ebike11 said:
Do larger shunts allow for more power? Increased top speed?
No. A shunt is one way to convert a current signal, using a known resistance, into a voltage signal, which can then be measured to compute the current flow. In high voltage AC applications, current transformers and voltage transformers are used to do the same. The cycle analyst or controller uses that information to set current limits. For the controller, changing the shunt resistance, without modifying the circuitry that receives the voltage signal, is just fooling the current limiting circuits of the controller into thinking less current is flowing, so the circuit allows more actual current to flow. For the shunt the CA uses for monitoring, you need to adjust the shunt resistance in the setup, in order to obtain an accurate current (and therefore power) readings, but won't affect performance. There would be no reason to change the CA shunt, unless you are flowing so much current past the rating, to render the voltage signal inaccurate (since it will heat up, and resistance with rise).
If they CA is using the same shunt signal as the controller, then modifying the shunt can fool the controller circuits to allow more current to flow, but you'd want to adjust the CA settings in order to get accurate readings. Is that your goal, or just to ensure the properly sized shunt for the CA?