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Old 02-19-2019, 03:34 PM   #1
WRXnick16
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Member#: 447898
Join Date: May 2016
Location: Sacramento, CA
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2019 STI
Crystal White Pearl

Default 2015+ WRX - STI solid steering joint swap?

Has anyone installed the solid steering u-joint/linkage from the STI (part# 34170VA030) in a 2015+ WRX?

I've seen a few posts that suggest that it's interchangeable, but I haven't seen anyone post firsthand experience. I understand that it's interchangeable on older models, but wanted to verify since the newer platform has EPS.

I'd prefer to go this route and completely eliminate the rubber dampener rather than installing the Perrin steering dampener lockdown on top of it.

Thanks!
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Last edited by WRXnick16; 02-19-2019 at 05:33 PM.
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Old 02-19-2019, 06:21 PM   #2
uofime
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Member#: 421271
Join Date: May 2015
Chapter/Region: MWSOC
Location: Chicago
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2015 WRX
Galaxy Blue Pearl

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Quote:
Originally Posted by WRXnick16 View Post
Has anyone installed the solid steering u-joint/linkage from the STI (part# 34170VA030) in a 2015+ WRX?

I've seen a few posts that suggest that it's interchangeable, but I haven't seen anyone post firsthand experience. I understand that it's interchangeable on older models, but wanted to verify since the newer platform has EPS.

I'd prefer to go this route and completely eliminate the rubber dampener rather than installing the Perrin steering dampener lockdown on top of it.

Thanks!
Yes I personally have. Look at my build diary. I wrote a bit about install and effects.
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Old 02-19-2019, 07:45 PM   #3
WRXnick16
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2019 STI
Crystal White Pearl

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Quote:
Originally Posted by uofime View Post
Yes I personally have. Look at my build diary. I wrote a bit about install and effects.
Thanks! Your post was very insightful. I mainly questioned the fitment because all of the pictures that I looked at comparing the two linkages showed that the pinches were clocked quite differently. Your post confirms this to be the case and that it still fits.

I didn't expect a drastic change in steering feel and feedback, but it sounds like the install may be more hassle than it's worth (in comparison to Perrin's steering dampener lockdown). I'd prefer to use the OEM STI linkage since it's a simpler design, eliminates the rubber bushing, and possibly saves a few ounces.. but the install sounds less than appealing.

Direct link to uofime's install and review:
https://forums.nasioc.com/forums/sho...&postcount=109
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Old 02-19-2019, 08:10 PM   #4
Boggie1688
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WRB

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If it's the right length and the right spline count, then you only have to deal with alignment. But as discovered it is a total bitch.

If your off by one spline, your total steering angle is now uneven side to side. For simplicity sake, imagine the wheel can only turn 360 lock to lock. This is one full turn. Center is at 180, full counter 0, full clockwise 360. Now imagine there are 36 splines on the shaft. That means each spline equates to 10 degrees.

Get the install off by one spline, and you steering shifts 10 degrees clockwise or counter clockwise.

There is a steering angle sensor in the car and you can read it easily via the can bus. But I don't know if it is on the rack on the column and ideally you want both as you connect the two.
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Old 02-19-2019, 09:50 PM   #5
ROTORCRAFT230
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Plasma Blue

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I literally just ask and went through the same question except it was a 2014 WRX. The deciding factor was I didnít want to get an alignment after the install of the STI shaft if the steering wheel wasnít straight and to install the STI shaft was a more involved process. I installed the Perrin lockdown. It was super easy and the steering is much tighter and the steering wheel is perfectly straight. You can decide which way you want to go, I an very happy with the Perrin Lockdown
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Old 02-21-2019, 12:06 PM   #6
Jawsofire
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Galaxy Blue Pearl

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Install and alignment was easy and took less then 30 minutes. Helps when you learn from mistakes on someone else's car first . I noticed a good amount of difference in handling. I wouldn't even consider the Perrin lockdown if you can get a good deal on the OEM one.
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