101 clarification

[steve ravet]

Light is slowly dawning.  Between Ludis' disassemblies and Bruce's
emails, I'm getting this 747 thing figured out.  It's starting to light
a fire under me to convert my '78 monte carlo to EFI...

I have another question for the 747 gurus.  I'm adding Bruce's
description of how to convert table values to real world values.  He
wrote, in part:

Spark Advance
      data byte *  90/256);     (This give 0-90 degress)

Bruce, in your tuning tips table you had some negative values in the
spark table.  How does that work?  Also, this is a newbie question, the
0-90 value is before TDC, right?  ie a value of 30 means 30 degrees
BTDC?

thanks,
--steve


--
Steve Ravet
International Meta Systems
http://www.imes.com
steve at imes.com