Amplifying the signal from the coil assembly would fool the controller to think one was pushing harder on the pedals.
You also break into the chain speed hall sensor circuit and add an "electronic gearbox" that lowerered the sensed rotation speed.
That's not how it works Erik, it's a differential signal and not an amplitude signal that reads the pedal effort, hence the coil centre tap.
And there's no point in altering the Hall sensor circuit to read rotation speed differently when a simple change of rear sprocket on the bike or change of motor sprocket has the same effect.
Of course the differential signal from the pedelec sensor could be differentially amplified in theory, but in practice the signals are so minutely different and the reading so sensitive that such crude tactics would not produce a pleasant result, probably spoiling what was so good about these bikes.
Also relevant is how small and low powered the motor is, how it lacks cooling provision and is equipped with a temperature cut-out. Any extension of it's capability is severely limited.
I think a better approach is to scrap the present motor and mainboard, only reading rotation from the pedelec sensor and fitting a more powerful motor and conventional controller to the existing alloy crankcase. That would result in a better form of the Cyclone design.
.
