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Message: [QUOTE="SpartanDieselTech, post: 1281050, member: 22311"] Changing vane position (feedforward) will not actually change your boost levels, only the response rate. These turbos are a feed-forward, closed loop system. The desired pressure is the pressure the system is looking for, and the PID controller will alter the feed-forward to find the setpoint at a given RPM and Torque setpoint. [url]https://en.wikipedia.org/wiki/Feed_forward_(control[/url]) [url]https://en.wikipedia.org/wiki/Control_theory#Classical_control_theory[/url] Changes to the feedforward tables need to accompany a similar change to the desired pressure tables. More desired pressure without extra feedforward duty cycle will get you an increase in manifold pressure, but the response will be slow. Too much feedforward duty cycle will not get an overall increase in manifold pressure, but will make the turbo overreact (and surge/fluctuate or overshoot the setpoint). There are a LOT of tricks that can be played with this for performance purposes, including getting more boost out of the truck in lower gears (lower overall load) without overboosting the truck at high load/higher gears. [/QUOTE]

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