For my rebuild I had new stationary gears and bearings, new housings and seals, but the old rotor bearings. The shop (Kearney Racing) had me do the fast idle break-in for several hours ( I think they wanted 6 hours total). We then took it to a test and tune day and broke it in by gradually increasing rpm and applied power. Total break-in was about 5 hours of varying speed fast idle, and then 1.5 hours of track time.
I know of one guy that ran his in a street car for 1,000 miles to break it in, and another that throw one in at the track and broke it in during qualifying. Both motors lasted fine.
Warning- non-expert opinion follows: If you can break it in right I'd do it. If not then I would do the fast idle thing per the Mazdaspeed instructions, then take it easy in the beginning of school.
Kevin Bailey
ITA/IT7 WDCR
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