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Old 11-15-2013, 12:39 AM   #1
leonyuen
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Member#: 330720
Join Date: Aug 2012
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2013 2.0i Sport 5dr
SWP

Talking 19mm STI Sway Bar Install on Subaru Impreza 2.0i

Hey Guys! I haven't seen anyone post a guide for the Impreza 2.0i so I decided to throw something quick together for those on the fence about installing it. If you haven't realized it, this is the best bang for buck suspension upgrade for our cars, and will make a difference on both the base version and the touring, sport etc. that already come with a sway bar. The bar will cost approximately $100 brand new online, or you can get it off someone on the forums! Without further delay, here we go!

Parts/Equipment Needed:
  • 19MM STi Rear Sway Bar with Bushings
  • Ratchet with 12MM and 14MM Socket *CONVERTED TO METRIC*
  • 14MM Spanner/Wrench
  • M5 Hex Key
  • Liquid Wrench or WD40 Rust Penetrant Lubricant
  • Ramps or Blocks

First, back your car onto ramps, or if you're cheap like me, back it onto 2x4 wood planks or SOLID BRICKS (not hollow ones). Ghetto garage set-up for the win =)


Next, spray the Liquid Wrench all over both endlink studs/nuts. Out of the factory, Subaru applies some sort of loctite on the nuts, and rust can build up quickly after 6 months of driving (depending on where you live). If you don't want to risk stripping the stud, spray some lube!

The first nuts to remove are the ones on the endlinks. Start with the 14MM socket ratchet to break the torque on nuts. Once they're semi-loose, use a combination of a wrench and 5MM hex key to lose the nuts off.


Next, remove the brackets holding the sway bar using the ratchet with a 12MM socket. Nothing to complicated here, but make sure to hold the sway bar after you remove the second bracket so it doesn't smack you in the face. You'll have to reverse tetris the sway bar out from under the car. Pay attention to the orientation of the sway bar - the arch should convex up (concave down) when installed.


Here's the 15mm OEM and 19mm STi next to each other. Can't really tell the difference except my 15 mm OEM is dirtier... and the 19MM STI is heavier..



To install the 19mm sway bar, just do it reverse - Tetris the 19mm sway bar in, put the nut on the sway bar loosely, but don't tighten. Make sure the sway bar is centered between both endlinks, then re-install the brackets with the new 19 mm bushings. Tighten to 18 ft-lbs. Once brackets are installed, tighten the endlink nuts evenly. I'm sure there's a proper torque spec, but I just tightened it until it was really tight , just don't strip the nut. Tighten to 33 ft-lbs.


After this, take it for a drive! Go on some highway ramps to see how turning flat actually feels! If you hear any clicking when turning hard, you might need to tighten the endlinks.. otherwise enjoy!
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Last edited by leonyuen; 07-31-2014 at 11:57 PM.
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Old 07-31-2014, 11:12 AM   #2
wrx_gon
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Member#: 166233
Join Date: Dec 2007
Chapter/Region: MWSOC
Location: Cape Girardeau, Mo
Vehicle:
'12 Legacy 2.5i Pre
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About to do this to my '12 Legacy.
Nice write up and thanks!
Have you notice a big difference in coming out of a corner and going into another opposite direction?
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Old 07-31-2014, 12:42 PM   #3
Patrick Olsen
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Join Date: Jul 1999
Chapter/Region: AKIC
Location: Where the Navy sends me...
Vehicle:
1997 Legacy 2.5GT
QuickSilver Metallic

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1/2" and 9/16"?

Do yourself a favor and use your metric sockets so you don't round off any nuts or bolts. Other than perhaps the spark plugs there aren't any english/imperial fasteners on your car.

Quote:
Originally Posted by leonyuen View Post
Parts/Equipment Needed:
  • 19MM STi Rear Sway Bar with Bushings
  • Ratchet with 1/2" and 9/16" 12, 13 and 14mm Sockets
  • 9/16" 14mm Spanner/Wrench
  • 3/16" 4.5mm or 5mm (?) Hex Key
  • Liquid Wrench or WD40 Rust Penetrant Lubricant
  • Ramps or Blocks

Last edited by Patrick Olsen; 07-31-2014 at 12:48 PM.
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Old 07-31-2014, 03:27 PM   #4
Baceramus
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Member#: 394925
Join Date: Jun 2014
Vehicle:
2014 Impreza 2.0i
Dark Grey

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For those of us who are the lowest of the low with a base model 2.0i and no stock rsb what size bar would you recommend? Grab someone's old 15mm or order a newer 19mm? Going from no bar to a 19 sounds like a big jump. I know I'll need brackets, bushings, and endlinks so I'll pursue that on my own.

Thanks much for the write-up, well done!
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Old 07-31-2014, 03:39 PM   #5
oaklandish_WRX
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Location: the 5 n dime, NORCAL
Vehicle:
2002 0[[XXXXoXXXX]]0
MBP

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Quote:
Originally Posted by Patrick Olsen View Post
1/2" and 9/16"?

Do yourself a favor and use your metric sockets so you don't round off any nuts or bolts. Other than perhaps the spark plugs there aren't any english/imperial fasteners on your car.
+65464316514634


And perhaps also find the actual torque specs for the fasteners...at least think of other road dwellers, if not yourself .
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Old 07-31-2014, 04:36 PM   #6
isotopesope
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Member#: 265783
Join Date: Dec 2010
Chapter/Region: RMIC
Location: colorado springs
Vehicle:
2008 wrx

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Quote:
Originally Posted by Baceramus View Post
For those of us who are the lowest of the low with a base model 2.0i and no stock rsb what size bar would you recommend? Grab someone's old 15mm or order a newer 19mm? Going from no bar to a 19 sounds like a big jump. I know I'll need brackets, bushings, and endlinks so I'll pursue that on my own.

Thanks much for the write-up, well done!
you'll be stoked with the 19mm. I added a 19mm one to my wifes 2012 Impreza sport. It is a nice, but subtle, improvement. It won't feel overpowering, even coming from your base model.
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Old 07-31-2014, 05:00 PM   #7
Baceramus
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Member#: 394925
Join Date: Jun 2014
Vehicle:
2014 Impreza 2.0i
Dark Grey

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Quote:
Originally Posted by isotopesope View Post
you'll be stoked with the 19mm. I added a 19mm one to my wifes 2012 Impreza sport. It is a nice, but subtle, improvement. It won't feel overpowering, even coming from your base model.
Excellent, thank you.
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Old 08-01-2014, 12:00 AM   #8
leonyuen
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Member#: 330720
Join Date: Aug 2012
Chapter/Region: W. Canada
Location: Canada
Vehicle:
2013 2.0i Sport 5dr
SWP

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Yeah for sure - before installing I gunned it tight around a few corners, and then did the same corner after the install. Definitely a noticeable reduction in sway, which was awesome. Keep in mind this will make you fish tail just a tad more in the winter. Overall, the car feels like it handles much better.

After about a year, it's almost feeling like I could do with an even stiffer RSB, but it's really not worth my time/money at this point.

I fixed all the tool sizes - you're absolutely right, it's supposed to be metric. I just made do with some close enough sockets/hexes and got lucky.

Happy modding!
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Old 08-07-2014, 01:55 PM   #9
CVT-FB20
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Join Date: Apr 2014
Chapter/Region: Tri-State
Location: Rochester NY
Vehicle:
2014 Impreza Sport
Quartz Blue Pearl

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Just installed on my sport premium hatchback. BIG difference, particularly at slower city-cornering speeds. Throwing it into a sharp turn at 65 will still get you some body roll, but a lot less. Great use for $100. Totally happy.


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