There is a wiki started on this mod as i am looking at doing this mod myself. It hasn't really been filled out well yet but it has a few useful links to threads and external link to some good info
Lean burn - EcoModder
Also when i have been researching i came across a graph which showed the cylinder temp compared to air fuel mixture. I cant find it now of course but i do remember temps going up with a slight increase but then decrease when going leaner.
I wonder does anyone know a good method to measure cylinder temperatures?
Can a temperature sensor just be put into the exhaust stream close to the cylinder?