call me crazy, but the high-revving EcoBoost V6 TT may have some great benefit from a carbon-fiber driveshaft...
any thoughts? crazy?
Carbon Fiber 1350 Driveshafts
Carbon Fiber structures are EXTREMELY sensitive to impact/shock damage. You would absolutely not want a driveshaft made from full CF. It would last only as long as it took for it to catch a piece of road debris or smack against an rock while off road, and then it would come apart like a light bulb. Great for weight savings, but requires very gentle handling.
Sticking with a strong, light-weight metallic, Titanium would be the best choice, but it's base material cost is several times that of most other steels, and it's harder to manufacture/machine/weld.
I think we'd want something ductile enough not to be brittle, with the best possible strength to weight ratio, yielding the strongest possible driveshaft in the smallest possible diameter.