Once engine speed climbs past the Max Cranking RPM, the ECU treats the engine as running and leaves the cranking ignition angle behind. The Post Start Correction table lets you add or remove timing for a short period after that handover. It's enabled by default.
How it works
- Values are in degrees. A positive number advances timing by that amount, and a negative number retards it.
- The table can be mapped up to 3D. We usually map it against Engine Running Time and Coolant Temperature.
- The correction should taper to zero once the engine has been running a while, so it hands control back to your main ignition table smoothly.
When we use it
A little extra advance right after start can help a cold engine hold its RPM while the idle control catches up. On the other side, some engines flare too high right after firing, and a touch of retard settles them. Keep corrections small, make the fade gradual rather than a step, and use more correction when cold than when hot. Then check logs of several cold and warm starts to see whether RPM behaves consistently.
Pair it with the fuel-side post start correction and the coolant temperature ignition correction, and see ignition corrections for the rest.
