What the table does
The Overall Fuel Correction table adds fuel to all cylinders while its nitrous stage is active. It only does anything once you enable it in the Nitrous Controller node, and you can map it in up to 3D.
It's mass flow, not percent
This is the part that trips people up. Most fuel corrections in a Haltech ECU are percentages of the base fuel. This one isn't. It's a mass flow rate, an amount of fuel per unit of time, added on top of what the engine is already getting. That suits nitrous well, because a given jet flows roughly the same nitrous whatever the base fuel is doing, so it needs a matching amount of extra fuel.
The table can show grams per second, kilograms per hour or pounds per hour. Change it in Preferences > Units Options with the Mass Flow setting. Pounds per hour is what most people use, and it lines up with how injectors are usually rated in the US.
Tuning tips
- Start rich and lean it out in small steps, watching lambda for every cylinder you can measure.
- Pair it with overall ignition correction; nitrous nearly always needs timing pulled as well.
- On a wet system, remember the fuel solenoid is adding fuel too, so account for both.
For closed loop targets during a stage, see nitrous target AFR correction.
