Newbie: Fiero ECM questions

[Ludis Langens]

TK wrote:
> 
> For those that have seen the Fiero SD code and it's brother the 85 Mass code
> (they were backups to each other should one fail EPA certification), it is a
> beast like nothing else. Both the tables and the program are different.
> Maybe the Fiero follows some older C3 carb code, but I've never seen
> anything that compares.

The SyTy / Turbo Sunbird code appears to be derived from the Fiero
6869/7170 speed-density code.  I haven't looked at the SyTy code all
that much, but every part I have looked at is almost a line-by-line copy
of the Fiero code.  

In the backwards direction, the 6869 code is related to other
speed-density programs.  The 6864 4-cyl TBI has a lot in common with the
6869.  Optimizations present in one but not the other imply that the
branch point is further back.  Perhaps the common ancestor is all the
way back at the (circa 1982) 5610 & 6026 ECMs.

-- 
Ludis Langens                               ludis (at) cruzers (dot) com
Mac, Fiero, & engine controller goodies:  http://www.cruzers.com/~ludis/