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<blockquote data-quote="WannaB-class5" data-source="post: 821023" data-attributes="member: 2461">Wow, it might take pages and pages to clear all that up.&nbsp; I will start with a few things I know.&nbsp; A 600/600 dual rate system will not give you a 600# rate.&nbsp; It will give you 300 lbs.&nbsp; Maybe an explanation of what the spring rate means will help...I am no expert but I will do my best.A spring with a 600 inch pound rate will collapse 1&quot; if you set 600 pounds on it.&nbsp; Simple right?&nbsp; (These springs are for all useful purposes have a linear spring rate) So if you set 1200 pounds on it, it will compress 2&quot;.&nbsp; If you set 300 pounds on it...yep it compresses .5&quot;.&nbsp; OKAY now if you have two 600lb coils, one on top of the other (a dual rate coil-over!) and you set 600 pounds on it what will happen?&nbsp; Well the first spring will compress 1&quot;, and guess what, so will the second spring!&nbsp; So how far did they compress?&nbsp; Two inches total. So if 600 pounds caused the springs to compress 2&quot;, then what is the spring rate of this set up?&nbsp; 300 pounds!&nbsp; So the formula you found is correct.&nbsp; Spring rate 1 times spring rate 2 divided by spring rate 1 PLUS spring rate 2.&nbsp; Or in our example 600x600/600+600 which is 360000/1200 which we know is 300!</blockquote>

[QUOTE="WannaB-class5, post: 821023, member: 2461"] Wow, it might take pages and pages to clear all that up. I will start with a few things I know. A 600/600 dual rate system will not give you a 600# rate. It will give you 300 lbs. Maybe an explanation of what the spring rate means will help...I am no expert but I will do my best. A spring with a 600 inch pound rate will collapse 1" if you set 600 pounds on it. Simple right? (These springs are for all useful purposes have a linear spring rate) So if you set 1200 pounds on it, it will compress 2". If you set 300 pounds on it...yep it compresses .5". OKAY now if you have two 600lb coils, one on top of the other (a dual rate coil-over!) and you set 600 pounds on it what will happen? Well the first spring will compress 1", and guess what, so will the second spring! So how far did they compress? Two inches total. So if 600 pounds caused the springs to compress 2", then what is the spring rate of this set up? 300 pounds! So the formula you found is correct. Spring rate 1 times spring rate 2 divided by spring rate 1 PLUS spring rate 2. Or in our example 600x600/600+600 which is 360000/1200 which we know is 300! [/QUOTE]

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