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Old 10-18-2003, 04:35 PM   #1
links_courses
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Question 17mm Front Swaybar + 22mm Rear Swaybar

17mm Front Swaybar + 22mm Rear Swaybar

This is the current setup on my 2004 WRX sedan. (Stock front sway + Cusco rear sway set to 22mm.) I also have rear solid endlinks. In your opinion, what are the pros and cons of not size-matching on this model year sedan?

I think the understeer is much less which I like, but I haven't really "tested the limits" yet so I am wondering if now I am going to be in a too much oversteer situation.

Also, does this make a difference in snow?

Think putting a 20mm front sway will make the car more neutral?
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Old 10-19-2003, 04:49 AM   #2
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This combination will likely eliminate all understeer during cornering. In fact, it will more likely to have oversteer. I think you should really get the bigger asap before you accidently lose your control during cornering .

I have stock RS bar in the front and 22mm cusco at the back for a few dry days before I put the 22mm front on. I do have the feeling that the rear tires are gonna to lose the grip on a 90 deg corner at about 40km/h. Normally, the car will understeer with stock setup. But stock + 22mm will oversteer for sure. I am grad that I have taken the 22mm rear off before the rain has come last week.

22mm front and 21mm adj rear is a good combo.

But I have sold them (because they are cusco ), and waiting for my Whiteline.

Cheers
Andy
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Old 10-19-2003, 09:16 AM   #3
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Andy, thanks for the reply.

In the US, the 2004 WRX comes with 17mm front and rear swaybars. As you state, this setup is designed for understeer. However, I recall reading that the understeer was increased in the late 2003 and all 2004 WRX's because of some oversteer car accidents with novice drivers.

I just took the car out for some spirited driving and I think I am at neutral for most speeds and slight oversteer at high speeds. I think I prefer this to the large understeer in the stock setup.

However, wouldn't putting 22 front with 21 rear cause understeer if the stock setup understeers with matching 17's? A larger sway in the rear seems to be a definite and my latest test drive seems to bear this out.

Of course, I realize that there is more to this than the sways (springs, struts, tire pressures, etc.)
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Old 10-19-2003, 06:08 PM   #4
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Before I got the cusco, I have the FHI 18mm RSB to combo with the stock FSB. It understeers in all (normal driving) condition, but I can throw my tail if I really want it too (eg, on snow). On the other hand, the stock setting is (nearly) impossible to oversteer the car while the stock has 13mm rear.

I think most of the people change their RSB because they want to decrease the amount of bodyroll, and bigger RSB does help alot. But it is always better to have a right combination of FSB and RSB for safety though and performance. Steering response is much better with FSB and it is always safer to have neutral than having it understeer .

Cusco 22mm FSB and 21mm adj RSB is very good combo though I didn't push it to see whether it understeer or not, but too bad that I have to sell them. Well, I am getting whiteline again and I will see.

PS: I set the 21mm adj RSB at the mid setting, which is equivalent to 22mm.

Andy
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Old 10-19-2003, 06:13 PM   #5
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i thought the RS was 17 front/rear and the WRX was 20 front/rear
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Old 10-19-2003, 06:17 PM   #6
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The 2002 and early 2003 used 20mm bars. Late 2003 and ALL 2004 WRX sedans have 17mm front and 17mm rear. Measure it and you will see. Like you, I thought I had a 20 mm in the rear but several Suby experts corrected me (I was trying to sell it as 20mm) and after measuring, they are correct: 17mm. Bummer, huh?

Get the larger rear sway and solid endlinks - a world of difference!
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Old 10-19-2003, 07:22 PM   #7
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The stock front swaybar on the '02 WRX Wagon and Sedan is 20mm not 17mm. I just measured mine ('02 Wagon), it's 20mm.

As far as I know the '02 and '03 WRX's Wagons have 20mm front and 17mm rear swaybars from the factory. The '02 sedans had 20mm swyabars front and rear. Sometime in '03 the rear was reduced to 17mm on the sedan. The front has always been 20mm.

Steve
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Old 10-19-2003, 09:25 PM   #8
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The front/rear bars are 17mm on the 2004 WRX Sedan. See Subiegal's post:

http://forums.nasioc.com/forums/show.../t-402798.html

Last edited by links_courses; 10-19-2003 at 09:52 PM.
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Old 10-20-2003, 02:32 AM   #9
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Go to an auto-x and find out how your car handles with that setup before changing anything. You need to know how your car works and if you like how it works before you decide to change it.
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Old 10-20-2003, 10:36 AM   #10
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Actually I think that all 2004 Imprezas get 20mm front sway bars, except for the STi where it gets a 19mm front bar. There's a post with a link to a image file which gives the suspension specifications for the 2004 Imprezas. The file is called 2004STi_geometry.gif, but I can't seem to find in on this forum.
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Old 10-20-2003, 12:07 PM   #11
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Hmm. I guess I have to crawl underneath and measure the darned thing now. I will do so late today and get back to this forum. If anybody else measures their front sway in the 2004 before I do, post please to save me the effort. Measure the circumference and divide by pi. (Circumference= pi x diameter)

Scott
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Old 10-20-2003, 01:58 PM   #12
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I have the same set up. I have my rear sway bar set on full stiff. The only time I feel it's a problem is on gravel roads at 'high' speed, so I take it very easy.

On tarmac, it's really easy to control the car with the throttle. Under hard accel, coming out of a corner in second gear, it is fairly neutral (4 wheel drift), with a little leeway for adjustability. You can get snap oversteer under some conditions if you lift suddenly or touch the brakes at the wrong time.

In third gear, it completely removed the understeer without any tendency toward oversteer (unless you lift mid-turn).

For rallyX, it made getting rotation super easy.
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Old 10-20-2003, 04:47 PM   #13
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THE DEBATE IS OVER!

2004 WRX Sedan Sway Bar (or swaybar) Actual Measurements:

Front: 20mm
Rear: 17mm:

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Old 10-20-2003, 09:47 PM   #14
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I was looking to get both the Perrin front and rear sway bars but now I'm confused. Should I go just with the Perrin rear bar at the stiffest setting (I believe it is 22mm to 24mm) and the stock bar up front (17mm)? Or both Perrin bars with the front at the softest setting (22mm but I don't know the other settings), and the rear at the stiffest? I am also thinking of getting STi springs but I heard that they ruin your struts after 20,000 miles. I've got great tires (Bridgestone Potenza RE950 225/50-16's) and I'd like my car to handle in the curves on the street real tight with minimal dive and roll...

Please Help!
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Old 10-20-2003, 10:31 PM   #15
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If you have the 04 WRX Sedan, your front bar is 20mm. I have the stocker up front and the Cusco 22mm rear set at the middle setting. I am very happy with the performance with this setup.
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Old 10-20-2003, 10:46 PM   #16
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Quote:
Originally posted by links_courses
If you have the 04 WRX Sedan, your front bar is 20mm. I have the stocker up front and the Cusco 22mm rear set at the middle setting. I am very happy with the performance with this setup.
Very cool. Thank you. Anyone else w/ suggestions?
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Old 10-20-2003, 11:44 PM   #17
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Thumbs up

Hearing all this great feedback, I'm ordering my Cusco sway bar tomorrow
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Old 10-21-2003, 12:05 AM   #18
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i only have a rear sway set to 22mm and the stock front sway. Is upgrading the front to say a fixed whiteline or cusco at 21mm or 22mm worth it? Lately when i talk to peopel they say the front sway did nothign compared to stock and to not waste your money on it. Is this true or does the front really help? I don't autox yet but do drive hard on mountain and on street so would it benifit me to purchase a front sway?
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Old 10-21-2003, 02:14 AM   #19
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I have a WRX wagon with Whiteline ALK and Whiteline swaybars, fixed 22mm front and adjustable 22mm rear (set to 24mm) with Whiteline alloy endlinks. I also have KONI inserts with the stock springs and STi top mounts. With the 22mm front bar, initial turn in is a little sharper and the car corners a little flatter than with the stock 20mm bar. The 22mm bar also adds a little more understeer at higher speeds.

Steve

Last edited by spelk3; 10-21-2003 at 12:52 PM.
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Old 10-21-2003, 04:35 AM   #20
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Larger FSB does not make as dramatic difference as comparing to larger RSB. But I think it is still worth to get it in my opinion.

Andy
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Old 10-21-2003, 05:26 AM   #21
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Get SOLID ENDLINKS also! I put both on at the same time. Also, grease the hell out of the bar bushings or you will get a creaking sound after awhile. I have the creak in cold weather.

The end links are important. Some suggest more important than the sway bar. The stock endlinks, at least in the US, can flex on turns which makes the car ride softer but decreases handling response.

Quote:
Originally posted by Zuffy
Hearing all this great feedback, I'm ordering my Cusco sway bar tomorrow
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Old 10-21-2003, 10:32 AM   #22
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Quote:
Get SOLID ENDLINKS also!
Yep, I have the Perrin ones already, so I just need a rear sway bar now. Did you have any problems with the stock sway bar mount flexing with the Cusco bar?
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Old 10-21-2003, 12:13 PM   #23
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Not that I have noticed. I read that the mounts on the 2004 were strengthened over the 2002-2003 cars. The Perrin sway bar comes with mounts so that might influence your choice.
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Old 10-21-2003, 03:32 PM   #24
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I was heavily considering the Perrin rear bar, but I like the adjustiblity range of the Cusco bar which out weighs the upgraded mounts for me. That's good if the 2004 mounts are stronger!
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Old 10-21-2003, 04:32 PM   #25
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The Perrin bar is also adjustable.
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