Since my engine is a 2019 with the Type RA internals, do you feel that would still be the case, simply because the design of the block/heads itself isn't changed? |
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10-03-2022, 08:05 AM | #18 | |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
Quote:
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10-03-2022, 10:35 AM | #19 | |
Scooby Specialist
Member#: 519868
Join Date: Nov 2020
Location: Chicago
Vehicle:2010 Impreza WRX Satin White Pearl |
Quote:
Just an FYI, just replaced the pick-up on my 2010 WRX with ~130k and it was completely intact. Kinda felt like a waste of time. But I was installing the baffle too so now I have the peace of mind. For me it was worth it. |
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10-03-2022, 10:44 AM | #20 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Those PCV lines can freeze with or without an AOS - hence why FSM considers those PCV hoses a wear item and suggests frequent inspections, especially in colder climates.
The benefits of an AOS will always outweigh the potential drawbacks associated with using one in cold weather if you install it correctly. The OP in that post also was not insulating his drain line - which is best practice when installing an AOS in colder climates. Quote:
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10-03-2022, 10:49 AM | #21 | |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
Quote:
If we're talking New England region (Vermont, Maine,), as well as the Northern States (WI, ND, SD, etc) then I can see the insulation being crucial. |
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10-03-2022, 10:51 AM | #22 |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
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10-03-2022, 11:35 AM | #23 | |
Scooby Specialist
Member#: 508105
Join Date: Nov 2019
Chapter/Region:
NWIC
Location: Greater Seattle Area
Vehicle:Link G4X flex tuned 02' EJ205 20G 6MT wagon |
Quote:
Lots of places get VERY cold - even more so now with the climates changing. Better safe than frozen. |
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10-03-2022, 11:44 AM | #24 |
Scooby Newbie
Member#: 511379
Join Date: Feb 2020
Location: Philadelphia
Vehicle:2019 WRX Dark Grey Metallic |
Fair.
I'll read the forums on the insulation, shouldn't be too hard to put on I'd wager. |
10-03-2022, 11:47 AM | #25 | ||||
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
Because it increases reliability to put an upgraded radiator in a car that has a 1000% adequate radiator and will not overheat under any real world driving conditions. That way you can rest easy knowing you have even more cooling capacity that won't be needed or used. . . . .ever Quote:
EL headers won't do crap for any actual stress "on that cylinder" Quote:
basically swap out tons of parts that have a 0.0001% chance of failing, or the same potential failure rate of whatever you swap them with And Pro tune? Sheesh. Yeah, pay someone to put your car on a dyno, slam the redline 40 times and make a more aggressive tune. Quote:
Guy has a stock vehicle that will be totally fine if not screwed with, and you are honestly recommending he disassemble the motor to change ring gaps and potentially replace pistons as well. "reliability mod" is an oxymoron there's no such thing NOT modding out parts is the definition of maintaining reliability, that's what you bought. A complete vehicle designed 100% compatible and tuned conservatively to NOT fail unless outright flogged and beat to hell. . . . . . or modded out of course and tuned to death. All the responses in this thread would make perfect sense if the title was changed to: "What mods should I do just for the sake of modding something" |
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