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Just giving the car enough throttle to leave a stop drops the vacuum level enough to start to close the bypass valve and create positive pressure.
If you are set on doing this I would recommend removing the vacuum actuator and tying the bypass valve open with cable ties. It is the only way you're going to stay out of boost. In that scenario you will probably be in the range that the ECU can compensate as long as you stay out of the throttle.
But like everyone else said, spend the $400 and get the tune...
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