Originally Posted by JesseT
Keep in mind that the fuel-ecu is unaware of the boost level, it only senses air-flow. Also, the current only tunes the amount of fuel via the control pressure. So, what the air-flow disc hits hte bottom, then engine start to run lean. Well, the old KE-jetronic could be tweked forever to get it better and better for big hp, but the real problem is to get it to fuel well in all conditions and not to completely destroy the fuel economy.
However, if someone want's to hack the fuel-ecu, I think it's better done outside the ecu itself. One could do a box which has a resistor equal to the ~30 Ohm of the EMPA. Then sense the voltage across it, modify with RPM or BOOST or even with a 2D map, and then reproduce the voltage across the real EMPA. Just something I had in mind before I ditched the KE completely in favour of the Megasquirt management.
interesting stuff
but what exactly is the EMPA ?
I should learn more about capacitors and transistors and such stuff, and then to sense the different out- and inputs pins of the module with my multimeter to get to know how it works and maybe I can come up with a plan
cheers