I think that for all of us is interesting to know all maps we have to change to tune our car... :D

For diesel engines:

SVBL
Desired Boost
Boost Limiter Maps

: enhance boost to get more mass air flow which is needed to inject and burn more fuel without produceing smoke

SOI/Duration

: change start/ end of injection to gain responsiveness and maybe more power -> most of the time leads to higher egt´s
Durationmaps are only needed to calculate EOI at specific rpm and are not changed (only naps change durationmaps- fastest way of tuning but cheating the ecu with wrong injection duration timings... bad on engine faults and smokelimiters dont work as calculated...)

Torque Maps

: enhance to allow injection of more fuel and to avoid blow up your gearbox

Smoke Limiter Maps

: calculate new gained mass air flow from increased boost and at the right calulated values to have good afr


vtg maps

: most of the time not needed for standard tuning but if used right could be used to reduce turbolacks and spikes...


rail/pd maps /limiter /limitermaps

: on some engines modifing rail/pd maps can be used to increase performance
-but tuning this maps can only be done "right" by
analysing the exhaust gas because changeing railpressure or pd is going to change the start/end of combustion and the caracteristics of the combustion...


It depends on the tuner if he is limiting the max iq by the torque limiter or by the smoke maps with calculated afr


So what you need is all knowledge about diesel engines and how the engine works including all formulas to set the maps in correlation and calculate good values for the engine. Testing software to do testlogs which have to be done and used to correct/improove your tune on the specific engine. Best: knowledge about gearbox and the cars weakpoints to not damage any hardware...

Most tuned files i saw just increase the maps by percentage without calculations and proper relations of afr, eoi, egt...