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Online fabr

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Spring selection
« on: April 05, 2009, 08:25:59 PM »
We need a good old in depth discussion of spring selection.I'll admit I'm a bit lost in the voodoo science of it. Dual rate/spring length/rate/crossover collars/whatever.Let's hear some ideas/thoughts/tips!
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Offline Doug Heim

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Re: Spring selection
« Reply #1 on: April 05, 2009, 09:05:52 PM »
I know there is a formula out there where you plug in simple #s from the buggy design and it is usually a good starting point. I lost it and would like to know again. Anyone with any knowledgeable info please share. I am also an Eibach spring dealer.
« Last Edit: April 06, 2009, 05:24:04 AM by Doug Heim »
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Offline Tydra

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Re: Spring selection
« Reply #2 on: April 05, 2009, 09:22:06 PM »
check FOA shocks website, they have a dual rate spring calculator.  http://f-o-a.com/calculator.html
« Last Edit: April 05, 2009, 09:24:37 PM by Tydra »
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Online fabr

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Re: Spring selection
« Reply #3 on: April 05, 2009, 09:44:34 PM »
Quote from: Doug Heim on April 05, 2009, 09:05:52 PM
I know there is a formula out there where you plug in simple #s from the buggy design and it is usually a good starting point. I lost it and would like to know again. Anyone with any knowledgeable info please share. I am also an Ebiach spring dealer.
So does Swayaway. Those things are just so so tho.
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the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Online fabr

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Re: Spring selection
« Reply #4 on: April 05, 2009, 09:46:35 PM »
I'm kind of looking personal preferences and such.
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the English language... and we have room for but one sole loyalty and that is a
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Offline Engineer

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Re: Spring selection
« Reply #5 on: April 05, 2009, 10:50:57 PM »
Quote from: Tydra on April 05, 2009, 09:22:06 PM
check FOA shocks website, they have a dual rate spring calculator.  http://f-o-a.com/calculator.html

Rate selector works well!  Thanks.

Now if the Eibach site didn't suck I could use the info.  It's one of those sites that is all fancy looking, but short of actual information.  I feel like I walked into Autozone and asked for a header gasket for a big block chevy, and the clerk just keeps asking what make and model.

http://eibach.com     Good luck!
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Offline BDKW1

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Re: Spring selection
« Reply #6 on: April 06, 2009, 12:45:12 AM »
Personal preference? Corner weight the car, figure out the unsprung weight, figure out ride height, buy single rate springs for zero pre-load drooped while getting the desired ride height.
 
If you need a longer spring and must run duals, stick with the same rate springs.
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yossi

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Re: Spring selection
« Reply #7 on: April 06, 2009, 12:50:42 AM »
hi
there is another site for spring calculators
check that one
http://www.proshocks.com/calcs/index.htm

yossi
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Online fabr

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Re: Spring selection
« Reply #8 on: April 06, 2009, 06:01:43 AM »
Quote from: BDKW1 on April 06, 2009, 12:45:12 AM
Personal preference? Corner weight the car, figure out the unsprung weight, figure out ride height, buy single rate springs for zero pre-load drooped while getting the desired ride height.
 
If you need a longer spring and must run duals, stick with the same rate springs.
Why would you not want dual rates?
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Re: Spring selection
« Reply #9 on: April 06, 2009, 06:50:38 AM »
Quote from: Masterfabr on April 06, 2009, 06:01:43 AM
Why would you not want dual rates?

because it takes more math to figure it out...
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Offline BDKW1

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Re: Spring selection
« Reply #10 on: April 06, 2009, 10:16:09 AM »
Becuase they do evil things unless you have the set-up proporly.
 
Say you have a 300/300 combo in the rear. That gives you a 150 initial rate and 300 after you hit the secondary spring stop. No biggy on compression, but when it starts to rebound......
 
If you have your rebound set up for 150 spring rate, your buggy will want to kick. If you have it set up for 300 rate, it will pack up. If you have bypasses, you can get around this by having the secondary spring stop let off at the same time the rebound tube kicks in. Swayaway has a slider calculator to help set this up on their web site.
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Online fabr

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Re: Spring selection
« Reply #11 on: April 06, 2009, 12:08:14 PM »
Finally ,I get an answer after asking everywhere I could think of that clicks in my head now.  I see what you're saying. BUt ,what if a person goes with a very light tender spring that's only really effective early in the stroke?
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but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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Offline BDKW1

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Re: Spring selection
« Reply #12 on: April 06, 2009, 12:44:08 PM »
Tender springs are used a lot to keep the main from rattling. Not an issue.
 
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Offline fastcorvairs

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Re: Spring selection
« Reply #13 on: April 06, 2009, 01:12:39 PM »
Quote from: BDKW1 on April 06, 2009, 12:44:08 PM
Tender springs are used a lot to keep the main from rattling. Not an issue.

And I have always been told that you need the tender springs to absorb all the small ruts and take the hammer out of the steering wheel.  Then let the mains take care of the large whoops and the jumping. 
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Online fabr

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Re: Spring selection
« Reply #14 on: April 06, 2009, 02:03:45 PM »
But that puts us back to the dual rate issues with shock valving.
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"There can be no divided allegiance here.  Any man who says he is an American,
but something else also, isn't an American at all.  We have room for but one
flag, the American flag... We have room for but one language here, and that is
the English language... and we have room for but one sole loyalty and that is a
loyalty to the American people."
Theodore Roosevelt 1907

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 " You have all the right in the world to believe any damn thing you'd like, but you don't have the right to demand that I agree with your fantasy"
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