What proportional gain does
In closed loop boost control, the ECU compares measured boost with the target and corrects the solenoid duty to close the gap. The proportional part of that correction is sized by the error: a big miss gets a big correction, a small miss gets a small one. This table sets how sensitive that response is.
The default table is shaped so the controller works harder when boost is far from target and more gently as it gets close. That lets it pull boost toward target quickly without shoving it straight past once it arrives.
The numbers in this table depend on the pressure units chosen in Preferences. If you change units, or copy values from a map set up in different units, the gains won't mean the same thing. Check before you paste.
How we tune it
- Get the closed loop base duty close first. Good base duty means proportional only has to correct small errors.
- If boost is slow to settle onto target, raise the gain a little.
- If boost overshoots or oscillates around target, lower it.
- Change one thing at a time and log boost, target and duty together.
Proportional works alongside integral gain, which removes steady leftover error, and derivative gain, which damps fast changes. For the full picture, see our boost control guide.
