This should be easy to implement, the data is already there.

Years & years ago I was the test mule for a new digital speedo/tach/computer product for Harleys. It all fit in the case of a Softail speedo, & with an LCD display told you everything from rpm to charging voltage. Even had an alarm built in. Anyway, it had one great feature I've never seen since... a "pass through" timer.

The timer could be set at any starting MPH, and any finishing MPH. You do a full throttle run starting at below the first point & continue until after the second point, & it would tell you the time it took between the 2. Unlike 0-60 times, 1/4 mile times etc. there was no shifting involved, no user variable... just a full throttle run. Without those added variables you could make a change in a/f ratio, timing, etc. and see instantly if it made a difference for the better or worse. Make a run with a map, record the time, make a run with another map, record the time, etc.

Not a dyno run but pretty accurate results.

Does someone already have this? Maybe a cell phone app?