ISX CM2350 VGT & Brake Table

[Unilevers]

ooh someone getting serious about their cal....your in the deep end now!

just put the vgt position tables for engine braking back to stock. you really want the boost to peak at about 32-34 psi under full load jake. any higher and guys like it but its extremely hard on the engine and dropped valves are common.

what is controlling the VGT is MCF tables for different operating modes. The engine looks at sensor variables and load demand and decides how much Mass Charge Flow (physical amount of air) the engine needs and ramps the vgt to provide that aslong as its between its set operating limits. This varies greatly per mode the engine is in and sensor inputs aswell. if it wants 50 lbs/min and its only getting 30 its going to start ramping the hell of the vgt to max to speed the turbo up and push more air through until it hits its set operating limits. the engines are also set to have factory variable limits which mean it varies per Chi and alpha mode. this is why you see it trying to continually ramp up.

is its a common rail or a dual cam? its varies greatly and i have found stock cals for common rails are rich as hell in the idle regions and need to be compensated for - just food for thought.