Jim
It is all mapped into the chip
ok please ring karl n tell him what i just wrote n he'll tell you the same as me
it CANT be mapped into the chip as the chip/ECU will never know what the boost is after you hit 1bar...
so if you run say 1.5bar then you simply set the 1bar part of the map to fuel enuf for 1.5bar v. easy
but if suddenly you hit 2.0bar then the ECU wont know this and will supply the same fuel it requires at 1.5bar and guess what...
...it'll melt
unless you have a magic map sensor that actually reads upto 2 bar of boost (like... erm... a 3bar

) or your ECU has inbuilt AI