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i got a 66mm turbo too, i only seen 30 lbs of boost on the dyno and normaly see 40 on the streets, the kid running the dyno loaded it to 100% as soon as i told him i was ready i dont htink he ran they dyno right.
Sounds like you never got on top of the turbo. You may have to use the brake to build enough resistance to spool the turbo, then let off of the brake before you start your "run".