Tuttle
Technical Art Director - Env Lead
All I know is that it was pretty much widespread across the F1 paddock that Ferrari had one of the weakest simulators in all of Formula 1; that has obviously changed now and it's so cool to see Ferrari going with rFactor Pro.
I think you're confusing the simulator with the wind tunnel. AFAIK the Ferrari simulator was one of the most complex and expensive in the F1 area. I think they're switching mostly because a better tire patch/terrain physics combo. I remember Montenzemolo complaining because of the bloody expensive (6 Millions $) investment for their simulator, instead re-introducing real tests...canceled for budget savings.