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Old 01-25-2008, 01:43 AM   #26
bmxpunk
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Quote:
Originally Posted by bmxpunk View Post
What about 91-94 legacy Turbo sedan/ wagon I can't remember for sure but I think its 19/20mm front. 13mm? rear
OK according to the subaru Parts computer for the Legacy SS fronts are available in 18mm and 19mm. Rears were available in 16,17,19mm depending on sedan/wagon/ air suspension.
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Old 03-17-2008, 05:22 PM   #27
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Bump. Is the OP still maintaining this?
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Old 04-07-2008, 11:32 AM   #28
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My 2000 Outback (Legacy) Wagon started with a 21 mm FSB, which I snapped (yes, snapped, I don't know how other than mild off-roading- defective??). I replaced it with a 22 mm bar that Subaru's computer said was for a 2001+ Outback. I believe the rear was a 14mm initially, which I later replaced with a 17mm from a Baja. This mod was posted on iclub and referred to here somewhere. It was ideal for the car as a "comfort" vehicle.

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Old 04-16-2008, 06:33 PM   #29
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http://forums.nasioc.com/forums/show...61&postcount=5

Quote:
2002 to 1/2003 WRX Sedan rear sway = 20mm
1/2003 - on WRX Sedan rear sway = 17mm
I picked up a rear bar yesterday on craigslist from a 2003 wrx sedan...at first glance it looked like a 17mm, but I didn't have anything to measure with and everything I had read before said 2002 and 2003 wrx sedan rears were 20mm. Well, I haven't measured it yet but I did find this doing some searches. First post should be updated with production dates, that way it's easy for shmucks like me to ask somebody to look at their build date before driving across town to pick up parts I don't need.

Bryce
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Old 05-02-2008, 01:01 PM   #30
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Anyone know anything about the 08 WRX sway bar sizes?
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Old 05-02-2008, 01:13 PM   #31
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2005 & 2006 Saab 92x Aero
: 20F/17R

2005 & 2006 Saab 92x Linear
: 20F/13R
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Old 09-01-2008, 01:46 PM   #32
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Anyone know what size rsb comes stock on a 98 Forester?
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Old 09-02-2008, 08:58 AM   #33
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Quote:
Originally Posted by Ricter View Post
Anyone know what size rsb comes stock on a 98 Forester?
13 mm
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Old 10-01-2008, 09:51 AM   #34
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Originally Posted by ButtDyno View Post
Bump. Is the OP still maintaining this?

bump again.
I not lets make a new one.
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Old 12-01-2008, 08:59 AM   #35
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Looks like this has fallen apart... anyone want to handle keeping this up to date?
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Old 12-01-2008, 01:13 PM   #36
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02 Forester (assuming 98-02), 20mm front, 13mm (solid) rear.

My bro has an 04 FXT, 20mm front, rear is hollow, didn't think it was a 17mm but could have been, probably equiv. to the 13mm solid really. They're pretty much worthless twigs, more of just a placeholder for an upgrade then a useful part, imparting very little loading force.

Also, It might be useful to begin converting sway bar sizes to actuall (estimated) spring rates.
http://buildafastercar.com/tech/Sway...ate-Calculator

Data for 02 Forester (and 98-01 Impreza, 98-02 Forester) front swaybar:
A: 5.25"
B: 33"
C: 6.5"
D:20mm
Motion Ratio (MR): 0.50

equivalent spring rate at wheels:
lb/in force: 107.2 lb/in

My stock 20mm front swaybar effectively adds 107 lb/in of spring rate to the wheel on top of my spring, stock being 157 lb/in on my 02 Forester. One could also figure out relative roll resistance and the torque due to the lever arm via the wheel base and track width stance of the car, my 02 Forester being 99.4" in length(CG at 57%) and 58.1" in width on the front. One could extrapolate longitudinal dive and lateral roll resistance from this.

Although the calculator is simply a guessing tool to get close to the actual values, it isn't a precise measurement of the bar. One would actually have to physically test the bar to get real results. However, the calculator would get you close.

I just see it as more useful because the geometry of the bars change front and rear, the relative motion ratios change front and rear, and all this changes between newer and older models too. This means a 20mm front bar and 20mm rear bar doesn't do the same thing and a 20mm front bar from a STI and a 20mm front bar from a base Impreza also do not do the same thing. The geometry and motion ratios vary, making relative wheel rates vary despite being of the same bar size. Hollow vs. solid also play a roll, not to mention that the metal used may vary from one company to another, stepping from one steel alloy to another and using different heat treatments and getting different spring forces for even the same bar shape and size.
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Old 12-01-2008, 03:05 PM   #37
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Quote:
Originally Posted by Back Road Runner View Post
...the metal used may vary from one company to another, stepping from one steel alloy to another and using different heat treatments and getting different spring forces for even the same bar shape and size.

Actualy this isn't quite true. The Modulus of Elasticity for most spring steels that we use in torsion (G) is 11,200,000psi. (Silicon-Manganes is 10,750,000psi) Heat treat has a big impact on streangth, but has no effect upon spring rate untill the yield point. Minor changes don't have a big effect, unlike OD/ID which is D^4. (A solid bar has an ID of 0, so the math still works.)

The comments about motion ratio and wheel rates are very true.
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Old 12-01-2008, 06:19 PM   #38
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Interesting. I would figure spring force would vary a good bit from material to material. I do kind of understand that most companies will use a similar make up and treatment as only specific parameters make a good spring type metal. However, I would have guessed more variation since not all metals are sourced from the same place, formulated the same, and treated the same.

You're right though. Modulus of Elasticity is a linear part of the equation, so even significant changes don't contribute to nearly as much of a change as diameter as it's to the 4th power in the moment of inertia part of the equation. 11,000ksi to 10,000ksi simply isn't a tremendous change(10%) when just one mm added or subtracted may be 20% or more.
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Old 01-22-2009, 11:59 AM   #39
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Quote:
Originally Posted by ButtDyno View Post
Looks like this has fallen apart... anyone want to handle keeping this up to date?
I'm working on compiling a spreadsheet. you are about to have PM inbound.
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Old 10-13-2009, 05:02 PM   #40
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back from the dead. any idea what a s203 or s204 sway bar sizes are?
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Old 10-16-2009, 03:13 PM   #41
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anyone?
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Old 10-26-2009, 04:27 PM   #42
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Pardon my ignorance but I have a '05 [Legacy] Outback 2.5i and I haven't found the stock front/rear swaybar sizes listed here. Anyone know them? The rest of my suspension is also stock and I am just looking to reduce roll and understeer a little, without affecting the ride too much.
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Old 07-11-2010, 09:22 PM   #43
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can we update this?
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Old 07-12-2010, 02:37 PM   #44
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Quote:
Originally Posted by WRXcer View Post
Anyone know anything about the 08 WRX sway bar sizes?
front is definitely a 19, same for GR sti. Rear may be 13, but I can't remember for certain right now. Will measure bar that came off my uncle's and report back.
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Old 07-12-2010, 02:46 PM   #45
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i was told 09+ WRX had a 21mm front sway. i dont have a caliper to measure mine though
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Old 07-12-2010, 04:42 PM   #46
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Quote:
Originally Posted by gsrcrxsi View Post
i was told 09+ WRX had a 21mm front sway. i dont have a caliper to measure mine though
Yeah I think there was some bad info floating around. I do have calipers and my 09 WRX has a 21mm front sway, I think we are pretty sure about that one.

To recap:

08 WRX
F: 20mm
R: 16mm

09+WRX
F: 21mm
R: 17mm

Feel free to correct me if I am wrong...

Last edited by Power6; 08-29-2010 at 10:42 PM. Reason: I was wrong...
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Old 07-12-2010, 04:55 PM   #47
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08 WRX is likely a 15r

09+ WRX is 20f/16r

08+ sti is 20f/18r
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Old 07-12-2010, 06:07 PM   #48
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Quote:
Originally Posted by Lboogie View Post
08 WRX is likely a 15r

09+ WRX is 20f/16r

08+ sti is 20f/18r
Corrected above in my original post. You are wrong, stock 09+ WRX is 21/17, only the 08 WRX is 20/16.

Last edited by Power6; 08-29-2010 at 10:43 PM.
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Old 07-13-2010, 09:57 AM   #49
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Quote:
Originally Posted by Lboogie View Post
08 WRX is likely a 15r

09+ WRX is 20f/16r

08+ sti is 20f/18r
I'm thinking I was wrong about the 08 WRX front then- I thought it was the same size as my 08 sti.
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Old 08-27-2010, 10:32 PM   #50
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ok so what are the size's on the 07 WRX?? I don't see them posted on here.
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