or there are other limits? I guess it needs to be in the same form factor, so heat dissipation will be the same. or, can I connect the VESC to an external board with fets? Thanks.
What is the application?
this would be more work than its worth… i think you can connect 2 vesc in parallel and get double current. still probably not worth the trouble…
electric skateboards 
I don’t think its possible, phase cycle need to be timed unless I modify the motor so it has 6 phase like this: https://www.youtube.com/watch?v=LgRK4_4ElhU
pretty sure someone was doing it on es for an ebike. 
same signal in, same resistance out…w.hat would shift it out of phase?
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50A already flings me up hills at 20mph…how much more current do you need? planning a trip to the moon?
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Would the vesc-x suit your needs?
It’s sporting these fets
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Need more amps with low voltage battery