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FET (cant remember what it stands for) is the electronic piece that controls the motor - they can only handle a certain amount of current then they will cook - basically the esc (electronic speed control) of the xmods board
i only know of them from mini z - some motors for mini z require a FET upgrade or an external turbo (speed control) - i got a fet upgrade from NML's associate for my mini z overland monster truck - it consists of 4 higher performance FETs in a 2x2 config - you have two FET's - one for reverse and one for forwards - 2x2 is two stacked FET's on both forward/reverse - i had to do it to get the S02 to work, it pulls more amps than stock can handle. its also faster all around (almost too fast)
i dont know what FET rat shack uses but i doubt it can handle much - but i dont know
if NML didnt do an upgrade to run his motor then maybe i can get away with an S02 - thats why i started this - the xspeed is really fast and torquey
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