This is Swift Springs from Ontario, California.

We would like to clarified some information in regards to our sway bars.

I understand that there are some mis conception in regards to our front sway bar % on our PDF file. But I can gurantee that the data that will be listed will solved all issues.

Lets start with Swift Sway Bars Data:
Front Sway Bar-
26mm (SOLID)
Rating - 53.6N/mm
Rear Sway Bar:
27mm (SOLID)
Rating - 82.5N/mm

Here are some OEM Honda S2000 Sway bars data:

For the AP1 (There had been 4 different combination changes in terms of sway bars)

We will list the different Series from early models to late models:

Lets start with 100 series-
Front sway bar part number:
51300-S2A-003
28.2mm (HOLLOW) with a 5mm Sidewall
Rating at 61.6N/mm
Comparison to Swift Front Sway bar-
87% of the OEM Sway bar = 13% decrease then OEM Sway bar

Rear sway bar part number:
52300-S2A-013
27.2mm (HOLLOW) with a 5.3mm Sidewall
Rating at 73N/mm
Comparison to Swift Rear Sway bar-
113% of the OEM Sway bar = 13% increase then OEM Sway bar

110 Series-
Front sway bar part number:
51300-S2A-J01
27.2mm (HOLLOW) with a 5mm Sidewall
Rating at 53.6N/mm
Comparison to Swift Front Sway bar-
100% of the OEM Sway bar = 0% decrease and increase then OEM Sway bar

Rear sway bar part number:
52300-S2A-013
27.2mm (HOLLOW) with a 5.3mm Sidewall
Rating at 73N/mm
Comparison to Swift Rear Sway bar-
113% of the OEM Sway bar = 13% increase then OEM Sway bar

120 Series-
Front sway bar part number:
51300-S2A-013
26.5mm (HOLLOW) with a 4.5mm Sidewall
Rating at 46.6N/mm
Comparison to Swift Front Sway bar-
115% of the OEM Sway bar = 15% increase then OEM Sway bar

Rear sway bar part number:
52300-S2A-J01
27.2mm (Hollow) with a 4.5mm Sidewall
Rating at 67.6N/mm
Comparison to Swift Rear Sway bar-
122% of the OEM Sway bar = 22% increase then OEM Sway bar

130 Series-
Front sway bar part number:
51300-S2A-013
26.5mm (HOLLOW) with a 4.5mm Sidewall
Rating at 46.6N/mm
Comparison to Swift Front Sway bar-
115% of the OEM Sway bar = 15% increase then OEM Sway bar

Rear Sway bar part number:
Do not have
25.2mm (HOLLOW) with a 4.5mm Sidewall
Rating at 51.6N/mm
Comparison to Swift Rear Sway bar-
160% of the OEM Sway bar = 60% increase then OEM Sway bar

By reading the data, everyone can see what a huge difference it can be in terms of handling of your S2k depending on what model year it falls under. I do believe if you can provide any Honda Dealership with your Vin Number, they might be able to find the part number corresponding to your sway bar. (Not 100% sure!)

One more thing to keep in mind. When our engineers designed the Sway bars, they designed the sway bars as a front and rear SET! So therefore, the sway bar is suppose to provide a neutral setup. With just an addition of one bar, it might create excessive understeer or oversteer.

Lastly, Hollow sway bars will usually be lighter, solid sway bars will usually be heavier. That is not the determining factor for a % increase and % Decrease. The bend points on a sway bar will determine the Torison Rate % increase or decrease.

Also, On our PDF file. It specifically stated that is tested on an early model AP1 S2000. I think most S2000 owners knew of some minor changes that happen during the years. But I think the changes from Honda were more then we all had expected.

We hoped we offer some help to the S2000 community today!

Please call us at the office or contact us by email if there are any further questions.

Thanks!

 

Thanks for the data!

Unfortunately, I think a lot of people have been having problems on the track/autocross course with rear wheel lift. It seems like these packages, raising rear stiffness relative to front stiffness, in theory would exacerbate this problem. Has anyone had experience with the front/rear combination that can comment on what actually happens?

 

Again just to clarify:

The problem you are having is the inside rear wheel is lifting off the ground completely?


-If this is the case, I have never had this problem on any AP1 or AP2 car as of yet -with stock and aftermarket springs/dampers/swaybars combinations.

 

Yes. For instance, this year in I ran autocross in my A stock prepped car: Saner front sway bar (at +121% stiffness over stock), Koni Yellows, and Hoosier A6s as far as suspension goes. There was no problem with this car.

However, when my car was in the shop for one event we ran the Hoosiers on my co-driver's completely stock S2000 (so basically, more tire than suspension to deal with it). In this case, as soon as we applied the gas in the corner, we would actually get wheel hop. The inside rear wheel would have so much weight transfered off of it that when we went to apply power it would just spin. Obviously, stiffening the rear anti-roll would just make this problem worse.

This is not a problem with lower grip tires and it's not a problem in higher speed, sweeping corners. But it is a very common problem when you start moving to higher grip track/autocross tires and go through tight turns (slow turns on the track...every turn during autocross!). Just do a search in this sub-forum for wheel hop/spin/lift or check out the autocross FAQ to see evidence of others with the same issue.

 

i have swift coilover springs and anti-sway bars on my car and the setup is great. i've tried just the rear sway first, and its true that the setup is more balanced with both the front and rear swift sways compared to just having one or the other. The wheels in the front and rear stay more planted while cornering, and turn-in steering is much better.

 

Is there a spring setup that is recommended to be used with the sway bars for a comprehensive package? That would make a lot more sense to me.

 

[QUOTE=FormulaRedline,Feb 28 2008, 01:22 PM]Yes.

 

I've never actually seen it from the outside. Though I believe the tire actually comes of the ground at some point for a short periods, I'm sure that's just from the wheel hop once it starts spinning. The tire doesn't actually lift off the ground just from turning, it's a weight transfer/differential thing.

Either way, the rear end needs to be softer relative to the front to correct the problem. Hence the massive front bars we run in A-Stock. I'm wondering if Swift solves the problem by changing the spring rates instead of the ARB rates.

 

Im a big fan of Swift Springs. They do alot more R&D than most spring companies.

Heres alittle info on what makes Swift springs different:
Technology behind Swift Springs

 

The inside rear wheel lift is a big problem in the S when you use grippy tires and heavy weight transfer in an A/S S2000 at autoX.
I have the Saner front bar on custom 4th hole, Hoosier A6's 225/245, and OTS Koni yellows and I had wheel lift in the sweepers. The inside tire will lift off of the ground and when you apply any gas, the diff acts as an open diff and the tire off the ground will spin freely.

With stock front bar and 245/245 A6's, I can get the inside tire lift by the third cone in a 5 cone salom.