Does anyone know of a site or link, that tells ALL ABOUT automotive helical compression coil springs(suspension's coil springs)?? I want to read about , spring manufacturing methods & technology, differences in spring rates and how one is made to a spec, differences in how they are hardened and/or quenched for different applications, if springs lose their springs rates over time & use, and everything else about coil springs in car suspensions.

I have been searching but not really seeing what I'm after.

These guys wrote the book on spring design.

Many good articles to be read there, here's one on the basics of making the wire.

Thanks shifted.