^^^^It's really a damn trip trying to attach a document to a post on this forum. I've complained about this before. The files sizes are too darn small. I downloaded a Kenne Bell white paper, which I spent 30 mins. trying to make small enough to fit here without luck). So I attached the appropriate section here:
3. DYNO CURVE SMOOTHING -The smoothing function "flattens" or "smooths" the peaks on the curve thereby increasing/reducing the HP reading. Peaks originate from the slight jerking motion of the tires on the dyno rollers, surging or torque converter flashing spikes at the shifts. Disregard these spikes. Note: At Kenne Bell, we use the unsmoothed curves as it has proven valuable in our analysis and data collection. For example: An out of balance tire or a slight ignition misfire could show up as spikes that shouldn't be disregarded by smoothing. Smoothing can vary power readings by approximately 10HP.
Sorry I couldn't attach the whole thing, or at least a page out of it