Stu,

Can i ask, What affect the fuel pressure has on a map???

I was just thinking that the Ecu has no sense or control over it, so therefore what effect would its base setting have on the rest of the map?

i.e. If 3.5 was tested and shown to provide best fueling, what affect would the fuel pressure have on the map if say adjusted to 3.0bar or 4.0bar???

Im assuming that the higher pressure would provide a greater flow rate and the lower a less flow rate, so does that mean it could potentially lean or rich the entire map???

Hope thats not off topic