Indeed. As explained by Wurz, the management of the hybrid system is very complicated.
Quote:
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It is phenomenal, extremely powerful. Four-wheel drive allows us to accelerate better; it feels like a rocket ship! But an important reason to go to four-wheel drive was to recover more energy under braking and that works extremely well. Developing a four-wheel drive hybrid car is complex, not only because you have to recover energy front and rear but you also need to control the energy release depending on the speed, the corner and the state of the car. Every detail is important and I enjoy working like this.
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source:
http://www.toyotahybridracing.com/to...rward-to-2014/
For instance, on worn tyres the release rate is probably very different than in qualifying mode.