The fuel Gear Correction table adds or removes fuel depending on which gear the car is in. Each gear gets its own complete 3D correction table, which is why NSP treats it as a 4D table. To edit one gear, use the slider to pick that gear's "slice" and tune it like any other 3D table.
Why would you need it? Load and airflow can behave differently in each gear. Lower gears build rpm fast, so the engine spends little time at each point, while top gear holds load for longer and can run hotter. Gear correction lets you trim mixture for those differences without distorting the main fuel map. It's also useful on drag and road race cars where the tuner wants a bit more safety margin in the gears with the longest pulls.
Before you use it, make sure gear detection is reliable, because a wrong gear reading applies the wrong slice. Check the logged gear channel matches the real gear across a full run. Then change one slice at a time and confirm the result in your logs. The gear detection and fuel corrections pages have more.
Need this diagram? Ask us and we'll send it over with advice for your build.
