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So I talked with the shop again today. They confirmed that it was the sensors reading the rear hubs spinning the wrong direction that was making the ESC unhappy and they had to code it (the ESC it sounds like) for the 135i bearings/hubs.
It sounds like the encoder rings have an irregular pattern on. I don't know what that actually looks like dimension wise, but for example, if it's spinning in one direction the sensors reads "long pulse A" then "longer pulse B" and the computer determines the wheel is spinning clockwise. But if if it reads "longer pulse B" followed by "long pulse A" then the computer thinks it's spinning counterclockwise.
Suprgnat - You did the narrow hub conversion when you did your swap right? Does that use different bearings than 135i parts?
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