Yes, Titanium alloy (i.e. Grade 5 - Ti6Al4V) can not be used in WRC and Rally Raid for mechanical parts as suspension parts.
FIA decided this just to keep under control the costs for mechanical components on these two series.
In my opinion, this is not the right way, because we need to consider always all factors that characterize the final cost of a mechanical part, not only the cost of the raw material.
Just an example: CRP Technology, in the past, produced Titanium cast uprights for Peugeot 206 WRC and now it is producing Steel cast uprights for another WRC Team.
Can you imagine what is cheaper? The Titanium upright! ;D
Yes, you understand well, because considering the rapid casting technology (Rapid Prototyping + Investment Casting), the main cost is not the raw material that is only around 8-9%. Titanium is very expensive when is used for "fabricated" parts (CNC machined and welded). On the contrary, starting from rapid casting and subsequent cnc machining, it guarantees an incredible quality/cost ratio!
Why banded Ti?...and is it the truth? 
Linear Mode
