Originally Posted by shiv@vishnu
Raising UT will bump up boost at all engine speeds. Going up a stage will only raise boost above ~5000rpm. So it really depends on what you are looking for. Usually, we like to keep a self-imposed torque limit in place which means limiting boost to ~13psi in the low end. Or else we would see the 400+lbft peak torque situation that isn't really necessary.
As I posted in the past, unless it's triggering a tuner code; why limit torque down low? Isn't that the purpose of the 1st and 2nd gear torque limits...so that the end-user has control over this.