Nitrous brings extra oxygen, and with the extra fuel to match, the mixture burns faster and cylinder pressure climbs harder. Leave the timing where it was without nitrous and you're asking for detonation. That's why every nitrous stage needs timing pulled while it's active.
The Overall Ignition Correction table does that for one nitrous stage. It only exists once you turn it on for that stage in the Nitrous Controller node. When it's enabled, the correction is applied to every cylinder, and only while that stage is active.
How to fill it in
- The values are absolute, not a percentage. Each number is a number of degrees added to the ignition angle.
- Every value should be negative. You're removing timing. A positive number would add advance just as the engine becomes more knock-prone.
- It can be mapped in up to 3D, so the retard can change with RPM, load or another channel you choose.
Size the retard to the shot. Bigger jets need more timing taken out, and any change to the bottle, solenoid or jets means reviewing this table. Start conservative and add timing back only with good logs and knock monitoring. For per-cylinder fine tuning, use the cylinder ignition correction, and pair this table with the overall fuel correction so fuel and timing move together.
