nader wrote:Can someone educate me about the possibilities of a motor upgrade in the future? I know Nissan is making their own motor so it's unlikely that some aftermarket motor will just bolt right up. Aside from fitment issues what are some of the limitations of the existing setup? Is it as simple as swapping in a higher KW motor and reprogramming the controller? I recall hearing something about pack voltage being a limiting factor for increasing power output. Please educate me.
The electric motor and battery work together much like the mechanical displacement parts of an engine (pistons, valves and crankshaft) or "electric motor" in an EV and the energy feed / flow parts (fuel injection / carb / blower / turbo coupled with the exhaust) or "battery" in an EV. You may be able to push more energy through the electric motor with a larger battery and inverter but simply putting a larger electric motor and not supplying the additional battery power (not size of the gas tank) will probably be disappointing. Now adding a second battery in parallel or series with the corresponding inverter and electric motor would offer the ability to increase performance. It could be accomplished with a booster battery (in series) and upgrading the inverter transistors (IGBT or MOSFET) to drive more power into the existing "electric motor" - i.e. turbo charge or blower on an ICE.
Another way to look at the power system is to consider a different way to upgrade an ICE. For example, when upgrading a 4 cylinder car engine, why not just add four more cylinders and use the existing fuel / air intake and the existing exhaust system? This is what replacing only the "electric motor" in an EV seems like to me.