[Diy_efi] Datalogging with knock sensor

[David Allen]

  I've been playing with my new 'toy' which is a wideband datalogger.  My AFR is now very close (after some logging and tweaking) and I want to start tweaking the spark timing.  When I started this project I copied and pasted in a "stock" 2-bar sy/ty spark map into my ECM and it runs quite well.  However, there are a few pingy spots at part throttle.
  My ECM does not have a knock sensor and this function is disabled in the calibration.  (I do plan to use this feature eventually.)
  I was thinking about getting an appropriate knock sensor and interface box (the thing between the ECM and knock sensor) for my engine block.  Then logging it with MAP and RPM to look for the areas with detonation; so I know where to edit the table in the ECM.  My ECM has the old slow ALDL which is poor for real-time logging.
  Has anyone any experience with this?  
  Thanks for any ideas!
David