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850T Wastegate And Tcs Question

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Hey guys, trying to get a handle on how the boost control system works. I put a hand pump on my wastegate actuator the other day, and the rod began to move at about 2-3 psi...so is it correct that the TCS opens at a specified pressure to allow pressure to the wastegate actuator , which will open with any pressure? Also, if i was going to do a wastegate adjustment, would i shorten or extend the rod? Id like to adjust the wastegate when i install my MBC, but i want to make sure i have a good handle on how everything works before i start messing around too much

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