I had never seen a dyno tune done in person before - it was pretty cool!
I didn't go there looking for big numbers (otherwise I'd trade the 919 in on a sport bike!)
I wanted smoother, more consistent fueling.
Getting the bike ready
I told him there was a spot starting around 4,500rpm where the power felt 'raw' instead of smooth, and asked if he could check the air/fuel ratio through the entire power range because I had a feeling it had some lean spots. Sure enough, the first run showed that it was rich down low and lean on top.
You can see where the blue line starts getting all wiggly just past 8,000 rpm, and the blue line across the bottom is weaving above and below the red dotted line, instead of staying parallel with it.
I only got a photo of the first pull. He did 6 pulls and made adjustments between each one. It's now a little smoother down low, and quite a bit smoother from 5,000-10,000rpm (the rev limiter kicked in at 10,200rpm).
I was happy, not only is the fueling adjusted properly and the power smoother, but as a bonus it picked up 3 hp in the middle and 1.5 on top, and gained 5 lb/ft of torque in the middle and 3 lb/ft on top.
Peak numbers are 105.16 hp and 66.17lb/ft of torque. Not too impressive compared to modern sport bikes but I'm happy with it!!
When I got there the guy was tuning a BMW S1000RR track bike. Performance-wise it was stock except for an Akropovic exhaust.
Here's his first run
Over 5 pulls and some fiddling on the laptop, he picked up 12hp in the middle and 10 on top, and he gained 8 ft/lbs of torque in the middle and 5 on top.
His peak numbers were 189.9hp and 81.5lb/ft of torque - pretty impressive for a bike that's almost completely stock!!