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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 03-13-2008, 02:29 PM   #1
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GS Rear swaybar

Im going to be ordering one here soon and I was wondering what size I should be looking into. I believe that the stock one is 19mm correct? Does the GS 19mm one make that much of an improvement over stock, or should I look to maybe a 21 or 22mm. The rest of my suspension is stock (for now) and my car is going to be used mainly for autocross. Im also going to be getting myself a nice set of tires this year since I have a winter vehicle now. Hankook Ventus Z212s . Im probably going to throw on some poly bushings as well to allow the suspension to do its job more effectively. This will be my only mod for this season, if I do any more suspension work its going to shove me into the same class as the caged corvette, and I dont need a large reaming. One more question, the Vig uses a larger front swaybar correct? How much larger is it over the stock NG unit.
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Old 03-13-2008, 02:37 PM   #2
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I have the 22mm sway bar on my car and it was a drastic improvement improvement over stock. totally recommend it. I would think that if you are going to be doing auto cross as well as around town? 22mm should be good, although you could beef it up to 25.5mm but thats your call everyone likes the car set up a little different
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Old 03-13-2008, 03:15 PM   #3
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The 25 will be ok just remember on street tires it may try to swap ends.

Vig front bar was softer to get some corner exit traction and since they had stiffer springs to control the roll.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-13-2008, 03:18 PM   #4
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On my http://trolltuner.com site there is a longer writeup
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-13-2008, 04:47 PM   #5
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lots of good info there nick thanks!

btw... any news on that short shifter you were working on?
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Old 03-13-2008, 05:46 PM   #6
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Thanks for that link Nick, lots of good stuff Any more updates on those steering link bushings that are on the top of that page? That was another part I was going to have in my order with the swaybar, but I have not managed to find them on the site yet. Ofcourse it is very possible I just looked in the wrong spot too.
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Old 03-13-2008, 05:54 PM   #7
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I would start small, the 22, learn it, work on everything else. Since its an easy cheap mod, once the rest of the car is ready and you have the handling figured out, go up to the 25.
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Old 03-13-2008, 07:02 PM   #8
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i have the 22.5mm rear GS sway bar on my NG900 and noticed a world of difference it was the best money i have spent on my car since i bought it i think it was like $130 shiped and an easy instal 4 bolts and thats it, it is great on the track and havent had any problems on the street i would definatly recomend it, and i think the stock sway bar is like 15mm or somthing i might be wrong but i think i read that somewhere anyway it is puney as hell compaired to the 22.5mm one.
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Old 03-13-2008, 08:50 PM   #9
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I have 22 and I think I could probably go 25, but I dont want to end up on the side of the road in the rain.
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Old 03-13-2008, 09:09 PM   #10
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what all do you have done to your car that adding any more than a sway bar will put you in a class with a car that's like 4 classes higher than yours stock?
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Old 03-13-2008, 09:12 PM   #11
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I ran the 22mm bar for quite a while and loved it. After doing full suspension upgrades and getting used to how that handled, I stepped up to the 25mm bar and love it as well. Definitely makes the car a bit more likely to "swap ends", as Nick said, but it also made a pretty good handling improvement even over the 22mm bar. Personal preference, I really like the 25mm bar but everyone likes their cars set up differently.

I'd echo Tweek's advice - start with the 22 and see how that works for you before stepping up to the big leagues.
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Old 03-13-2008, 09:22 PM   #12
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What's the point in making a cheap mod more expensive? Buy and upgrade? Just buy the 25 in the first place.
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Old 03-13-2008, 09:25 PM   #13
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What's the point in making a cheap mod more expensive? Buy and upgrade? Just buy the 25 in the first place.
If I had gone directly to the 25, I could definitely see myself being surprised by the rear-happy tendencies of the thicker bar.
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Old 03-13-2008, 09:29 PM   #14
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If I had gone directly to the 25, I could definitely see myself being surprised by the rear-happy tendencies of the thicker bar.
I guess that's the difference between the guy that dives into the pool and the guy that dips his toes in.
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Old 03-13-2008, 09:30 PM   #15
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I guess that's the difference between the guy that dives into the pool and the guy that dips his toes in.
Yep.

one gets devoured by the pool-dwelling gators. One only loses a big toe
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Old 03-13-2008, 09:43 PM   #16
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Right now my car is entirely stock. This is for my autocross club events at college. We dont have the time available at the events to make a bunch of classes like SCCA does, so our classes are a little more compacted and can become mismatched. I will probably go with the 22 for now. I was reading on GS, and I thought I saw something about the 25 only being recommended with a fully done suspension, that it was too much for a stock setup. Im just waiting to see what Nick says about those poly steering bushings and then I'll get my order placed so my stuff will make it out in time for me to get it installed and put a little drive time on it before the season gets going.
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Old 03-14-2008, 04:48 AM   #17
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Right now my car is entirely stock. This is for my autocross club events at college. We dont have the time available at the events to make a bunch of classes like SCCA does, so our classes are a little more compacted and can become mismatched. I will probably go with the 22 for now. I was reading on GS, and I thought I saw something about the 25 only being recommended with a fully done suspension, that it was too much for a stock setup. Im just waiting to see what Nick says about those poly steering bushings and then I'll get my order placed so my stuff will make it out in time for me to get it installed and put a little drive time on it before the season gets going.
is there like only 2 classes? modded and unmodded? there's no way an almost stock saab should be paired with a caged vette unless that's his only mod. even then the groups would have to be pretty big.
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Old 03-14-2008, 05:18 AM   #18
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The steering rod bushings are one of the last parts to change.. I have a few sets just wanting to beat on the set in my car a little more before releasing.
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2.0 GOOSE 500whp + 8500rpm = 11.06 @125 E85
Viggen 439whp / 447tq 12.43 @114 on Gt2871.64, (Now 511whp Gt3076)
Nordic E85 9-3 SS Aero 320hp / 350ftlbs
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Old 03-14-2008, 06:58 AM   #19
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Dude all this talking about the GS rear sway bar is making go crazy. my dad is gonna bring a 22mm rear sway bar tonight after he gets off work he had an one laying around his shop. for my car and he didnt even told me about it. ima install it tomarrow on saturday morning with him omg. and since you guys say it makes a big difference of taking turns ima hella be taking hard turns and enjoying it. i hate driving my car with stock suspension cause it drives so shitty, i feel like im driving a boat with all this body roll way too much. does this sway bar decrease body roll and makes the ride stiffer? and more stable?

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Old 03-14-2008, 07:04 AM   #20
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The roll bar just stiffens up the rear, it wont ride much different but the steering will be a lot tighter
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