Valving Logic demonstrated the effect of adding a crossover to a simple tapered shim stack. Adding the crossover makes the damping force softer everywhere, not just at low speed.
Tuning crossovers to produce the single effect of softer low speed damping requires multiple changes to the shim stack:
- Adjust the crossover position
- Adjust the crossover diameter to produce the desired low speed damping
- Adjust crossover gap to produce the desired closure velocity
- Adjust the high speed stack to produce the desired high speed damping
There is no algebraic equation to “design” a crossover. Crossovers are tuned by hacking around on each of the above four parameters to hit the desired ow damping target while maintain the same high speed damping. That is a tedious process on a dyno, but rapid Shim ReStackor calculations make the process easy.
Tuning crossovers to hit a damping target requires multiple simultaneous changes to obtain the single result of softer low speed damping. Multiple simultaneous changes frustrates many tuners committed to the “one thing at a time” approach to tuning.
