Lets explore the reason(s) why a dyno is far more accurate than a drag strip (or any other track).
1. No driver. If a driver can’t do a burnout the same 3 times in a row, he probably won’t make the same run 3 times in a row.
2. Weather. The dyno room is a controlled environment. Even 5 minutes of cloud cover can change the track. And that changes ET/MPH
3. The track. Track prep, where the driver stages (see reason 1), did the driver stage straight 3 times in a row.
That’s 3 simple reasons the dyno is far more accurate than a track. 99% of the cars out there have never been on a scale so the weight is at best a guess.
Here is a bonus…
4. The car. Bad tires. Crappy shocks. Wrong converter. A car that flexes like gumby. Wrong IC.
So just those 4 things right there make the track a crap shoot at best. Add two or more together and you have a real poop salad.
The dyno gets blamed for things that aren’t its problem.