| something about this isn't making sense. In order to eliminate a variable why don't you manually power off your boost controller and then go see what your max boost is. If it is still 20PSI with the boost controller turned off something is wrong. When your boost controller is turned off your stepper motor should allow for a 1:1 ratio of air coming in to also exit and hit your waste gate. So if your plenum sees 15 psi that's what your waste gate will see.
Madhatter10-6
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