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BMW 4wd cars are about 80kg heavier than the equivalent rwd car. The below system would be about 120kg heavier based on the part weights and significantly more powerful than a normal 4wd system with a normal engine.
I'd like to see a system with a front electric motor similar to the one at the front of the BMW i8 mounted in front of the engine. That wouldn't really work with an i6 as they are quite long engines so you'd need to stick with an i4 or v8 so you don't end up with a gigantically long car.
That would give you enough power at the front to get from 0-100 quickly with a powerful petrol motor sending power to the rear.
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