Welcome to the North American Subaru Impreza Owners Club Thursday March 21, 2019
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.5L Turbo Powertrain (EJ Series Factory 2.5L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 02-13-2019, 08:12 PM   #1
defaultstivaper
Scooby Newbie
 
Member#: 486819
Join Date: Jun 2018
Location: Long Island, N.Y.
Vehicle:
2018 STI
Pure Red

Default 2019 STI engine vs. 2018 STI engine

As most of us know, the 2019s were updated with 5 more hp, stronger pistons, sodium filled valves, and a revised tune. At first I figured these updated EJ 257s would be less prone to issues, but the more I think about it that may not be the case.

Let's be realistic. Ringland failure is less and less common, especially with later model STIs. I'm not sure what was changed, but I haven't read about ringland failure in a while. The true issue is sensitive rod bearings that will eventually lead to rod knock.

So despite the 2019 STIs having strengthened pistons and updated valves, etc., does this really make them safe from the number one killer of EJ engines, being rod bearing failure? From what I can see the crankshaft and rods appear to be identical. Thoughts?

For a teardown of the 2018 Type RA / 2019 STI block and more details:

https://forums.nasioc.com/forums/sho....php?t=2877380
* Registered users of the site do not see these ads.
defaultstivaper is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 02-14-2019, 11:38 AM   #2
xX_STI_Xx
Scooby Newbie
 
Member#: 493470
Join Date: Nov 2018
Location: Chicago
Vehicle:
2019 STI
Crystal White Pearl

Default

Quote:
Originally Posted by defaultstivaper View Post
As most of us know, the 2019s were updated with 5 more hp, stronger pistons, sodium filled valves, and a revised tune. At first I figured these updated EJ 257s would be less prone to issues, but the more I think about it that may not be the case.

Let's be realistic. Ringland failure is less and less common, especially with later model STIs. I'm not sure what was changed, but I haven't read about ringland failure in a while. The true issue is sensitive rod bearings that will eventually lead to rod knock.

So despite the 2019 STIs having strengthened pistons and updated valves, etc., does this really make them safe from the number one killer of EJ engines, being rod bearing failure? From what I can see the crankshaft and rods appear to be identical. Thoughts?

For a teardown of the 2018 Type RA / 2019 STI block and more details:

https://forums.nasioc.com/forums/sho....php?t=2877380
I agree, I think the reason we are seeing less and less issues is because tunes have been getting better and better. People are starting to understand Subaru's ECU much better and coming close to perfecting the maps. With E85 really coming into the tuning scene in the past 5 years, people have been able to push the EJ's even further, safely.

As for strength of pistons, no matter how much additional material they put on a cast piston, the failure point will always be cast inconsistencies. Depending on how much Subaru charges for the S208 shortblock with fully forged components (pistons, rods, and crank) it might be a better alternative to (cost wise) to an IAG closed deck block or such. If it's only minimal price difference, then it won't make sense....might as well go IAG closed deck.
xX_STI_Xx is offline   Reply With Quote
Old 02-14-2019, 12:04 PM   #3
rtv900
Scooby Specialist
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

Quote:
Originally Posted by defaultstivaper View Post
does this really make them safe from the number one killer of EJ engines, being rod bearing failure?
the number one killer is actually owners ruining their engines
rtv900 is offline   Reply With Quote
Old 02-19-2019, 12:21 PM   #4
danger1138
Scooby Specialist
 
Member#: 279525
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: QUEENS NY
Vehicle:
06 Fxt

Default

Quote:
Originally Posted by rtv900 View Post
the number one killer is actually owners ruining their engines
Correct ^ . That along with those same owners flooring it in high gear low rpm situations.
danger1138 is offline   Reply With Quote
Old 02-19-2019, 12:24 PM   #5
rtv900
Scooby Specialist
 
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

Default

Quote:
Originally Posted by danger1138 View Post
Correct ^ . That along with those same owners flooring it in high gear low rpm situations.
OUCH!

welp, 78,000 miles and counting
I'll be sure to make an "EJ self destructed due to lugging" thread if mine ever dies. . .or even starts having issues
rtv900 is offline   Reply With Quote
Old 02-19-2019, 12:54 PM   #6
car_freak85
Scooby Specialist
 
Member#: 13530
Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
Vehicle:
EA63 , EA81T, EJ20G,
EJ205

Default

Quote:
Originally Posted by rtv900 View Post
OUCH!

welp, 78,000 miles and counting
I'll be sure to make an "EJ self destructed due to lugging" thread if mine ever dies. . .or even starts having issues
55k and counting on my lugged engine. I may try to lug it the entire way home today!
car_freak85 is offline   Reply With Quote
Old 02-19-2019, 03:42 PM   #7
frugalrhombus
Scooby Newbie
 
Member#: 494291
Join Date: Nov 2018
Location: Broward County, FL
Vehicle:
2019 STI
Dark Gray

Default

I have a 19 that I have at 357/411 to the wheels and I won't go any higher until I decide to build the motor. I can't remember if it is just 1 or if there are now 2 19s/RAs down by us that had a piston fail.

Which normally wouldn't be a big deal except that it wasn't the ringland that failed, the piston skirt cracked and ended up taking the head with it.

So we still don't know if that was a freak incident or the new norm.
frugalrhombus is offline   Reply With Quote
Old 02-19-2019, 09:59 PM   #8
danger1138
Scooby Specialist
 
Member#: 279525
Join Date: Apr 2011
Chapter/Region: Tri-State
Location: QUEENS NY
Vehicle:
06 Fxt

Default

Quote:
Originally Posted by car_freak85 View Post
55k and counting on my lugged engine. I may try to lug it the entire way home today!
Ok, keep it up
danger1138 is offline   Reply With Quote
Old 02-20-2019, 12:12 PM   #9
james-30
Scooby Newbie
 
Member#: 430450
Join Date: Sep 2015
Location: Indianapolis
Vehicle:
2019 STI
Lapis Blue

Default

Quote:
So we still don't know if that was a freak incident or the new norm.
I know several guys pushing 500+ whp on the (2019) new internals with zero issue. Now that kinda power you are dancing with rod failure but these guys are like me and do not daily their sti.
I'm currently building a (stock internal) 450+ whp 2019 sti. I baby my car and plan to continue babying it after its built.
james-30 is offline   Reply With Quote
Old 02-20-2019, 12:28 PM   #10
xX_STI_Xx
Scooby Newbie
 
Member#: 493470
Join Date: Nov 2018
Location: Chicago
Vehicle:
2019 STI
Crystal White Pearl

Default

Quote:
Originally Posted by james-30 View Post
I know several guys pushing 500+ whp on the (2019) new internals with zero issue. Now that kinda power you are dancing with rod failure but these guys are like me and do not daily their sti.
I'm currently building a (stock internal) 450+ whp 2019 sti. I baby my car and plan to continue babying it after its built.
James,

I'd like to find out more about your build on the 2019 please.

I am looking for 450whp on a non-daily as well since I am moving to AZ in the next few months and will have another daily.

Thanks.
xX_STI_Xx is offline   Reply With Quote
Old 02-20-2019, 03:03 PM   #11
car_freak85
Scooby Specialist
 
Member#: 13530
Join Date: Dec 2001
Chapter/Region: NWIC
Location: Cascadia
Vehicle:
EA63 , EA81T, EJ20G,
EJ205

Default

Quote:
Originally Posted by danger1138 View Post
Ok, keep it up
I have been, for the last 55k!
car_freak85 is offline   Reply With Quote
Old 02-20-2019, 03:21 PM   #12
frugalrhombus
Scooby Newbie
 
Member#: 494291
Join Date: Nov 2018
Location: Broward County, FL
Vehicle:
2019 STI
Dark Gray

Default

Quote:
Originally Posted by james-30 View Post
I know several guys pushing 500+ whp on the (2019) new internals with zero issue. Now that kinda power you are dancing with rod failure but these guys are like me and do not daily their sti.
I'm currently building a (stock internal) 450+ whp 2019 sti. I baby my car and plan to continue babying it after its built.
I too would like to hear about that build. We can compare notes. From what I've seen, I think I'm ore or less maxed on power without going to FMIC. Well I could still do TGV deletes and fuel rail but I heard that the little bit of power you get isn't worth the labor hours.
frugalrhombus is offline   Reply With Quote
Old 02-20-2019, 03:32 PM   #13
james-30
Scooby Newbie
 
Member#: 430450
Join Date: Sep 2015
Location: Indianapolis
Vehicle:
2019 STI
Lapis Blue

Default

Quote:
James,

I'd like to find out more about your build on the 2019 please.

I am looking for 450whp on a non-daily as well since I am moving to AZ in the next few months and will have another daily.

Thanks.
I have a build thread going if you want to check it out. Titled "2019 build"
My list of mods is rather long and has been twice expensive as to what I planed for. This is my first sti. I have always read how expensive the EJ257 was to mod but never would i have guessed this expensive. Keep in mind I haven't cut any corners, I'm buying only the best of the best parts. but anyway check out my thread.

Quote:
I too would like to hear about that build. We can compare notes. From what I've seen, I think I'm ore or less maxed on power without going to FMIC. Well I could still do TGV deletes and fuel rail but I heard that the little bit of power you get isn't worth the labor hours
I went with a Grimmspeed top mount. Again ive seen high 4' to low 5's whp with a good quality top mount. Over build your fuel system. Fuel, fuel,fuel. that's just my opinion though.

Last edited by james-30; 02-20-2019 at 03:38 PM.
james-30 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -4. The time now is 05:24 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2019 Axivo Inc.
Copyright ©1999 - 2017, North American Subaru Impreza Owners Club, Inc.