you better recalculate, you're off by a country mile plus some on that RB rate, better yet try Search, been discussed in detail in the Competition area

I still say they're not worth it and certainly aren't the only ones winning well, but it's no skin off my back ...

 

well last time i opened one of my M.E. books the stiffness aka twist in degrees /(torque*length) of a thin wall tube was something like 1/((PI/2)*((rad outer^4)-(rad inner^4))*material constants) * (180deg/PI radians)

...so plugging in the advertised numbers thats what i got

 

I did the calcs a while back, and came up with the "J" section inertia value for the RB front bar as being 2.5 times that of the stock bar (rear was abotu 2 times stock, although the shape differences probably make the RB bar more of a stiffness increase over stock than just cross section would indicate).

I'm not sure about the accuracy of the dimensions for the stock front bar that I was using, and just ratioing the stiffness based on section values assumes that material, overall length, and distance from bar centerline to end link lugs are constant between the two parts.


regarding just one bar upgraded, I installed the RB kit (sways and coils) over 2 weekends - front first, and the car felt like a front-drive/front-engine car during agressive cornering in the intervening week.

 

you should have "got" 233%