isx cm871 overspooling

[Crash Dummy]

(09-04-2018 )marek4792 Wrote:  Usually when a turbo overspools/ overspeeds, it's always caused by a boost/preturbo exhaust leak and usually a check engine light will come on if the turbo speed is 150k+ rpm until you back off the fuel, are the cans completely hollowed or was it halfassed?

complete removal, straight pipes. had muffler put on after second turbo went, due to being too loud. No lights or warnings at all, first 2 turbos after head work, made a loud bang and smoke, this time no bang, just a whiz and smoke, loss of power.
Also had some oil in cac, and none in exhaust, first 2 times. Last time, had replaced all inbound oil and water lines replaced at last install, poured 2.5 gals oil from cac, and at least half to 3/4 gallon from exhaust.