I think it depends on what kind of Dyno you are on. The one I was on I would get to fifth gear and rev to 1500rpms and hold it. Then he would tell me to floor it and it would hold at 1500rpm but it would build boost. After I built enough boost I would tell him and he would turn it loose and I would keep it floored until I hit the rmp's that I was comfortable with, which was 3500.