I'll try to explain the most important map in the ECU ........not always map .......is impossible , but the most important.
no matter what driver in ECM Titanium or other software call this map ,
first , language
Break Point = BP , is the axes X and Y and the Z is the value on the map
Intake Manifold Prex = IMP
Injected Quantity = IQ
Driver Wish =DW
Injection Time = IT
ok , the first map you can find it's the map for your gas pedal and this map it's torque request during acceleration or DW
example on a 808 file
BP is rpm/ voltage -position Z is Nm
the next map is torque requested during standard condition
BP is the same
next map is the FCV function during acceleration
BP is rpm/ mm3 IQ and Z is mg of air
next map is the value for the EGR Histeresy , I think is maf value , there is another metod to delete the EGR , but is another story
this map is the first fuel limiter
BP rpm/ pressure , Z is mm3/100 , this pressure is read by the map on the air box
next map , another fuel limiter
BP rpm / IMP , Z is mm3
this map limit fuel during shifting and I think during lockup
next map is the quantity adjustment , fuel air for best afr
BP rpm/ IMP , Z is mg of fuel , for converting the value in mm3 this is the formula mg/1,13= mm3
1,13 is a factor conversion
this map work in conjunction with the IQ / torque map
next map
is the conversion by the DW in IQ
BP rpm / Nm , Z is the IQ in mm3
next map is the torque limiter for every gear
BP is rpm , Z Nm
the next map is the phase , there are six map that manage the start of injection
the value must be converted in degrees , aproximately , 43 point is one degree , but always watch in graphic mode to understanding well the map
BP rpm/IQ , Z = degrees
next 12 map is the time of the injector opening
BP Rail Prex/ IQ , Z= microsecond
next map is the vgt vane , 3 map
BP rpm/IQ Z= % of the actuator I think
normally many tuners decrease this map if the engine have many mile's due to the usury in the vane that can cause overboost condition
this is the turbo map
BP rpm/IQ Z= BAR/10
in this immage you can see the turbo map , after that there is a one BIT at 2300 , this is the turbo limiter and after this limiter anoter limiter that have
BP Volt/BAR Z=BAR , less atmospheric prex always
this limiter work with IAT
next map is the IMP adjustment
next map is the IMP limiter and work on the EGR like a blow off
BP rpm ,Z= BAR
Rail prex limiter
BP rpm /BAR /10 , Z=BAR/10
next map is fuel rail prex
BP rpm/IQ ,Z=BAR/10
now there is two bit that limit the rail pressure , if you do not touch it the rail do not surpass the 1600 BAR
one bit have 16000 and the other 15997 ,
there is other fuel limiter in the management and if you do not touch it you have a maximum of 100 mm3 , now in short words the management work like this , you ask fuel with DW , the ECU translate te Nm in mm3 from the IQ map , then see the IMP and adjust it , than see the rail prex needed with the IQ requested on a particular rpm , then go in the IT and see how many microsecond the injector must stay open , see the phase and adeguate the turbo .
remember if you increase the rail prex , you shorting the IT opening and do not increase the fuel if you do not fool the ECU
hope this help , BTW this can help to do a nice tune if you know what you do
have a nice day
ps : mm3 and mg must be converted ,example 12500mg /100 = 125 mg etcc