I see a target value for my ignition timing when idle control is active. I don’t have a PWM or Stepper or DBW, so no control over air flow and am using the timing control to reign in or ramp up my idle speed as needed. Honestly it works really really well, but I’d love to get the timing up a little bit when warm, I have a feeling its creating some big EGTs since it is having to retard timing down to 0° or lower to hold the rpm down. Usually the target timing is around 6° btdc. I’m trying to understand where that value is coming from. It doesn’t seem to be anything I can set in a straight forward way. My base table is set at 15-17 at idle. I understand that I can adjust my throttle plates down to get the idle timing back up, and will. I’m mostly just curious where this target number is coming from.
U have a table for highest torque angle and a table for max correction limit. So there is a min angle resulting. The target angle is right inbetween.
Those are my settings for example:
Very interesting. I still need to dial in those tables. I haven’t messed with them much, idle fine adjustment has not been a big priority as of yet, since the more or less default settings do the job pretty well.
If ignition timing is lower then you want it to be, this is because RPM is higer then the target.
so it lowers the angle to hit the target rpm. If you want more ign angle you need to lower the air flow manually.
Yeah, I get that. It’s just a balance between cold idle and hot idle. Right now the throttle plate setting gets me both with timing doing the majority of the work. So as I said, the system works really well at keeping the car idling. I mostly just wanted to understand where the “target angle” value comes from since it’s a target value that I didn’t choose directly.
