If I were breaking in new turbos, I'd start on a stock map and gradually work my way up to going WOT. Then gradually increase boost from there, going to a 12-13psi map for a few weeks, then 14-15psi for another few weeks, then if you want or used to run meth or e85 get into that after a while on the "lower" boost maps. I don't consider myself to be of professional caliber FWIW, the above just kind of seems to be more of a cautious common sense approach. I'd like to know too, because my wastegate rattle is terrible and the car has been pushed very hard on the same set of turbos for 77k miles now, so I'll be in the same boat soon enough.
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