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Power Strokes
7.3 Aftermarket
Turbo sizing for compounds
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[QUOTE="Charles, post: 1528334, member: 103"] Yes. That's fail SAFE. Another option is to run the same spring pressure (lower than desired boost) And then use regulated air on top to bring the desired boost slightly above your target when the bottom port is disconnected (and I emphasize slightly...) and then use a hallman controller to bring pressure to the bottom port to pop the gate open right at desired boost. This is an all manual, non-electronic control scheme that is highly reliable, super fast to boost and still largely failsafe in that if you blow the line to the bottom port you only overshoot by the amount you dialed into the regulator on the top port. This also lets your "spring" basically be an airspring that you can infinitely adjust by changing the regulator setting to the top port. I ran that setup for quite a while before running the 4 port solenoids off my PCS controller. The solenoids were similar in speed and control to the regulator/hallman combo but lacked reliability. They would get clogged with the inevitable soot blowing back down the lines and would have to be oiled and replaced from time to time. Usually a couple years or so of daily driving, so not bad, but the manual stuff seemed immune. The electronic control could get to desired boost faster, and stay dead on desired boost, but required very accurate tuning tables and something on the truck to actually run them obviously. The manual stuff was nearly as quick to boost, and pretty damn good on staying put throughout the rpm range without much bs. [/QUOTE]
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