03-02-2014, 11:23 AM
It doesn't help that most maps are just designed to cover the standard range of rail pressure available on the OEM sensor, so about 1500bar. I'm pretty sure with the likely changes you've made at that point the RP control valve duty cycle map will need re-building so it even delivers what you are asking it to at the kinda IQ's you'll be requesting.
Obviously you can de-calibrate and over-reach stuff, or re-range maps etc etc... but yes it's just becoming a matter of damage-control type mapping rather than exact setting of desired variables.
Like Ruan (I think it was) mentioned, why we are so obsessed with rail pressure is funny really. In practice 1500bar is a HUGE amount and with a good enough fuel pump and bigger injectors the whole opening time/atomisation issues become kinda irrelevant.
But then that is it's own can of worms wrt getting calibrations perfect for idling/cold start etc.
Needless to say, go too far and things just become shades of "bodge grey" rather than the clear black and white approach we enjoy up to about 140bhp
Oh for a software for one plug and three plug ECU's that just had everything re-ranged and rebuilt to 2000bar/100mm3/1500MAF hehe
Like you say though, resolution is probably becoming an issue on some maps so you'd want them to be bigger maps... new can of worms.
Would be nice to get an OEM SDK/compiler for this ECU
Dave
Obviously you can de-calibrate and over-reach stuff, or re-range maps etc etc... but yes it's just becoming a matter of damage-control type mapping rather than exact setting of desired variables.
Like Ruan (I think it was) mentioned, why we are so obsessed with rail pressure is funny really. In practice 1500bar is a HUGE amount and with a good enough fuel pump and bigger injectors the whole opening time/atomisation issues become kinda irrelevant.
But then that is it's own can of worms wrt getting calibrations perfect for idling/cold start etc.
Needless to say, go too far and things just become shades of "bodge grey" rather than the clear black and white approach we enjoy up to about 140bhp
Oh for a software for one plug and three plug ECU's that just had everything re-ranged and rebuilt to 2000bar/100mm3/1500MAF hehe
Like you say though, resolution is probably becoming an issue on some maps so you'd want them to be bigger maps... new can of worms.
Would be nice to get an OEM SDK/compiler for this ECU
Dave