Dyno numbers don't mean much unless you have the times to back it up at track.
If you have the right monitoring hardware, knock sensors etc, you can normally feel how a car is responding to various tune changes. I'm more talking about WOT and hi airload areas here, our engines are knock limited so in theory will hit a knock limit not a power limit.
Obviously depends on fuel and rpm too.
If you think you can dial a car in perfectly on a constant ramp rate and think this is going to show all real world conditions then you're dreaming.