I decided to open a little discussion on it. I think every ecu i have used has its own setup on how to do it. Some work better than others. But quite simply the megasquirt's is the hardest to setup. It is not intuitive at all. In fact it is down right strange.
What is it
The accel (acceleration) pump is used to add a bit of extra fuel the second the throttle is depressed, the harder, or rather faster you press it, the more fuel u will need to add, this is to stop the engine from missing from a sudden lean condition and the air rushes into the engine. Some will need more some will need less.
Tables you need
- Delta TPS = The initial value of fuel from the rate of tps or map change.
- Accel vs RPM = A scaler for the accel pump size based on rpm, you always need more at low engine speeds
- Coolant temp = A correction to the accel amount based on coolant temp
- Trigger = The delta rate that the accel pump engages. this will stop miss triggers
- Max size = The max amount of change that the accel pump will change the PW by.
- Decay time = How fast the pump will decay. this should be done as a percentage decrease based on the last value.