The DBW Close Rate Damping table sets how much damping the Nexus applies to the drive-by-wire throttle while it's closing, as long as engine demand is 2.5% or more. Set it to 0 to turn damping off. The maximum is 10.
Why damp the closing throttle at all? Snapping the throttle shut can make a car jerk as the drivetrain unloads, and on turbo engines it can make transitions harsher. A little damping smooths that out. Too much makes the throttle feel lazy when you lift, and on track it can hold power on for longer than the driver wants.
We start with little or no damping, then add it in small steps only if the car feels abrupt when lifting. Check the result in a log with pedal position and throttle position side by side. The throttle should follow the pedal down smoothly, without lagging far behind it. Opening behavior has its own table, DBW open rate damping, and the full setup is in drive by wire.
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