Solid fluid dynamic models implemented within the framework of conservation of mass and momentum in ReStackor provides an engineering analysis tool capable of quantifying the effect of each component in the shock on overall system performance and suspension operation over the entire range of suspension speeds. Tabular outputs of ReStackor pro show the fluid dynamic forces applied to the stack face as a function of damper rod velocity. I did find an older Slackmeyer stack somewhere and used it as a data point when developing my stacks. Mid-Stroke Harshness In a motorcycle fork it is desirable to have near zero spring force at the top of the stroke. All of the above examples show stack deflection as a function of force applied to the stack. Practical Results Clicker Map: Due to the stress concentration at the clamp most shock absorbers use a tapered stack to smooth the bend radius and avoid over stressing the shims.
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Shim restackor program. Anyone used it? - dbw - Members Forums
Tune the resstackor stack in terms of clicker settings and forces you can actually feel when riding. This sharp bend creates a stress concentration and can fatigue or permanently bend the shims destroying the integrity of the stack.
Changing the stack taper manipulates the high speed damping rates.
My initial motivation to look into all of this was the forks on my XC-W. The thickness of a crossover shim effects both the point where the crossover gap closes and the stiffness of the stack. But there is an important difference. Modifying the mid-valve float influences damping in the low speed range and the velocity where the suspension transitions to mid-speed.
ReStackor Sample Applications Finally computer software to tune a shim stack. You can exchange stacks through web forums and weight scale the stack to your spring rate and weight so that you can test and feel the suspension response of the rider that originally developed the stack.
Haven't bothered to buy the program yet as I figured I should learn the hrad way and get my hands dirty, but the software is very good for comparing stacks to see which is stiffer here softer there etc. ReStackor gives you the capability to easily evaluate complex stack structures, fine tune features of the stack and evaluate the effect of those changes over the entire range of stack deflection. I have Redline Medium in my Mid Speed Mid-speed damping is controlled by the combined force of the base and mid-valve.
For tuning you can replace a shim or series of shims with a thinner or thicker shim. Easily interpreted plots quantify the performance of each component in the shock.
The thickness of a crossover shim effects both the point where the crossover gap closes and the stiffness of the stack For the above example a crossover shim thickness of 0.
Go softer and the suspension baby-buggies. How do you get the valve body information into the program? The capability of ReStackor to evaluate the effect of those changes over the entire range of stack deflections helps to avoid unexpected surprizes before you install the stack in your bike.
Fork midvalve question- and other DIY suspension tuning
Bladders pressurize the fluid reservoir of a shock and backpressure the fluid circuits to maintain pressures above cavitation limits. If you could reason with religious people there would be no religious people.
Relating stack stiffness and damping force to clicker settings gives you the capability to implement single click changes to the suspension and modify only the low speed or only high speed damping to confidently create the damping force curve you want.
Determines suspension link ratio, chassis and wheel bottoming velocities, and stroke averaged suspension response zeta coefficients ;ro tuning of suspension systems.
The above example demonstrates some of the confusion surrounding the design of crossover shims. The capability to confidently implement multiple stack changes allows you to tune the shim stack far beyond levels previously possible.
MX suspension setups use stiff mid-valve shim stacks to control bottoming on large hits. Find all posts by nexusfish. Whether you are a seasoned professional or a first time tuner ReStackor gives you the information and insight you need to understand each feature of the stack, how those features effect damping rates and the suspension velocities where those features affect the feel and operation of the suspension.
ReStackor Mid-Valve Tunning
I still didn't have a handle on how much those shims flexed under various loads. ReStackor pro provides this capability.
When the pressure falls to the vapor pressure of the hydraulic fluid a vapor vacuum bubble forms. Your ReStackor code key will restacior emailed to you. Finally got to put a few miles on the new setup this weekend. Pivot shims can be used to control the stiffness of high speed and low speed damping rates.
A bit out of Canberra.
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