Conedodger

It looks like your calculations are strictly based on the change in size, not the change in stiffness. I know there are calculations for stiffness based on size (No comments form the peanut gallery ), but I was never very good at math.

Also, there are two numbers in your stock dimensions. The factory bars are hollow. The second dimension is wall thickness. Now, there is even more math involved.

A 2

I wonder if Amazon.com will have a deal on this Ferrari book. I better talk to the lady that runs the used book store where I live to keep her eye peeled for any copies she may come across.

http://wheels.blogs.nytimes.com/2011...-in-price/?hpw

^ they do know how to market to their customers.

Conedodger

Found this info. Note that the stock sizes differs from what Doug found. I don't know which are correct

Eibach thread

S2000 Eibach Sway Bar rates:

Front: 32mm Adjustable (HOLLOW)
Pos.1 - 65 N/mm (368lbs/in)
Pos.2 - 73 N/mm (416lbs/in)
Weight - 4.8kg (10.6lbs.)

Rear: 29mm Adjustable (HOLLOW)
Pos.1 - 90 N/mm (515lbs/in)
Pos.2 - 106 N/mm (605lbs/in)
Weight - 4.9kg (10.8lbs.)

I was able to search the forums for OEM sway bar specs for comparison:

OEM S2000 Sway Bar Information:

AP1 100 series-
Front sway bar part number: 51300-S2A-003
28.2mm (HOLLOW) with a 5mm Sidewall
Rating at 61.6N/mm

Rear sway bar part number: 52300-S2A-013
27.2mm (HOLLOW) with a 5.3mm Sidewall
Rating at 73N/mm

AP1 110 Series-
Front sway bar part number:
51300-S2A-J01
27.2mm (HOLLOW) with a 5mm Sidewall
Rating at 53.6N/mm

Rear sway bar part number: 52300-S2A-013
27.2mm (HOLLOW) with a 5.3mm Sidewall
Rating at 73N/mm

Using this information, the differences calculate as follows:

Eibach front in position 1 is 21% stiffer than the late AP1 bar
Eibach front in position 2 is 36% stiffer than the late AP1 bar

Eibach rear in position 1 is 23% stiffer than the late AP1 bar
Eibach rear in position 2 is 45% stiffer than the late AP1 bar

This would lead me to believe that the eibach bars in position 1 would be closely balanced to the stock set up and position 2 would lead to oversteer. With the combination of four adjustments available, it seems like you could find a nice balance with the eibach package.

Triple-H

Math WILL NEVER be a final analysis and getting all specs that are verifyably correct is virtually impossible, it can only be a guide, an insight of what might be, suspension tuning is more a black art than a precise mathmatical equasion, so yes, my figures are only an indication of likelyhood, but they are better than nothing.

And yes, have fun with that spelling

Triple-H

Exactly, now how do you know 1,000% which is correct...
As I said before, 1-mod at a time
If you are determined to do both at the same time, go for it

Triple-H

I have them on my car, I don't need to do any research, I know the car feels almost exactly the same, just a tad stiffer, and stiffer means it is a bit more senseative to inputs that are not really, really smooth. It has not changed the balance to any large degree. If there is any change it has very slightly increased oversteer, but that's hard to confirm 100% because I had to change tires/wheels as the old rear Hankooks were balder than bald, and now with the r-comps, it just sticks. Period.

I did as much investigation as I could prior, spring rates were changed a bit as I recall, but not much.

Everything I read from virtually everybody that had them was posative, in addition I put them on my CRX-Si long ago and have always been pleased, that alone was enough to make my purchasing decision.

Triple-H

I checked the math and came up with the same percentages
If, and I say if, those specs are correct, I would agree with some playing around you should be able to get a fairly decent proportional increase accomplished
And, as I said before, I still believe in the rule of 1-suspension mod at a time

Conedodger

Agreed. I'm thinking that Eibach put some research into pairing their sway bars to their springs. If they kept the balance of the springs close to stock, I tend to believe they did the same with the sway bars. I'm tempted to give them a try. It is sure to be an improvement on the street over the Gendron bar that I'm currently running. Now that I won't be autocrossing with 245 r-compounds on all four corners, I don't need the Gendron bar. I can sell it, buy the Eibach bars and have a fair amount of money left over.

Conedodger

You have already tested mod 1, the Eibach pro kit, and found it well balanced. Maybe it is my turn to test mod 2.

Triple-H

Only other thing I got is this
I have used Autoanything a lot over the years, and I have always been pleased with their service, and I don't recall ever having a problem with them