Ok pplz this is for the tuners out there that tune EMU. I have a SARD fuel pressure regulator installed with all necessary supporting mods to run1.5 bar boost. My question is that which is better when tuning the EMU adding or subtracting fuel from the fuel maps? The reason why i am asking this is because i read that when u subtract fuel with the EMU it also messes with the ignition timing and when i was tuning and i checked the logs i see my ignition drops to like in the negative (-) for the timing. The SARD RRFPR is set to like 42 psi on idle. What are your taughts on this guyz? Any and all input will be greatly appreciated.
Your question isn't very clear.
But if your talking about lowering the fuel pressure to increase the resolution of the ECU then is is acceptable to an extent. You don't want to lower the pressure too much, as some injectors will struggle to atomise the fuel. If your injectors are 500cc or less, theres no reason to go below 3 bar base pressure. Above this you'll struggle with the Emanage blue, as it doesn't have enough adjustment, and the big injectors won't atomise fuel at lower pressures. The car will run ok, just probably in a 12-13 AFR.
Anyway, it sounds like you have got some negative values in the ignition map causing the negatives on the logs.
As for the fueling, you need to remove fuel from the Airflow table, and add it using the main fuel table, (main fuel doesn't allow minus figures).
As for the timing, simply adjust using the ignition timing table.