08 ISX Boost issue

[boots769]

Thanks Marajin ,, I usually test run anything ive tuned and have found that the overlays for 550/1850 running in most chassis in Australia will run to just over 40psi when pushed hard and will cruise about 20-25 psi , usually get good mileage (2-2.4kpl) ,,just have not seen turbo overspeed derate even in 600/2050 cals that if you dont bring boost right down will blow to 45psi ,, will recal tgc min opening to 45 max and set turbo derate threshhold from 105k to 108 or 110k and test run the sucker ..all seems to go well until pulling hard at or around max power ,, I usually expect to see max boost around max torque , just seems a little strange to be overspeeding at higher rpm