I have a motor with a cap soldered on there, it's a stage 2 rewound gen 1 motor and it actually performs better than my other rewound gen 1 motors. It's not necessarily faster as it is more smooth and responsive. I've been doing a lot of testing of different motors for my Fairlady Z drifter. I'm no electronics expert but those are just my conclusions from the feel of driving the chasis.
When I did test the motors I used the same brand batteries the same controller etc. that way non of that would be a factor in my testing. I wasn't really testing the capacitor, it's just I noticed the motor with the capaitor drove better than those with the stock ones.
Like I said though...I don't have an explainantion for that cause I'm not an electronics expert (im still learning though)
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