Quote:

...What is a smoothing factor and whats is the diff between a 4 and 5?
What does negative correction factor mean and how does it affect the run?...




OK, fair enough.

Smoothing has to do with the amplitude of peaks & valleys of the power line on the graph; the lower the smoothing number, the more jagged the run, & the lower the smoothing, all other things equal, the run is likely to show a slightly higher peak power output. The smoothing numbers run from 1 to 5. Most reputable tuners that I know run it at 5.

The correction factor (CF) takes the raw power numbers and corrects the power output achieved on that dyno on that day for reference point temperature, altitude, and pressure data; all other things equal, there is more power potential at sea level; there is more power potential in colder weather; there is more power potential at higher pressure.

Here's an article that explains some of this in a straightforward manner:

Hemrick Dyno Article

Here's another good article that helps explain some of the issues with comparing dyno numbers & how to interpret data:

Dr Dyno Article

The above articles focus on Harleys, however the dyno principles are still the same.

Your run was SAE, which is good. The CF for your run was 0.95.

If the CF of a run is < 1, then the bike made more power than the referenced correction; however, if the CF of the run is > 1, then the bike made less power than the referenced correction.

Stated differently, on that dyno, with that operator, on that day, on run # 2, your bike's actual RWHP output was 53.41 HP (50.74 / .95 = 53.41)

Don't even get me started on the differences among SAE/DIN/STD CF's...