Injector Flow at Rated Pressure

[RyanG]

Given only a single value is able to be specified for injector flow (per fuel type), I assume there is a background correction for differing fuel pressure from rated pressure? How well does this work across completely different setups? Is it able to maintain constant AFR during mild fuel surge? Or minimise required VE changes if base fuel pressure is increased, but flow at rated pressure left the same?

I don't currently have an adjustable pressure reg, but need to get one shortly as I'm up around 90% DC on 1000cc and don't really want to upgrade so looking to just up the base pressure for head room.

I was tuning a friends car (different ecu) and it had a 3D user editable table for injector flow. Setting up inj flow against both differential pressure and fuel composition % seemed neat. I could see it helping maintain consistent AFR across fuel comp with a single VE table if required on lower end ecu's. Perhaps it's unnecessary if Link's background calculation "just works"? At least a second value is able to be set for the multi fuel. I believe other platforms have a single value then a correction factor.

[Vaughan]

8 hours ago, RyanG said:

Given only a single value is able to be specified for injector flow (per fuel type), I assume there is a background correction for differing fuel pressure from rated pressure? How well does this work across completely different setups? Is it able to maintain constant AFR during mild fuel surge? Or minimise required VE changes if base fuel pressure is increased, but flow at rated pressure left the same?

Yes there is a standard flow/differential pressure calculation that is used to constantly adjust actual flow rate based on fuel pressure. Note that deadtime values can change based on differential fuel pressure.