Re: datalogs LEAN AFR
If you get an adjustable regulator for the fuel system from ROB, you can adjust the pressure to tune the F/A system. I have done this and was at 9.0 at one time using the boost signal to feed into the stock regulator, phew that was rich.
I now use a fluidic style computer to adjust the F/A and close the loop with the Zeitronic control signal to bleed off pressure if needed, there are charts from a dyno pull at carlisle in my gallery.
My fluidic regulator gives me one psi output signal for each psi the boost is over my set point, the set point is adjustable so that I have an adjustable offset and add one psi per psi of boost over the set point. For me its like 15 psi or less = no boost signal to the fuel regulator. 16 psi gives one psi to boost the fuel rail pressure by one psi. 19 psi boost signal would give me 3 psi signal to boost the rail pressure by 3 psi, thus I am at about 60 psi at idle and at 19 psi boost the rail pressure goes up to 60 plus 3 or 63 psi.
The fuel that the engine gets; is affected by the on time of the injector pintal, the boost and the fuel pressure. at the limit the boost can push back on the injector to limit the fuel squirt to cause leaning at high boost.
Enjoy, Woody
BTW rich, lower the rail pressure a bit, lean, raise it also, adjustable regulators and filters are old news at Needswings, ask Rob. WW