[Silver69Camaro]

I've tried to get some E numbers with limited sucess.

What I have found out that these tend to have more torsional stiffness than a comparable leaf spring, so consider that when calculating anti-roll bar diameters. On the other hand, lateral control of the axle is less than steel...but there's more to it than that.

First, in my case, I'm going from a spring with a 6" arch to 4.5". Reducing the arch shortens the moment arm that acts against the spring...causing it to twist and therefore lateral axle movement. Second, first gen Camaros have pretty good leaf geometry (tapered in front) which again increases lateral stiffness. If the geometry weren't as it is, I'd probably have to add a panhard for sure.

Back to the modulus question. Steel is easy, we all know that one. But, for the composite, it's way more complicated and I couldn't just compare the two numbers. The E in one direction (bending) may not be the same in another (lateral), depeding on the layout of the matrix material. Sheesh, I wont even try to compare two different brands of composite springs if the binders and fibers are different. Ah, aren't composites fun?

In the end: I'll just have to run them to find out and add roll stiffness (or remove) to suit...then I can make a comparative analysis between steel and "other" leaf springs. If I need to had a lateral locator, no big deal. So far, others haven't needed to. Should be interesting.