What it's for
Nexus transient throttle enrichment is built from several amount tables. The Overall Trim on this page applies one final percentage change to all of them at once. Raise it and every throttle hit gets more enrichment; lower it and every hit gets less. It can be set as a single value or as a simple 1D table.
When we use it
It's a diagnostic lever. If a car bogs or goes rich on throttle changes, we move the overall trim up or down and see which way the response improves. That tells us the direction before we spend time in the detailed enrich and disenrich tables. Once the underlying tables are right, the trim should go back to neutral, so it isn't hiding a problem.
What to check
- The trim is back at no change when you've finished tuning.
- The steady-state fuel map is correct first.
- Coolant temp correction isn't what's really causing the issue on a cold engine.
Need this diagram? Ask us and we'll send it over with advice for your build.
