You would need to check your paperwork for the SP system, as to whether it will detect a brushed motor and if so, how you wire it up. I can only comment on the Tekin system, but you wire all three phase poles to the motor negative, and the positive to the ESC positive, but you must ensure the ESC is set to BRUSHED.
As for motor limit, I don't know
7.5, I would say, is a good 11 turn maybe.
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