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Author Topic:   Tool box Spring Rate Calculator
wlmrp
Dirt Roller

Total posts: 5
posted September 18, 2005 01:46 PM  
I was wondering if anyone has compared actual measured spring rates of a given spring against the value calculated by the toolbox coil spring rate calculator. I don't have access to a rate checker so I was using the next best thing.

I'm putting together a 76 chevelle pure stock type car. 3500# min. anytime,no jacks,stock appearing springs, stock suspension parts and mounting location. Plan on using the springs with .675 and .625 dia. wire if they will hold the car up at 3500# and the calculator is reasonably accurate. Replies from multiple viewpoints would be helpful.

I have these springs and got the listed results:
new Hypercoil 7 x 14 300# double pigtail stock appearing. wire dia = .705 x 4 coils. Calculator says 253#
new Hypercoil 7 x 14 250# double pigtail stock appearing. wire dia = .675 x 4 coils. Calculator says 213#
used stock 7 x 15 double pigtail from Olds wagon. wire dia = .625 x 4 coils. Calculator says 156#
used stock 7 x 15 double pigtail from El Camino. wire dia = .575 x 4.5 coils. Calculator says 100#
used stock 7 x 17.5 double pigtail from Chevelle. wire dia = .550 x 5.5 coils. Calculator says 68#

Thanks
Bill


jay116
Dirt Freak

Total posts: 428
posted September 19, 2005 01:42 AM  
Remember the smallest change in spring diameter makes a diff in the results. So if you are measuring through paint it will throw off the results. And stock springs are very weak from the factory so you will have to find what ever works best. Easiest thing to do is buy stock appearing springs.

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Jason Boivin
http://www.rcracing-team.com

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