Outside that damping range you are better off going to a softer or stiffer spring. That gives the suspension a consistent “feel” through the Baseline tuning sets peak compression damping forces Suspension riding “high in the stroke” over small trail trash bumps.īy the ratio of rebound/compression damping. Tuning target is a rebound/compression damping ratio of 0.8:1 below To prevent packing suspensions need low speed compression damping to be slighter Go softer and the suspension baby-buggies.Įither pack or jack. Go stiffer and the slow rebound response causes the That fact sets rebound damping for the baseline setup at zeta Spring-mass-damper theory defines reboundĭamping zeta values of 0.7 to give the fastest possible suspension response withĭamping that is still stiff enough to suppress suspension resonance ReStackor suspension responseĬalculations define the ballpark of where that “good spot” is usingīasic suspension tuning rules-of-thumb to define damping targets for compressionĠ.8:1 below suspension speed of 3 to 6 in/sec ResponseĬalculations are an add-on to ReStackor pro and run on the Response tab of Stroke, damping force and rebound response zeta coefficients. Response outputs show the suspension velocities over the Inputs of weight and spring rate using the shocks damping force computed by Suspension bottoming velocities are computed from The suspension link ratio from measurements of wheel and shock position. ReStackor suspension response calculations compute ReStackor takes the guess work out of shim stack tuning so you can focus on the art of suspension Visually compared across the entire range of suspension velocities. The graphical environment and spreadsheet interface allow calculations to be easily run and results Referencing forces you can actually feel when you ride. Two clicks stiffer at low speed or three clicks softer at high speed ReStackor modeling of clicker settings lets you use your real world ridingĮxperience to tune the shim stack in terms Makes the calculations equally applicable toĪutomotive racing shocks, trophy trucks or the setup of mountain bikeįundamentals of structure mechanics and fluid dynamics give ReStackor the capability to computeĭamping force as a function of shim stack structure, valve port geometry and clicker settings. ReStackor calculations on the application of basic physics Stack stiffness, flow area, fluid dynamic flow losses and the resulting ReStackor uses multi-physics simulations to model that process combining the fundamentals of ![]() Larger flow area and controlled progression of the shocks damping force. Flow losses are controlled by the stiffness of the shim stack on the shock absorber valve.Īt low speed the shim stack is barely cracked open resulting in high jet velocities, highĪs shaft speeds increase fluid pressure forces the stack to open further producing That gives you the capability to fine tune your suspension far beyondĭamping forces produced by a shock are the result of controlled fluid dynamic flow losses through the To clicker settings giving you the capability toĬonfidently tune complex shim stack configurations to achieve specific The stiffness of shim stacks and relate changes in the shim stack structure Of the hardest aspects of suspension tuning, a skill professional tuners spend yearsĬapability to guess the combination of shim stack changes needed to achieve Suspensions can't be setup once-and-for-all, you can see that trackside at any national level race with teamsįrantically searching for a useable setup. After developing some confidence in the setup your riding skillsĮvolve and that generic setup needs re-tuning. Shim ReStackor, Finally software to tune a shim stackĬan purchase a basic suspension setup from any shop.
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