Engine Balancing
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It's possible it's the same issue, as I described. The twins also weren't able to bypass enough air around them, based on the wild restriction in the head. OP needs to confirm how bone stock the head is. Either way, on the setup, if the wastegate cant get boost eventually down to 12psi, there's an issue. Heck, maybe there's some sort of restrictor installed in the air line to the wastegate system. Slow to react to open, then when boost drops it's slow for it to go back down to close the wastegate enough. This doesn't explain why it can't get down to gate pressure though. I'd be testing the gate by slowly increasing pressure from an external air source and see how the gate moves. If he has the type of gate I think he has from his definition, the motion of it opening is non linear too which can cause issues with getting it to play nice.
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By Dose Pipe Sutututu · Posted
Post up a showing a a wide RPM range, wastegate duty, timing, TPS, MAP Use 2x rows if you can, easier to read the data. Or just send it to me
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