Welcome to the North American Subaru Impreza Owners Club Sunday December 21, 2014
Home Forums WikiNASIOC Products Store Modifications Upgrade Garage
Click here to visit TireRack
Brakes & Suspension Forum sponsored by The Tire Rack

Losing traction? Need new tires?
Click here to visit the NASIOC Upgrade Garage...
Here you can view your subscribed threads, work with private messages and edit your profile and preferences Home Registration is free! Visit the NASIOC Store NASIOC Rules Search Find other members Frequently Asked Questions Calendar Archive NASIOC Upgrade Garage Logout
Go Back   NASIOC > NASIOC Technical > Brakes, Steering & Suspension

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 07-07-2003, 01:35 AM   #1
AcquaCow
NASIOC Supporter
 
Member#: 36838
Join Date: May 2003
Chapter/Region: MAIC
Location: Reston VA
Vehicle:
2001 SRP RSTi
2011 DGM WRX hatch

Default 17 or 20mm swaybar for 00RS?

grr...hate the understeer...esp when making U-turns in the rain. I need to balance this car out but don't know if 20mm is too stiff. I totaled my last car because the rear end whipped out on me, but then again I was on black ice at 45mph... I doubt I could have done much more than what I did to save myself. (Spun the car as hard as possible to cartwheel off the trees rather than hit head-on) I took 2 trees and spun back out into the road sliding to a stop in the ice.

I'm driving on new s-03's now and the car tracks 400% better in water than did the stock tires. The only thing that bothers me is that when I'm driving through nice curvy roads in the dry, the rear of the car seems to push out then rebound when it hits its limit. Lateral motion I suppose you call it. I want that to stop...from the front it feels like the car is wanting to slide, but its only the body shifting weight...trick for me is always to realize that its just the body of the car moving before I attempt to countersteer. My over-cautious reflexes from my accident always tell me to countersteer immediately =P

Think 17mm is perfect for a RS? or would 20mm be better?

All feedback is appreciated.

Thanks,

-- Dave
* Registered users of the site do not see these ads.
AcquaCow is offline   Reply With Quote
Old 07-07-2003, 10:44 AM   #2
AcquaCow
NASIOC Supporter
 
Member#: 36838
Join Date: May 2003
Chapter/Region: MAIC
Location: Reston VA
Vehicle:
2001 SRP RSTi
2011 DGM WRX hatch

Default

I have a WTS offer for a 17 and a 20mm bar, I just don't want to keep them waiting. If anyone can get back to me today I'd appreciate it.

Thanks,

-- David
AcquaCow is offline   Reply With Quote
Old 07-07-2003, 11:22 AM   #3
Safir
Scooby Guru
 
Member#: 3873
Join Date: Jan 2001
Location: Tampa, FL
Vehicle:
. Paradise is
like Disney with hookers

Default

I have a 19-21 adjustable on my MY01 - I run 19 in the winter and 21 in the summer, in some situations i find 21 to be too much (two instances in the last three summers of spinning the car in panick situations, one resulting in a pretty nasty impact) so it is probbly a little large for daily driving - I have heard people having very favorable results with the 17, and it would be enough to make for a totally different car when upgrading from the stock 13mm bar.

If you are running the same bar year round i would suggest the 17 for saftey's sake, otherwise the 20 would be O.K. if you are careful. I am sure others will contribute their suggestions as well.
Safir is offline   Reply With Quote
Old 07-07-2003, 02:30 PM   #4
Subie Gal
GC84Ever
Super Moderator
 
Member#: 301
Join Date: Sep 1999
Chapter/Region: NWIC
Location: WA
Vehicle:
1970 FF-1 & '70 Van
02 WRX/01 RS

Default

I run an 18mm STi/FHI bar on my RS...
& I've never thought of swapping it for anything else!

front bar = 19mm

with an 18mm rear, the car is very neutral and easy to handle and predict.... i imagine 17 will still understeer a bit and 20mm would enhance a tick of oversteer but handle just fine...

it's a matter of preference, budget and driving style.

good luck
Jamie
www.subiegalracing.com
Subie Gal is offline   Reply With Quote
Old 07-07-2003, 04:02 PM   #5
stimpy
Homicidal Maniac
Moderator
 
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
Vehicle:
2008 STI

Default

It depends on your suspension, ultimately. I had a Whiteline adjustible 18-22mm rear bar with Tein S-Tech springs and AGX struts. The car was very balanced at 20mm. I actually timed slower in the autox with 22mm. It was just incorrect. When I removed the struts and springs and went back to stock the 20mm rear bar was overbearing. The car felt unstable and did not feel well engineered. Dropping down to 18mm brought back the balanced feeling again.

Your suspension is an entire package and should be treated as such. Each component makes certain contributions and if that is altered it could improve that aspect or it could bring the ultimate performance down. With that said, I remember DMS touting their suspension was designed to work well with the stock sway bars. My L seems to be handling very well with the current stock sway bars but with STi trailing arms. My WRX Wagon did exceptionally well with the stock bars. My RS, however, needed a little bump in the rear.

The anti-sway bars are designed, in a very general sense, to reduce suspension travel differences between left and right. This just means it reduces body roll. However, in preventing the body roll, the weight is unable to transfer to the outer tire and increase the rolling kinetic friction available to keep the car from sliding. The end effect is a reduced amount of traction. A better solution, rather than reducing the traction in the rear, is to increase the traction available in the front. This can be done through suspension tuning or doing with a softer front sway-bar. Most people have it engrained in their brains that a larger rear swaybar must be better and most opt for that solution.

-Jon
stimpy is offline   Reply With Quote
Old 07-07-2003, 04:23 PM   #6
AcquaCow
NASIOC Supporter
 
Member#: 36838
Join Date: May 2003
Chapter/Region: MAIC
Location: Reston VA
Vehicle:
2001 SRP RSTi
2011 DGM WRX hatch

Default

Jon...thanks for the insight...so what would be your recommendation? Stock 00RS...sounds like 20 will be a tad too much...I should go for the 17?

-- Dave
AcquaCow is offline   Reply With Quote
Old 07-07-2003, 04:31 PM   #7
stimpy
Homicidal Maniac
Moderator
 
Member#: 1612
Join Date: Jun 2000
Location: Austin, TX
Vehicle:
2008 STI

Default

I personally felt that the 18mm bar was very livable. It can still produce snap oversteer if prompted. But, if you are aware of it and have practiced dealing with it then it should be just fine.

-Jon
stimpy is offline   Reply With Quote
Old 07-07-2003, 06:25 PM   #8
JewPac42
Scooby Guru
 
Member#: 23260
Join Date: Aug 2002
Chapter/Region: BAIC
Location: -=3/1 Jew Crew=-
Vehicle:
Patr ick Willis
for Rookie of the year

Default

I daily drive my RS with a 21mm rear bar and have had no problems with it at all. The handling is greatly improved over stock (I'm also running 5Zigen springs) and I have not had any problem with the rear sliding out. I dont autox and have not yet been to a track day, but I dont anticipate any problems.
JewPac42 is offline   Reply With Quote
Old 07-07-2003, 07:06 PM   #9
mofugga
Scooby Specialist
 
Member#: 19540
Join Date: Jun 2002
Chapter/Region: South East
Location: Clearwater, FL
Vehicle:
2000 old skool RS
BRP

Default

i also have the whiteline 18-22mm bar. 18 makes the car very neutral, 20 gives it some oversteer and i've yet to try 22 as i'm still on the stock suspension. i'd suggest an adjustable bar as you can change the settings to alter your car's handling. start it at the lowest setting and move upwards as you see fit.

oh yeah, front and rear endlinks really helped improve the handling on mine also.
mofugga is offline   Reply With Quote
Old 07-11-2003, 02:09 AM   #10
WL Flatout
Scooby Newbie
 
Member#: 35326
Join Date: Apr 2003
Location: Sydney Australia
Default

G'day everyone,

We've just setup an FTP section of our web site at ftp://ftp.whiteline.com.au/. This lets us post a heap of stuff for download with out cluttering the web site, things like high resolution product shots and test data.

Now, if you click ftp://ftp.whiteline.com.au/Images/Testing/ you will see a couple of GIF versions of some skid pan testing we did comparing factory swaybars with ours. The 2 files prefixed MS_PrexIII show the outcome.

File ftp://ftp.whiteline.com.au/Images/Te...I_RZ_v_std.gif shows a standard longitudunal vs lateral G force plot comparing a stock rear ARB vs our BFR36Z fitted to our GD series MY03 project WRX. This clearly shows the Whiteline bar red pattern moving closer to the longitudunal G force zero point indicating less understeer.

The other file shows lateral g's vs velocity for the 2 different bars. The red pattern indicating the outcome of the Whiteline ARB with a higher sustainable speed. BFR36Z is a 22mm adjustable and the test was conducted with the bar set on middle or approx 22mm equivalent.

Hope that helps with this discussion as we have been doing lots of testing with some new equipment to help quantify what we generally feel in the seat of our pants.

Please feel free to have a look and a poke around this new area as there are some great new product shots featuring the new colour.

Best regards

Jim Gurieff
Whiteline
WL Flatout is offline   Reply With Quote
Old 07-11-2003, 05:17 AM   #11
au112
Scooby Specialist
 
Member#: 4412
Join Date: Feb 2001
Location: Port Moody BC Canada
Vehicle:
MY01 Impreza 2.5RS
BRP

Default

Need some advice here,

I am going to get 21mm cusco adj. RSB, what should I get for front? 21mm or 22mm?
I also have AGX/Eibach.

Please give me some advice.

Andy
au112 is offline   Reply With Quote
Old 07-11-2003, 09:29 AM   #12
Jack
Add Lightness
Moderator
 
Member#: 13699
Join Date: Dec 2001
Chapter/Region: NESIC
Location: Hopkinton, MA
Vehicle:
2007 Lotus Elise
(From General)

Default

Dave,

I think your story makes you a perfect candidate for some on-track driver schools or autocross series. With proper training and understanding of the dynamics of the car, you can make the car do whatever you want it to do. Once you do a bit of this, you'll be able to make any car oversteer, understeer, stay neutral based on what you want it to do.

jack
Jack 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

Similar Threads
Thread Thread Starter Forum Replies Last Post
WTB: Front and/or rear swaybars for bugeye jahl7787 Private 'Wanted' Classifieds 2 06-08-2008 10:05 PM
Cusco or Hotchkis swaybars for STi? Speed Factory Brakes, Steering & Suspension 2 10-07-2005 04:49 PM
20mm swaybar for pickup in Calgary Mike D02 Canada Region Forum 2 04-18-2004 04:07 PM
Gauging interest/avalability: 17 or 20mm rear swaybar? Daz Canada Region Forum 2 07-31-2003 01:21 AM
Help? 18mm or 20mm bar for my Forester mpiotro General Community 3 12-03-2001 07:39 PM


All times are GMT -4. The time now is 09:50 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2014 Axivo Inc.
Copyright ©1999 - 2014, North American Subaru Impreza Owners Club, Inc.