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Yeah. That is the general rule of thumb. So if you can run 7 psi on the spring with the MBC open then 18.5 is where it will open with the MBCclosed. There are other things to consider though. What turbo are you running. Can the wastegate flow enough to keep that boost pressure from creeping. You can also use the top port on the tial and get more boost. This takes alittle more time to get right. The info is all out there my friend.
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