What this table is for
The Cut Pressure table is the threshold for overboost cut on a Nexus ECU. If boost pressure goes above this value and stays there for longer than the Delay time, the overboost cut activates. The delay stops a brief, harmless spike from triggering a cut. The table can be mapped in up to two dimensions, so the limit can change with another input rather than being one fixed number.
When you need it
On any boosted engine. Boost control keeps pressure on target when everything works. Overboost cut is the backstop for when something doesn't, like a split wastegate hose or a stuck solenoid. See boost control for the control side.
What to check
- The cut pressure sits clearly above your highest boost target, so normal driving never trips it.
- It's still below what the engine and turbo can safely survive.
- The delay is short enough to act before damage, and long enough to ignore momentary spikes.
- Your MAP sensor can actually read above the cut value.
Need this diagram? Ask us and we'll send it over with advice for your build.
