About idle ignition control at the time of cranking.

[GRS]

Model: MX5 G4X
Roadster NA

I want to delay the ignition timing when cranking with a high compression engine.

However, it does include idle ignition control and the specified BTDC 10 degrees will be displayed in the log.

I tried to lock the idle detection with the MAP value, but the cranking MAP value is not stable and may turn ON / OFF.

Is it possible to cut idling detection only during cranking by using an engine operation timer etc. during cranking?

[Adamw]

During cranking and for the start up delay the ecu will use the idle ignition target as the commanded timing.  You can lower the target if you need low cranking timing.  

[GRS]

thank you for your reply.

Does changing the ignition target change the idling target?

When idling ... BTDC 10 degrees.
At the time of cranking ... BTDC 0 degrees.

This is my hope.

[Adamw]

The target will effect both cranking timing and idle timing.  Typically an engine will require the same amount of advance for good idle as it will for cranking.  So if it needs 0°C for cranking then it should idle well at 0 also.  

If not then your best option would be to turn off idle ign control and set up a 4D ignition table to do the idle timing - similar to how the idle ign table used to work in G4+.

[GRS]

thank you for your reply.

I understand the advice.

I will try that method.