other verts are not as rigid and are usually, much heavier than the s2k.

 

I think what you are feeling is the suspension flex. We have independent suspension with light spring rates that will give the illusion of body flex when in reality the structure of the car itself is very firm! Also if you have changed the wheels and tires, they too can sometimes induce a wrong camber and feel like the body is "walking"

 

I do notice it but it's a lot better than other convertibles. I had an old BMW convertible and that thing shook like crazy whenever I hit a bump.

 

If I recall the S2000 structural rigidity is 57000hz. The only other roadster out there greater was a ferrari when it was introduced.

fltsfshr

 

most likely the twisting that you feel is the stiffiness of the springs, specifically the rear being too stiff.

The s2000 is a ground up convertible, not a convertible made from a roof car. so the frame has to be a lot more stiff to handle not having the roof structure.

There is no problem with the frame. The frame is one of the stiffiest compare to other frame designs. However, the problem will be not having enough give in the suspension components that's trying to twist the car.

I felt all that as well, until I put a slightly softer springs on and everything seems to soften up a bit without losing the rigidity of the body structure.

but that's just me. Honda's too cautious, they will always put 30% safety margin for the things they engineer.

 

If you run a search on here, you'll find lots of argument that neither the xbrace or the stb have any effect at all on the rigidity of an S2000.

I think you have another problem either in your suspension aligment or tires.

fltsfshr

 

Mine seems just as rigid as my RX8, which is nice considering the drop top compromise.

 

Wonder if you're feeling something else, like bump steer. That may feel weird going over bumps. Can you feel the change in the steering wheel.

 

Torsional and longitudinal rigidity of cars has improved greatly over the last six or seven years. Technologies like high strength steel, hydroforming, etc. have resulted in new models being 50, 60, 70% more rigid (at least according to manufacturers.)


Considering the age of its design and engineering and the fact that it IS a drop-top, the S2000 is remarkably rigid. The real give-away is cowl shake. I have noticed almost none in the S2K over the absolutely awful post-katrina streets and roads down here.

If you think your car lacks rigidity, go try a 'vette.

 

I agree with Nate - lifting the rear tire when jacking up the front indicates good torsional stiffness. If you jacked up my old Alfa Giulietta with a door open, you couldn't shut the door!

Also, the S does just feel stiff to me when the road tries to twist it - I don't get the impression described by the OP.