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What makes the valving number? And which number means comp. and recoil?
Okay, so when valving a shock you use a stack of one #. So all #30, #40, #90.... I've heard of "flutter stacking" which involves putting a small shim over the the large bottom shim. This is to soften the shock over light bumps but it keeps the rest of the valving for harder bumps. I read it as a way to get progressive valving out of coil overs before bypass shocks. Pretty cool
Taco, coils on coilovers aren't progressive, as you said but leafs are somewhat progressive. Correct?
The All Pro springs that Marlin used to sell were 220lb rate and about 240 or so in the back. With a leaf spring if you go softer you induce additional axle wrap and then you need a torque arm or axle wrap arm to control it. 220 on a leaf is soft but on a coil 220 (for a toyota mini and spring on the axle) is super stiff. Im at about 75lbs in the front of mine and about 80 in the rear.
I don't want to sound rude, But you're saying a progressive spring dosen't quite work well with the progressive valving of a flutter stack? and that a leaf spring with much slower rebound characteristics then a coil spring works well with lots of rebound dampening? is this for rock crawling only?
Ok so maybe what I said wasen't so clear. A proressive spring like a leaf that is soft in the beginning and stiff in the end doesnt work well with a flutter, which is also soft in the beinging and stiff at the end. Because typically when the spring gets stiffer you dont want to also get stiffer on compression valving. That makes for a harsh ride. Stiffer spring requirer softer compression stacks and vise a versa.Leaf springs typically have higher rebound rates than a coils not lower. If the typical leaf spring is sprung at 220lbs per inch and at least my typicall coil is 94lbs which is higher. Softer compression rates of the spring require stiffer compression valving. Stiffer rebound rates require stiffer rebound valving. In the end a spring with high compression rates also has high rebound rates. Ramping up in spring rate "IS NOT" beneficial for high speed racing. You need to keep the spring the same and progessively stiffen the shocks compression rates to handle better.
This is why the web site posted above, www.shimrestackor.com, is so important. You need to familiarize yourself with multi-stage valving to optimize things like inexpensive leaf springs and their somewhat harsh ride at speed. Running a particular stack, usually all the same shim diameter, for low speed (cornering and braking) forces, then a separated 2nd stack, this is your pyramid stack, for high speed (bump impacts) is going to blow your mind. Don't limit your dampers to just what Fox or whatever the brand recommends, the possibilities are endless, and I'm only talking about basic emulsion or IFP style dampers here.