Alex in your real sim scenario you talk about applying max power (is it max CONT ?) from a low speed situation at altitude. I talked about starting from the same situation but with applying very minimal increase of thust (let's say from 1.20 to 1.21 EPR) and seeing the aircraft accelerate far too long. It's not only the duration of acceleration which is the issue it is also the increase of acceleration. It seems that the rate of acceleration goes higher which is the part I find unrealistic. For any excess thrust applied in level flight there is an acceleration in speed that must be dampened. i.e. the rate of this acceleration is diminishing) due to squared function of air resistance. I have no idea of what the final accel will be on any scenario this must be shown on aircraft perf. manual or engine data.