Paul

You mentioned you are having a problem with over richness at idle,
reading back through the different postings you didn't say if you were
using Tracy's 2/4 injector method or if you are trying to turn down 4
fire hoses so to speak.  I just thought I would throw this on the table
as sometimes it's the obvious that can get overlooked, and hopefully I'm
wrong.

Tony2

Yes I am using Tracy 2/4 injectors system.
Up until MAP 15" Hg Tracy fires only two injectors. After MAP 15" Hg Tracy
backs off the pulse width of the first two injectors and brings
the next two injectors on line with a pulse width calculated for all four injectors
to provide the same amount of fuel. After MAP 15" Hg both sets of two injectors
are the same pulse width and are increased as the manifold air pressure continues
to rise. I am in the process of changing the rate, on the test bench, these pulse
widths are increased to richen the mixture on the top end.

Paul Lamar