ignition timing during off throttle decel

[shind3]

Can you guys expose this table? I noticed a rough transition in my car is due to a rapid change in ignition timing between on and off throttle. When deceling off throttle, the timing drops down to about 23 degrees but applying very light throttle just enough to make it come out of 'idle mode' makes this jump up to 37 degrees. This is very noticeable.

In the Subaru world, I set this to the same value as the very left of the timing table so the transition between on/off throttle is smooth.

Thanks.

[Hondata]

I do not believe this is from ignition timing, but rather from the injector restart, unless these two events occur at different times. Post the calibration with a comment where the transition occurs.

[shind3]

It's a completely stock calibration. I haven't received my Hondata yet but I'm logging timing through an OBD2 logger.

Both the injector turning on and ramp up in timing occur the moment the throttle pedal is increased enough to come out of decel mode when above the fuel cut RPM. Injectors turn on and timing goes from 23 degrees to 37 at around 3000RPM. There is a table that defines what the ignition timing is when in off throttle decel. During this, the main timing map is ignored and a lower value is used to aid engine braking.

[shind3]

OK, got my FlashPro and datalogged what I'm talking about. You can see both the injectors coming on and the ignition timing shooting up once you come out of overrun mode.

[Hondata]

The lower ignition timing is not used for engine braking; upon overrun it doesn't matter what the timing is. The jerk is from the injectors restarting.

[shind3]

Ok. Thanks for your input. I won't worry about it then.