When buying a Storia the customer receives a sheet with a checklist of stuff done with the shock, QC stuff and all. Last week I had the idea of asking the marvellous EXT comp if they would be willing to share the dyno plot listed on said sheet of my custom built Storia shock I bought with my Titan last year. Turns out they were. Now I got the plot but am not really understanding all of it.
It's a Velocity-Force diagram picturing runs with two different settings. The blue one with 14 out of 14 clicks of HSC, 12 out of 12 clicks of LSC and 7 out of 8 clicks of LSR, the brown one with 10 clicks of HSC, 0 clicks of LSC and 0 clicks of LSR. This means one run nearly fully open and one with a bit of HSC and fully closed LSC and LSR.
Comp is in the top left quadrant, rebound in the bottom right. Here's my interpretation. The different LSC settings are visible at the low speeds from 0 to about 25 mm/s resulting in different gradients. The change to HSC can be seen in the different force values at which the first kink appears and the damping force curve digresses meaning the shims start to lift. What I don't understand is the second kink appearing at around 250 mm/s and the different gradient in that mid speed range between 25 and 250 mm/s. At higher speeds both lines are parallel again. I always thought that the preload of the base valve shim stack only affects the threshold force or needed pressure to get the shims to lift. When I come to think about it, there may be a crossover stack or something. But then again it wouldn't explain the different gradient. Or would it?
I asked EXT about it but I guess the language barriers netted in a not very satisfying answer.
So, anybody got some ideas? Calling out on all the usual suspects but not exclusively @Kanye West @englertracing @tacubaya @buckoW @Udi maybe even @Steve M rises from the ashes.
It's a Velocity-Force diagram picturing runs with two different settings. The blue one with 14 out of 14 clicks of HSC, 12 out of 12 clicks of LSC and 7 out of 8 clicks of LSR, the brown one with 10 clicks of HSC, 0 clicks of LSC and 0 clicks of LSR. This means one run nearly fully open and one with a bit of HSC and fully closed LSC and LSR.
Comp is in the top left quadrant, rebound in the bottom right. Here's my interpretation. The different LSC settings are visible at the low speeds from 0 to about 25 mm/s resulting in different gradients. The change to HSC can be seen in the different force values at which the first kink appears and the damping force curve digresses meaning the shims start to lift. What I don't understand is the second kink appearing at around 250 mm/s and the different gradient in that mid speed range between 25 and 250 mm/s. At higher speeds both lines are parallel again. I always thought that the preload of the base valve shim stack only affects the threshold force or needed pressure to get the shims to lift. When I come to think about it, there may be a crossover stack or something. But then again it wouldn't explain the different gradient. Or would it?
I asked EXT about it but I guess the language barriers netted in a not very satisfying answer.
So, anybody got some ideas? Calling out on all the usual suspects but not exclusively @Kanye West @englertracing @tacubaya @buckoW @Udi maybe even @Steve M rises from the ashes.
