Originally Posted by oneginee
KERS is far from being a well matched solution to turbo lag. I see it as a new dimension in driving more like a Nitro boost. The storage of extra energy takes time to replenish. There are potential issues also with torque effects on the rear axle as the device becomes saturated and cannot accept any more braking energy. The step change on the axle load could make the car unstable under braking. There’s an awful lot of work to do yet just getting the first generation of devices safely up and running. If they use a battery to store the energy it is going to increase weight, etc...
Correct me if I'm wrong, but these cons you mention are all related to a flywheel/mechanical KERS (Torotrak). BMW is favouring an electric system however which I agree will add weight.
Best regards, south