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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Suspension Discussion and Modification
Geiser Progressive Spring Review
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<blockquote data-quote="stewwalker" data-source="post: 1283525" data-attributes="member: 12781"><p>After some more thought, research and beer, I think I have this progressive spring thing figured out and can answer some of my own questions. </p><p></p><p>How are Geiser springs stiffer?</p><p>When at ride height and under the weight of the truck, Geiser springs will be into a “stiff zone” equal to the weight of the truck. I assume that Geiser spring rate at ride height is stiffer than stock to improve bottoming resistance. </p><p></p><p>How are they more compliant over small bumps?</p><p>When you hit a bump with stock springs, the amount of force input to move the shock X inches up, is also the same amount of output force for the shock to return to its normal position. As I stated before, think of a linear graph for both compression and rebound. </p><p>When you hit a bump with Geiser springs, the amount of force needed to move X inches will not be linear. Think, of a progressive graph. So if you take a jump and all 4 are off the ground, instead of landing on a 550 lb spring then a 1100 spring then a 2200 spring, you would be landing on a softer spring, then a little firmer spring, then a firmer, so on and so forth.</p><p></p><p>To me the benefits of progressive shocks will be most noticeable if you are working the shocks and utilizing the full stroke because you would be getting a softer spring rate when they are fully extended, and a stiffer spring rate when they are fully compressed. </p><p></p><p></p><p>This might be obvious to some, but I’ve finally been able to wrap my head around what to expect out of these springs. Waiting to hear a good review, but I think I’m on board. </p><p></p><p>I am not an engineer, I am not an expert, I am probably wrong.</p></blockquote><p></p>
[QUOTE="stewwalker, post: 1283525, member: 12781"] After some more thought, research and beer, I think I have this progressive spring thing figured out and can answer some of my own questions. How are Geiser springs stiffer? When at ride height and under the weight of the truck, Geiser springs will be into a “stiff zone” equal to the weight of the truck. I assume that Geiser spring rate at ride height is stiffer than stock to improve bottoming resistance. How are they more compliant over small bumps? When you hit a bump with stock springs, the amount of force input to move the shock X inches up, is also the same amount of output force for the shock to return to its normal position. As I stated before, think of a linear graph for both compression and rebound. When you hit a bump with Geiser springs, the amount of force needed to move X inches will not be linear. Think, of a progressive graph. So if you take a jump and all 4 are off the ground, instead of landing on a 550 lb spring then a 1100 spring then a 2200 spring, you would be landing on a softer spring, then a little firmer spring, then a firmer, so on and so forth. To me the benefits of progressive shocks will be most noticeable if you are working the shocks and utilizing the full stroke because you would be getting a softer spring rate when they are fully extended, and a stiffer spring rate when they are fully compressed. This might be obvious to some, but I’ve finally been able to wrap my head around what to expect out of these springs. Waiting to hear a good review, but I think I’m on board. I am not an engineer, I am not an expert, I am probably wrong. [/QUOTE]
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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Suspension Discussion and Modification
Geiser Progressive Spring Review
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