Quote Originally Posted by BLK JDM
I wouldn't say it takes boost pressure to seat completely. It takes compression, vacuum, heat, and other smaller variables to seat rings completely. Drive cycles with varying load and RPMs is what seats rings. This has to be done w/ a good tune for proper sealing. Pre-Igniton, detonation, running too rich, and overheating play a devastating role on rings sealing correctly. That's why you break a car in on the dyno whether it be turbo or N/A.
5.7 Tundra was the one who needed the complete explanation. I know the break in routine.