I am starting to play with my DME ('97 993 Euro Vario Engine). I am doing this just for fun. I would like to learn as much as possible about how the EFI works and eventually be able to do some changes in the programing myself. I know this is a very complicated issue...which makes it more fun!!
So far I did some (a lot) of research on the Net (including this forum), bought some books, some of which I still have to read, but I am feeling that I am learning a lot.
I was able to get some info from a couple of Performance chips that I have for my 993, and tomorrow I plan to read the stock Eprom, to see the difference.
Using some of the demo versions of the tuning softwares, I was able to identify some of the Fuel and Timing maps on the "sea of data" coming from the EPROM. Please see graphs below.
My questions in this opportunity are:
-how can I get the units for the different axis on the graphs?
-how can I conver the hexadecimal (or decimal) info coming from the EPROM in actual Fuel Trim value (lambda) data? Is there a specific formula for this? I tried to play with some formulas, but it seems that the relationship is not linear.
I would appreciate any help on this quest for knowledge. So far it has been great fun!!
Any comments on the differences between this two performance chip maps are very welcome.
Thanks in advance,
