Hi dameetz,
Turbo function is useful in Mod class also. If using other speedo, when you turn down the motoring timing to save power and gain better corning, you will lose straight line speed. If you turn up timing, it will consume more power and over power in corner (always under steer since too much power).
If using RB50, you can have smooth corning and high straight line speed at the same time !! This is the soul of our system and design concept.