To be honest, I wouldn't think that was too bad. There are twp things that I can see though.

  1. Delay between the commanded AFR anf the WB AFR:
    At throttle close, the air speed through the motor will slow down, so the WB signal will lag the rest of the engine parameters. The mount of lag is determined by the position of the sensor. Obviously, the further away from the motor it is, the more lag will be present in the log data. So this probably isn't a huge issue and I'd not be overly worried about it.
  2. Slight richening of the WB AFR signal on throttle close:
    In the E38, this is controlled to some degree by "Wall Wetting Asymmetry Factor". Low values in this table add less fuel when the throttle is closed. Again, your log only shows a very mild increase in richness.

To really work on dynamics, you need to look at...
  • RPM
  • MAP
  • TPS
  • Airflow
  • Inlet Valve Temp. ( though this can be guesstimated for systems that don't have this PID ).




Simon.