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Old 05-11-2019, 09:20 PM   #1
archer1.8
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Default 2018 STi Type RA #454 Members Journal

2018 STi Type RA #454

Picked up my 5th Subaru, and 1st STi on May 9th, 2019 with 7,000 miles.

Plan to do a bunch of Autocross and Track Days in the coming weeks. Plan to keep it stock power wise, but I do have some suspension upgrades I am looking to add.






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Old 05-11-2019, 09:21 PM   #2
Kostamojen
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What are your suspension plans?

Trying to decide what I want to do with mine...
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Old 05-11-2019, 10:06 PM   #3
archer1.8
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I want to keep this car as OEM+ as possible. I plan to basically go with all of the STi performance parts and JDM parts I can get. A lot of S208/s209 parts.

I have been approached by a few other Subaru enthusiasts since I got the car and everyone treats this thing like royalty. I feel like adding afermarket parts would make it not so special.

However, this thing needs a rear swaybar bad
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Old 05-11-2019, 10:46 PM   #4
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Quote:
Originally Posted by archer1.8 View Post
I want to keep this car as OEM+ as possible. I plan to basically go with all of the STi performance parts and JDM parts I can get. A lot of S208/s209 parts.

I have been approached by a few other Subaru enthusiasts since I got the car and everyone treats this thing like royalty. I feel like adding afermarket parts would make it not so special.

However, this thing needs a rear swaybar bad
My basically stock engine failed at 15,800 miles. You might be surprised at how early you join the "after market club". That said, I hope your car runs strong for years to come. I feel like mine was a bit of a lemon.
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Old 05-11-2019, 11:47 PM   #5
archer1.8
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Quote:
Originally Posted by GravyRobber View Post
My basically stock engine failed at 15,800 miles. You might be surprised at how early you join the "after market club". That said, I hope your car runs strong for years to come. I feel like mine was a bit of a lemon.
What was the cause of failure
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Old 05-12-2019, 09:28 AM   #6
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What was the cause of failure
Initially looks like ringland failure. However looking at the old block, there are a few hot spots on the crank which tell me a bearing or 2 were on their way to failure as well.
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Old 05-12-2019, 10:05 AM   #7
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Quote:
Originally Posted by GravyRobber View Post
My basically stock engine failed at 15,800 miles. You might be surprised at how early you join the "after market club". That said, I hope your car runs strong for years to come. I feel like mine was a bit of a lemon.
Keep in mind the RA and 2019+ STi has a different SB assembly compared to your 2017. I know it's too early to give any conclusive 'result' but I don't believe there have been any ringland issues with the new part numbers used.


The RA and 2019+ also has a different knock sensor and knock detection strategy. Comparing stage 1 2017 vs stage 1 2019 (same as 2018 RA) you do see the newer engine making more power too. There are just a lot of little changes that were made for the RA and 2019 that I think add up to a bit better reliability and power. Take it for what it's worth; my speculation based on observations and no long term data. Conversely, the RA and 2019 STi seem to be running out of fuel sooner. So you can't make as much power once you start down the mod list with stock fueling. Difference aren't huge, but they are there.
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Old 05-12-2019, 10:39 AM   #8
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Originally Posted by GravyRobber View Post
Initially looks like ringland failure. However looking at the old block, there are a few hot spots on the crank which tell me a bearing or 2 were on their way to failure as well.
Were you completely stock or tuned?
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Old 05-12-2019, 11:06 AM   #9
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Originally Posted by KillerBMotorsport View Post
Keep in mind the RA and 2019+ STi has a different SB assembly compared to your 2017. I know it's too early to give any conclusive 'result' but I don't believe there have been any ringland issues with the new part numbers used.


The RA and 2019+ also has a different knock sensor and knock detection strategy. Comparing stage 1 2017 vs stage 1 2019 (same as 2018 RA) you do see the newer engine making more power too. There are just a lot of little changes that were made for the RA and 2019 that I think add up to a bit better reliability and power. Take it for what it's worth; my speculation based on observations and no long term data. Conversely, the RA and 2019 STi seem to be running out of fuel sooner. So you can't make as much power once you start down the mod list with stock fueling. Difference aren't huge, but they are there.
That's interesting for sure. I sure hope stock cars can be more reliable than mine and many others were. Not trying to deter the OP from enjoying his car at all, just wanted to share my experience as my goals with my car were basically the same.

Quote:
Originally Posted by ayau View Post
Were you completely stock or tuned?
Not completely stock, just lightly modded for reliability. Or so I thought. AOS, stumble fix, downpipe with an e-tune from Torqued Performance. Car isn't my DD so very low mileage, and not abused. Rarely even took it out of "i" mode, which on my tune, was just wastegate boost. Ran Motul 5W-40 since the first oil change and changed every 3,000 miles. Basically I took every precaution I knew to keep it reliable. Failure became evident after running errands all afternoon under just normal driving conditions. No crazy pulls or launches or anything.

Sorry, OP, didn't mean to hijack your thread. Congrats on the car! It's beautiful and I hope you enjoy it for years to come.
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Old 05-12-2019, 11:56 AM   #10
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Quote:
Originally Posted by archer1.8 View Post
I want to keep this car as OEM+ as possible. I plan to basically go with all of the STi performance parts and JDM parts I can get. A lot of S208/s209 parts.

I have been approached by a few other Subaru enthusiasts since I got the car and everyone treats this thing like royalty. I feel like adding afermarket parts would make it not so special.

However, this thing needs a rear swaybar bad
Solid plan!

And don't worry about the failures of "lightly modified for reliabilty" 2017s...
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Old 05-12-2019, 01:03 PM   #11
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Originally Posted by F1EA View Post
Solid plan!

And don't worry about the failures of "lightly modified for reliabilty" 2017s...
Sorry for pseudo venting in this thread. Only reason I commented was because I bought my car with the exact same "OEM+" intentions as OP. I'm pretty sure I'm in the unlucky minority that have had freak failures like mine. My last Subaru was a stock block WRX that I beat the heck out of and it took it like a champ. Still trying to figure out exactly what failed and how with my STi. Oh well, the joy of Subaru ownership
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Old 05-12-2019, 01:05 PM   #12
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Quote:
Originally Posted by KillerBMotorsport View Post
Keep in mind the RA and 2019+ STi has a different SB assembly compared to your 2017.
Ya, I haven't heard of any Type-RA's having major engine failures yet... Not a huge sample size, but even 2019s with the same block seem to be holding up better as well.


Travis at Snail Performance tunes mine right away though because in California we have 91 octane and the tune for the RA was setup for 93. The stock map doesn't like 91, so the tune I had was for saftey. Also did an IAG AOS right away for saftey as well.
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Old 05-12-2019, 01:08 PM   #13
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Quote:
Originally Posted by archer1.8 View Post
I want to keep this car as OEM+ as possible. I plan to basically go with all of the STi performance parts and JDM parts I can get. A lot of S208/s209 parts.

I have been approached by a few other Subaru enthusiasts since I got the car and everyone treats this thing like royalty. I feel like adding afermarket parts would make it not so special.

However, this thing needs a rear swaybar bad
I'm kind of thinking the same with mine too, mayne just run some JDM pink springs and some of the draw siffeners and bushings and such. I can't find the spring rates for the springs though.

I haven't found this car needs a rear swaybar yet after autoxing it a few times. It rotates well enough, but I think sticky RE71rs helped a lot with that.
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Old 05-12-2019, 02:57 PM   #14
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Quote:
Originally Posted by GravyRobber View Post
Sorry for pseudo venting in this thread. Only reason I commented was because I bought my car with the exact same "OEM+" intentions as OP. I'm pretty sure I'm in the unlucky minority that have had freak failures like mine. My last Subaru was a stock block WRX that I beat the heck out of and it took it like a champ. Still trying to figure out exactly what failed and how with my STi. Oh well, the joy of Subaru ownership
Haha yeah a lot of people start with those intentions; but that's the game. Modifying can be really fun, but also heart breaking. In the end, you modified the car and it went out. And the modifications were kind of serious. Not extreme, but... more than just some innocuous little bits. Pay to play.

I'd do the same if I had an RA. Mostly stock (maybe catback, suspension and wheels, etc), that's how they'll keep their value and appeal... unless you don't care about any of that, then go for the send.

By the way, here's some info/numbers on the RA/2019 stock block: https://forums.nasioc.com/forums/showthread.php?t=2892143

Long term at such power levels? We shall see. But pretty sure they'll be fine at stock powers....

Last edited by F1EA; 05-12-2019 at 08:44 PM.
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Old 05-12-2019, 07:18 PM   #15
archer1.8
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Quote:
Originally Posted by Kostamojen View Post
I'm kind of thinking the same with mine too, mayne just run some JDM pink springs and some of the draw siffeners and bushings and such. I can't find the spring rates for the springs though.

I haven't found this car needs a rear swaybar yet after autoxing it a few times. It rotates well enough, but I think sticky RE71rs helped a lot with that.
Maybe I am jumping the gun with the rear bar. I just owned so many Subarus in the past and the all benefited from a rear bar. Cant wait to get it on track
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Old 05-12-2019, 10:08 PM   #16
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Originally Posted by archer1.8 View Post
Maybe I am jumping the gun with the rear bar. I just owned so many Subarus in the past and the all benefited from a rear bar. Cant wait to get it on track
I'm worried about lifting a rear tire with a swaybar, I'm already getting some loss of traction due to the tire starting to lift and the rear diff causing the tire to do a burnout, have some photos of it but here is s video:

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Old 05-13-2019, 06:40 PM   #17
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What size rear bar do these have now? I saw they upgraded the rear bar on the S209 to a 20mm.

Also, any plans for a harness?
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Old 05-13-2019, 07:17 PM   #18
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Quote:
Originally Posted by archer1.8 View Post
What size rear bar do these have now? I saw they upgraded the rear bar on the S209 to a 20mm.
  • '15 - 17 have 20mm
  • '18 - '19 (STI & RA) have 19mm
  • S209 will have 20mm
A member on IWSTI measured the 19mm rear bar (from his RA) and an older 20mm bar and found them to be 19.24mm & 20.45mm respectively.
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Old 05-14-2019, 12:06 AM   #19
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I wonder why they reduced the size of the rear bar
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Old 05-14-2019, 01:22 AM   #20
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Originally Posted by archer1.8 View Post
I wonder why they reduced the size of the rear bar
The Group-N swaybars are even smaller.

IMO its always best to figure out your spring/shock setup FIRST, then try out swaybars as the final fine-tuning of your setup.
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Old 05-14-2019, 09:49 AM   #21
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Originally Posted by archer1.8 View Post
I wonder why they reduced the size of the rear bar
I've always wondered that myself. Back in my S2000 track days, I vividly remember mixing and matching various year OEM parts to get the desired suspension setup. Spring rates, both front and rear, changed almost every year on those cars. At one point, I had different strut/spring combinations from different years on my car just to get it to feel how I liked it. In later years, they took a lot of the "snappiness" out of it, which caused understeer. It wasn't uncommon to take a sway bar from an older S2000 and put it on a newer one.
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Old 05-14-2019, 10:39 AM   #22
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Quote:
Originally Posted by GravyRobber View Post
I've always wondered that myself. Back in my S2000 track days, I vividly remember mixing and matching various year OEM parts to get the desired suspension setup. Spring rates, both front and rear, changed almost every year on those cars. At one point, I had different strut/spring combinations from different years on my car just to get it to feel how I liked it. In later years, they took a lot of the "snappiness" out of it, which caused understeer. It wasn't uncommon to take a sway bar from an older S2000 and put it on a newer one.
I did the same with my '04 S2000.

I think as time progresses, manufacturers try to make the ride more comfortable for daily driving (softer suspension, more sound deadening, etc.). I think Subaru has done a nice job with balancing the 18+ STI in terms of a sporty suspension that's comfortable enough for daily driving.

Subaru seems to always error on the side of caution and lean more towards understeer, both with their alignment and rear sway bar size. I'm sure this is partially for safety and preventing accidents. I read a lot of stories of people crashing earlier model AP1 S2000s due to the snap oversteer.

FWIW, the rear sway bar size was reduced by 1mm at the same time that the struts/springs were revised, the wheels went up to 19" and the fully electronic DCCD (probably not related).
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Old 05-14-2019, 12:54 PM   #23
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Originally Posted by Kostamojen View Post
I'm worried about lifting a rear tire with a swaybar, I'm already getting some loss of traction due to the tire starting to lift and the rear diff causing the tire to do a burnout, have some photos of it but here is s video:

http://youtu.be/x1reXNYhNso
Just curious, what if you changed the rear diff to a clutch type? Wouldn't that be better for traction? I don't even know if there is one available, but I do know Cusco had some for the older STi models.

Anyways, great video and I love the Type RA
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Old 05-14-2019, 09:51 PM   #24
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Congrats! If this is the one that was recently for sale at Jones in Maryland, I semi-seriously contemplated trading in my WRX for it. A great looking ride - hope you enjoy it!

Of course, I'd probably would have had to sleep on the couch for a week for bringing home a car that my wife couldn't drive. And I'd have put too many miles on it anyway (my 2018 WRX already has close to 18k on it).
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Old 05-14-2019, 11:17 PM   #25
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Originally Posted by PSM300 View Post
Just curious, what if you changed the rear diff to a clutch type? Wouldn't that be better for traction? I don't even know if there is one available, but I do know Cusco had some for the older STi models.

Anyways, great video and I love the Type RA
Yes a clutch type would solve most of that problem. Expensive solution though.
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