Menu
Forums
New posts
Search forums
Calendar
Monthly
Weekly
Agenda
Archive
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Help Support Hardline Crawlers :
Forums
Rock Crawling Forums
Tech & Fab
Coilover Tech
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="mac5005" data-source="post: 542235" data-attributes="member: 4650"><p>Chris and Wayne, I have a question, and I hope to clarify it in this thread, so others can use you guys' answers to help them in the future.</p><p></p><p>After reading Wayne's Spring thread on pirate several times, and somewhat understanding it,</p><p></p><p>I have done some research and measuring on the rear of my YJ and have found, I have the wrong springs. My current springs are too stiff and too short. </p><p></p><p>Currently I am set up with 7.125" up travel on 14" coilovers. I have - 0.125" preload to achieve my desired ride height, with a 12" 170 lb upper spring over a 14" 250 lb lower spring. </p><p></p><p>The springs are compressed 6.875". </p><p></p><p> (Spring compression + preload) * initial rate = Load supported at shock</p><p></p><p>[6.875 + (-.125)] * 101.19 = 683 lbs at the shock.</p><p></p><p>To double check, I measured each spring indivually. The 170 lb upper is compressed 4.75", and the 250 lb lower compressed 3". Using above formula:</p><p></p><p>(4.75 - .125) * 170 = 786 lbs at shock</p><p>(3 - .125) * 250 = 718 lbs at shock</p><p></p><p>adding 2" desired preload to my current travel position, to attempt to find the new correct initial spring rate I find 3 possible new initial rates, and the average of the 3:</p><p></p><p>786 / 8.875 = 88.5 lbs / in new initial rate</p><p>718 / 8.875 = 80.9 lbs / in new initial rate</p><p>683 / 8.875 = 76.9 lbs / in new initial rate</p><p></p><p>and the average of 82.1 new initial rate. </p><p></p><p>Why the 100 lb difference in calculated weight at the shock? Is this due to spring fatigue? The Coilovers have been ran without crossover rings since 2009, as instructed by vendor. Which weight at the shock should I use to calculate the new desired rate to order my new springs? </p><p></p><p>Overall .125" preload will cover the 10 lb difference between the spread. But what about choosing the right springs for a good step up when the slider hits the newly installed crossover ring, and rate increases to the lower spring only? You have mentioned to have the springs within 100lbs of each other if possible. </p><p></p><p>Is it also a good idea, if possible, to have the initial rate, and the lower spring rate within 100lbs?</p><p> </p><p>In my scenario, I am choosing between commonly available PAC 2.5" springs:</p><p></p><p>76.9 = 125 / 200</p><p>77.8 = 140 / 175</p><p>78.8 = 130 / 200</p><p>80.4 = 125 / 225</p><p>80.8 = 150 / 175</p><p>82.4 = 140 / 200</p><p>82.4 = 130 / 225</p><p>84.9 = 165 / 175</p><p>85.7 = 150 / 200</p><p>86.3 = 140 / 225</p><p>87.5 = 175 / 175</p><p></p><p>How should I choose which springs to order? <img src="/styles/default/xenforo/smilies2/dunno.gif" class="smilie" loading="lazy" alt=":dunno:" title="Dunno :dunno:" data-shortname=":dunno:" /></p><p></p><p> I want to ditch the useless triple rate hardware, run a 14" upper spring, 16" lower spring, and start with the Xover ring 2" above the slider at ride height. This is a semi-hardcore wanna be buggy trail jeep. </p><p></p><p> I do have the 12" 170s which are too short, the 14" 250s which are too heavy, and a set of 14" 150s off of KarateJosh's buggy.</p></blockquote><p></p>
[QUOTE="mac5005, post: 542235, member: 4650"] Chris and Wayne, I have a question, and I hope to clarify it in this thread, so others can use you guys' answers to help them in the future. After reading Wayne's Spring thread on pirate several times, and somewhat understanding it, I have done some research and measuring on the rear of my YJ and have found, I have the wrong springs. My current springs are too stiff and too short. Currently I am set up with 7.125" up travel on 14" coilovers. I have - 0.125" preload to achieve my desired ride height, with a 12" 170 lb upper spring over a 14" 250 lb lower spring. The springs are compressed 6.875". (Spring compression + preload) * initial rate = Load supported at shock [6.875 + (-.125)] * 101.19 = 683 lbs at the shock. To double check, I measured each spring indivually. The 170 lb upper is compressed 4.75", and the 250 lb lower compressed 3". Using above formula: (4.75 - .125) * 170 = 786 lbs at shock (3 - .125) * 250 = 718 lbs at shock adding 2" desired preload to my current travel position, to attempt to find the new correct initial spring rate I find 3 possible new initial rates, and the average of the 3: 786 / 8.875 = 88.5 lbs / in new initial rate 718 / 8.875 = 80.9 lbs / in new initial rate 683 / 8.875 = 76.9 lbs / in new initial rate and the average of 82.1 new initial rate. Why the 100 lb difference in calculated weight at the shock? Is this due to spring fatigue? The Coilovers have been ran without crossover rings since 2009, as instructed by vendor. Which weight at the shock should I use to calculate the new desired rate to order my new springs? Overall .125" preload will cover the 10 lb difference between the spread. But what about choosing the right springs for a good step up when the slider hits the newly installed crossover ring, and rate increases to the lower spring only? You have mentioned to have the springs within 100lbs of each other if possible. Is it also a good idea, if possible, to have the initial rate, and the lower spring rate within 100lbs? In my scenario, I am choosing between commonly available PAC 2.5" springs: 76.9 = 125 / 200 77.8 = 140 / 175 78.8 = 130 / 200 80.4 = 125 / 225 80.8 = 150 / 175 82.4 = 140 / 200 82.4 = 130 / 225 84.9 = 165 / 175 85.7 = 150 / 200 86.3 = 140 / 225 87.5 = 175 / 175 How should I choose which springs to order? :dunno: I want to ditch the useless triple rate hardware, run a 14" upper spring, 16" lower spring, and start with the Xover ring 2" above the slider at ride height. This is a semi-hardcore wanna be buggy trail jeep. I do have the 12" 170s which are too short, the 14" 250s which are too heavy, and a set of 14" 150s off of KarateJosh's buggy. [/QUOTE]
Insert quotes…
Verification
Post reply
Latest posts
Pickett State Park/Blackhouse Mountian 1-23-2016
Latest: ridered3
Friday at 3:12 PM
Trail Rides & Competitions
Daves Offroad Supply
Latest: Daves Offroad Supply
Wednesday at 10:52 AM
Vendors
B
For Sale
Artec Back-bone truss for 14 bolt
Latest: Bebop
Tuesday at 7:19 PM
Off Road 4x4 Parts For Sale
P
YouTube of the day
Latest: paradisepwoffrd
Monday at 8:21 AM
General Discussion
Cash LeCroy Illness
Latest: ridered3
May 26, 2024
General Discussion
Forums
Rock Crawling Forums
Tech & Fab
Coilover Tech
Top