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Old 03-04-2015, 06:46 PM   #1
stevesnow
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Default 2015 WRX & 2015 WRX STI Sway Bar Discussion

There seems to be more sway bars added everyday. What is working for people and what isn't?

I will post more info on availability and sizing later...

Seems like 2015 STI & WRX both have 24mm front and 20mm rear sway bars stock.

Seems like a lot of people like the Perrin (Solid) 22mm adjustable rear bar, which was one of the first to market & the whiteline rear sway bar.
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Old 03-04-2015, 10:03 PM   #2
WRX YNZ
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Im running stock sway bar in the front (24mm) and running a Whiteline 24mm sway bar in the rear on the medium setting (usually go to hard on the track) with the Perrin Endlinks (get good ones, ive heard the stock ones can snap). But research gets you everywhere on this website, do whatever you want and what suits your needs.
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Old 03-04-2015, 10:07 PM   #3
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Old 03-08-2015, 08:59 AM   #4
giftedx29
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i'm interested when someone finally release sway bar's with Urethane and Teflon Bushings so i dont have to do maintenance on them, because honestly who wants to relube bushing 4x's a year?
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Old 03-08-2015, 10:47 AM   #5
mxl16
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I just installed the RCE sway bar kit yesterday and I can tell you that the difference is huge. Both front and rear are 25.5mm hollow with 2 available positions.
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Old 03-08-2015, 10:52 PM   #6
WRX YNZ
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Most kits come with polyurethane bushings. My whiteline did
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Old 03-09-2015, 09:17 AM   #7
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Quote:
Originally Posted by WRX YNZ View Post
Most kits come with polyurethane bushings. My whiteline did
its the combination of both that are maintenance free and noise free
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Old 03-09-2015, 11:27 AM   #8
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Quote:
Originally Posted by giftedx29 View Post
its the combination of both that are maintenance free and noise free
Mostly....mine went 3 years before they started squeaking, which is pretty good IMO. Eventually they all get dry and start.
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Old 03-09-2015, 11:34 AM   #9
shadrag
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I've heard a few drivers mention that on the 2015 a smaller front bar works better than a bigger rear bar for combating understeer... to bad the aftermarket only goes bigger...
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Old 03-09-2015, 08:28 PM   #10
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Quote:
Originally Posted by shadrag View Post
I've heard a few drivers mention that on the 2015 a smaller front bar works better than a bigger rear bar for combating understeer... to bad the aftermarket only goes bigger...
Do you mean keeping the front stock? If so anything bigger than a 24mm in the rear would do the trick.

I can only speak from experience on my setup and driving preference, but going to a neutral setup is great on backroads, its more predictable.
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Old 03-09-2015, 09:03 PM   #11
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Quote:
Originally Posted by WRX YNZ View Post
Do you mean keeping the front stock? If so anything bigger than a 24mm in the rear would do the trick.

I can only speak from experience on my setup and driving preference, but going to a neutral setup is great on backroads, its more predictable.
No he means running a smaller front bar and the OEM rear bar. I "think" what people are doing is buying the previous generation OEM WRX front bar which runs smaller (21mm) and fits our 2015+ cars. I'm just waiting for someone to confirm that the previous generation front bars actually fit our cars.
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Old 03-13-2015, 05:22 PM   #12
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That would make the body roll significantly in the front if you reduced the size. So just out of curiosity, why would you do this when you could increase the size of the rear sway and accomplish the same thing, and have more stability in the corners?
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Old 03-13-2015, 07:22 PM   #13
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Because sometimes a huge rear sway bar will lift the inside tire off the ground and make the car handle weird. (less traction off the corners, etc....) Sometimes having some body roll is a good thing and can create more grip. Sway bars always take away grip.
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Old 03-13-2015, 08:27 PM   #14
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How big of a sway bar are you planning on putting on your car? I auto-x and track my car every year with a 24mm sway in the rear on hard (during track) and have never had a tire come off the ground. I have had upgraded sway bars (bigger sizes) on most of my cars and grip always increased because body roll had decreased. Where is your evidence that supports that sway bars take away grip? And if there is evidence, then why would so many companies create larger sizes for the rear of our 2015 wrxs?
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Old 03-13-2015, 08:37 PM   #15
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http://lmgtfy.com/?q=Anti-roll+bars

I will just leave this here
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Old 03-14-2015, 11:53 AM   #16
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Are you trying to start an argument or do you want an honest answer. (sheesh!)

Adding a large rear sway bar (I'm running a 24mm with stock front) will take a way traction from the rear which makes the car rotate better in the corners. Think about it, when the chassis rolls over, the sway bar twists. It adds roll stiffness to that end of the car, but it also applies lifting force to the inside tire. You see this all the time with FWD cars running rear sway bars. They lift their inside tire off the ground in tight corners. Same thing happens with our nose heavy AWD cars.

Of course the correct way to increase roll stiffness is with stiffer springs, but we can't do that in the D-Street (or B-Street) classes.

I have some recent photos of a D-Street 2015 WRX running a large rear sway bar lifting his inside tire at an autocross. I could post them if you still don't believe me.

EDIT: I don't think this is as much of an issue on a road course where there are no tight corners like in an autocross environment. So it doesn't surprise me that you've never experienced lifting a rear tire. Sounds like you're happy with your setup. Congrats! :-)
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Old 04-15-2015, 10:11 PM   #17
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Question 2015 WRX/STI 20mm RSB fits a 2011 WRX ?

Hey,

Do you guys know if the 2015 WRX/STI stock 20mm rear sway bar (20451VA000) is compatible with with the previous gen WRX (2011-2014) ?

I think it would be a very nice upgrade for a WRX owner (like me) who just want a nice DD and you guys with 2015's could amortize the cost of an aftermarket bar by selling the stock one.
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Old 04-15-2015, 10:27 PM   #18
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Quote:
Originally Posted by .AWDSOME. View Post
Hey,

Do you guys know if the 2015 WRX/STI stock 20mm rear sway bar (20451VA000) is compatible with with the previous gen WRX (2011-2014) ?

I think it would be a very nice upgrade for a WRX owner (like me) who just want a nice DD and you guys with 2015's could amortize the cost of an aftermarket bar by selling the stock one.
http://forums.nasioc.com/forums/show....php?t=2623235

Here is more info on that subject for you. do a ctrl+f and type "sway"
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Old 04-16-2015, 01:33 AM   #19
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Quote:
Originally Posted by ColdSoda View Post
http://forums.nasioc.com/forums/show....php?t=2623235

Here is more info on that subject for you. do a ctrl+f and type "sway"
Never knew about this control and f search bar. Pretty happy now that I know, thanks ColdSoda. Hit me with some others if there are.
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Old 04-16-2015, 02:00 AM   #20
Jairen
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Any reviews on the RCE F&R sways yet?
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Old 04-16-2015, 10:46 AM   #21
jaboyd
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In general "push" can be caused by either too little or too much front bar. If the front of the car is rolling "exce
ssively" in mid-corner then more front bar is needed (especially in autox situations at slow speed and high rates of body movement) or if the car is not rolling "excessively" reducing the bar to have better tire "bite". Also remember the rear bar transfers weigh (pitch/roll) to the opposite corner of the car, ...so when cornering a stiffer rear bar will transfer more weight to the front outside corner. This can actually act as if the front swaybar has been reduced by applying more roll/pitch to the front outside tire aiding bite. For autox this setup brings the added benefit of lessening the load on the rear inside tire, reducing grip on that tire and creating more rotation. If done "within reason" this is a plausible way to adjust the car for a specific event/application but compromises the overall setup for real world DD use.

Reducing the front bar size instead, can also provide more front bite wo/excessive roll...but will add some roll. Some drivers detest any roll and will go to extremes to dial it out by stiffening the car assuming it is causing the handling problems...but there is a point where softening may actually be a better overall solution.

Obviously in certain classes where upgrades are severely limited sway bar changes maybe the only practical/legal options. IMO there isn't a simple one answer fits all combo bc it is so dependent on the constraints ($$$, restrictions, driver preference, type of use and mods).

The 2015 is the best oem suspension so far, but just bc they stiffened the sway bars doesn't mean that they can't be tweaked to match what you want. I'd suggest for DD that occasionally see autox and running in stock or near stock classes you might want to try softening the front bar using the stock rear bar. When available an aftmkt front WL24mm or Super Pro 22mm would give the ability to test the effectiveness of this approach. I believe an RCE 25.5 hollow bar would work also, previous one rated at 22.7 soft 23.5 hard. This does not mean that the rear bar might also need to be raised, but it would need less increase...so a adj 22mm rear bar might work really well.

Last edited by jaboyd; 04-16-2015 at 02:16 PM.
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Old 11-25-2016, 12:49 AM   #22
BeastCoastWRX
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Hi Guys

I got whiteline 22mm rear sway bar on my 16' wrx. Planning to install Kartboy endlinks.
I broke one of the flange bolts for lateral link assembly when installing the sway bar(Make sure to check torque specs!).
Does anyone know where I can get a replacement flange bolt for lateral link assembly?
Pretty sure the original part number is M00011 for the shorter bolt, but I need a long one to fit the the extra supporting brace that whiteline provides.

I emailed whiteline and the vendor I got the sway bar from, so I'll let you know if I hear anything from them.

Thanks.
Rob
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Old 12-19-2016, 10:42 PM   #23
NubImpreza
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I like the "neutral" feel of same sized FSB and RSB. Any understeer or oversteer is easily corrected by driver skill. For my new 2017 WRX sedan base, I ordered 24mm Whiteline RSB because it also came with reinforcing "Braces". I also ordered the Cartboy end links because the adjustable Whiteline endlinks are garbage from my personal experience. They ripped apart under hard cornering in my 2015 NA Impreza with a 22mm Whiteline RSB .
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Old 12-31-2016, 01:53 PM   #24
Cisco Kidd
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Quote:
Originally Posted by NubImpreza View Post
I like the "neutral" feel of same sized FSB and RSB. Any understeer or oversteer is easily corrected by driver skill. For my new 2017 WRX sedan base, I ordered 24mm Whiteline RSB because it also came with reinforcing "Braces". I also ordered the Cartboy end links because the adjustable Whiteline endlinks are garbage from my personal experience. They ripped apart under hard cornering in my 2015 NA Impreza with a 22mm Whiteline RSB .
Interesting on the Whiteline end links being junk in your opinion. I am trying to figure out which combo to go with. Currently on Eibach pro springs, plan to upgrade from D bushings

1) Eibach 22mm RSB hollow w Kartboy endlinks

2) Whiteline 22mm RSB w Whiteline endlinks

I see the advantage that the Whiteline combo will provide braces as well and should be stiffer overall, The Eibach combo will not be as stiff and I am just trying to get slightly stiffer than where I currently am.
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Old 12-31-2016, 02:13 PM   #25
DaveC113
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Check out the understeer correction kit from Cygnus. I went w/ 22mm Super Pro rear bar, links and Cusco braces for my '16 STi. Just got it, not installed yet...
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