The track guys at Willow Springs (ESP from Tucson) set up the suspension on my 919.
They maxed out the shock preload and were still looking for more, same with the forks. Then they adjusted the rebound and recommended raising the forks 3mm.
I told them about the Race Tech kit that I hadn't installed yet and an Ohlins shock when I can justify the cost.
The bike felt more hooked up and predictable, I'm sure the Power 2CTs helped a little.
I just need to get used to the handling, it feels so different.
I was going faster through all the turns but felt like the opposite.
Not confusing at all -- the closer you get to the optimum the better it works and the less dramatic in a corner. Less drama makes for smoother, especially if it was set up too soft to begin with, and that feels slower regardless of how fast you're going. It certainly sounds like you need stiffer springs -- while bumping the preload to get the sag right is all well and good, it doesn't change the rate of the spring involved, which at optimum should have no preload on it at all other than what is required to short out the dead coils with the suspension topped out. If possible find an original spring from an '02 or '03, which are generally regarded as too stiff, and give it a try -- mine is at the lowest preload and still pretty stiff, but the faster I go the better it feels. You'd probably hate it on the street, but on the track ...
Anyway, hold off on the Ohlins shock until you try it with the proper rate springs -- you may be surprised.
If it has already been done, it is safe to assume it is possible to do it.
On the other hand, if it has not been done never assume it is impossible to do it.
------- Rob --------
I don't believe theres any aftermarket springs availible for the 919. An old trick to increase spring rate is to cut off a coil, flatten out the top of the spring so it sits flush, then install a spacer to take up the slack. Measure everything befor you cut to make sure you don't end up coil binding.
Agreed suspension is what most guys that are fast spend the most money on. Of course good rubber helps. Is it really worth it to spend alot on a 919 suspension. You have a well set-up Tuono why not use it for track days. I should know and it has turned a wheel in anger on the track. One of my best days ever at the track was on it.
Good luck on straights I was getting spanked at Summit Main. I was letting off early for turn one. Still I would get a good run out of the last turn only to have a 600 or 750 pass me. They have more steam up top. I would reel them back in the turns.
You should a Hawk GT at Willow Springs. I got passed like crazy down the front straight. I was urging that thing on half way down. Okay 115 come 120.