[Diy_efi] Datalogging with knock sensor

[Mike V]

Hi David,
you mention the SyTy code and slow ECM logging.  The Typical rate I've seen
from a 7749 SyTy ECM is around 4 frames per second.  Are you using a 7749?
Also, which logging software are you using?
The logs should allow you to roughly determine at which MAP & RPM
your spark knock occurs.  Close anyway..
MV


At 07:22 PM 11/23/2006 -0600, you wrote:

>   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