For the round design the phase sensors ( outputs ) are each on the quadrant of that big 8 1/2" diameter capacitor. So, they are about 6" apart.
The boost input would be handled exactly like the outputs, so it would be about 6" away from any output. The input would be seeing twice the current (bigger field) for a 2X booster.
I would guess that 6" should be sufficient for not needing any shielding, but these are the noisiest wires in the car. I don't know about the sensitivity of other parts of the controller; it just seems like a "better safe than sorry" situation.
- E*cipse
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