Are you using V7 or V8 pass-thru logging?
Or are you using Black Box standalone logging?
When using V8 pass-thru, please save a trace file* after attempting to log about 2-3 seconds of data that shows the incorrect MAP scaling.
Send the *.htx trace file and the *.pld log file to me at paul@efilive.com
* Save the trace file using the EFILive Control Panel->[F8: Trace] option.
Regards
Paul