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on 9000 or 9-5: is it "lbs over atmospheric" (ie the MAP sensor measures the difference against a port open to the atmosphere) or "lbs over a fixed setting" (ie MAP sensor measures boost against a fixed resistance, like a spring).
Seems to me that measuring boost against a fixed setting would prevent power loss at higher elevations (lower atmospheric pressure).
You could also gain higher boost by pressurizing the "open port" above ambient or putting in a stiffer spring.
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