Anyone else got examples of your engine dyno result vs. actual track result not matching up? I'm not necessarily talking about peak HP #s on "happy" dynos not showing up as expected MPH. This is along the lines of something that tested positively on the dyno not translating into any difference at the track, or just the opposite where the dyno showed no improvement, but the track did.

Example from my own tests: Engine dyno comparison between my "tried and true" Holley 850 and my then-new Holley "950 HP" 80496-1. Dyno showed basically NO difference in peak torque or HP between the two carbs. However, the track showed a solid .2 ET and 2 MPH improvement with the "950 HP" during a same-day swap of the carbs. Why? Because the dyno didn't factor in the shift recovery characteristics of the smaller-venturi "950 HP" enabling the car to pull back up the RPM quicker after each shift.