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Message: [QUOTE="The-Fett, post: 1087618, member: 14159"] I am driving the truck up from San Antonio to Gillett Wyoming. About the truck 2011 ccsb king ranch fx4 dpf off h&s box tunes and a 5 in exhaust. I noticed while passing someone in Gillett on the performance tune I'm only building 23 lbs of boost with rail pressure from 29 to 27.5 ksi. Where as in San Antonio I would build 26 psi boost with rail pressure at a steady 28 to 27.5 ksi range. What would cause the drop in boost? As I understand going up in elevation causes you to build more boost. what would cause 1000 ksi/psi change? Truck has new fuel/air filters. oil was changed about 2500 miles ago running 5w40 amsoil. I also use power service if that matters [/QUOTE]

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