One nagging problem that I have is the engine running rich at low power
levels.  I've turned the fuel pressure regulator down to 30 lbs to get it
reasonably lean, but I still don't have enough adjustment.  The higher power
levels have a pretty good mixture on the default tuning.

Right now I'm running the stock 550cc injectors, but I'm considering
changing the primary injectors to 440cc, to help the low end mixture, and
leave the secondaries at 550cc, so that I still get sufficient fuel flow
with the turbo at higher power settings.

My thinking is that the 440cc injectors would allow me turn the fuel
pressure back up to 38 lbs. and hopefully still be able to tune the lower
end where only the primary injectors are supplying fuel.

Does anyone have experience doing this, hopefully with a turbo, or just have
an opinion ?

Steve Brooks