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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Suspension Discussion and Modification
Shock tuning
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<blockquote data-quote="Raptor_Envy" data-source="post: 1751523" data-attributes="member: 59233"><p>Do you have access to a shock Dyno? If not I have one in my garage. You really need that to get a dialed in damper curve. Aside from shim configurations, it depends on the damper curve (linear, progress, digressive). There are many ways you can achieve what you want, so the area under the curve is what matters.</p><p></p><p>As to tuning theory, offroad you want to spend your time with what the wheel is doing which means more HS compression relative to pavement shaft velocities. Rebound is going to manage sprung mass until it doesn't. What motocross and dirt track guys do is run compression bias in the front and rebound bias in the rear for fast settling and it also allows you to get power down. Too much rear rebound and you pick up the tires and get less power down.</p><p></p><p>Without knowing what exactly you intend to do makes it hard to suggest damping changes. I can offer to Dyno whatever shim stack you want and tell you what gets you what. </p><p></p><p>The rule of thumb is, bleed+preload gives you low speed. Shim stack thickness (by number of shims, or by few thick shims) will give you more damping everywhere. Bypass or free bleed, and shim stack types eg pyramid, crossover, etc can give you unique damping that allow you to affect highspeed. But mainly its free bleed and total stack thickness.</p><p></p><p>Word of warning too big a stack and you start taking droop away which can also get you into trouble. Also I have no idea what the motion ratios are so we need those to be able to give you a meaningful damping target. </p><p></p><p></p><p>Let me know..</p></blockquote><p></p>
[QUOTE="Raptor_Envy, post: 1751523, member: 59233"] Do you have access to a shock Dyno? If not I have one in my garage. You really need that to get a dialed in damper curve. Aside from shim configurations, it depends on the damper curve (linear, progress, digressive). There are many ways you can achieve what you want, so the area under the curve is what matters. As to tuning theory, offroad you want to spend your time with what the wheel is doing which means more HS compression relative to pavement shaft velocities. Rebound is going to manage sprung mass until it doesn't. What motocross and dirt track guys do is run compression bias in the front and rebound bias in the rear for fast settling and it also allows you to get power down. Too much rear rebound and you pick up the tires and get less power down. Without knowing what exactly you intend to do makes it hard to suggest damping changes. I can offer to Dyno whatever shim stack you want and tell you what gets you what. The rule of thumb is, bleed+preload gives you low speed. Shim stack thickness (by number of shims, or by few thick shims) will give you more damping everywhere. Bypass or free bleed, and shim stack types eg pyramid, crossover, etc can give you unique damping that allow you to affect highspeed. But mainly its free bleed and total stack thickness. Word of warning too big a stack and you start taking droop away which can also get you into trouble. Also I have no idea what the motion ratios are so we need those to be able to give you a meaningful damping target. Let me know.. [/QUOTE]
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GEN 2 (2017-2020) Ford F-150 Raptor Forums
Ford Raptor Suspension Discussion and Modification
Shock tuning
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