 Rear Coil Spring Question |
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| LCOX |
 May 28 2019, 02:20 PM
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#1
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Member  Group: Members Posts: 93 Joined: 19-December 09 From: Pinnacle Member No.: 11,148 Region Association: None  |
Anyone know how to determine the "spring rate" on rear suspension coil springs.
-The ones that I just took off my car appear to be the stock ones and I've heard are either 90 or 100lb springs. -The aftermarket ones I have here feel stiffer to push down. They are painted yellow and I don't see any markings on them. They are also several inches shorter than the stock ones that came off the car. -Any way of know what pound springs these yellow ones are? |
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| Mark Henry |
May 28 2019, 02:51 PM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
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| roblav1 |
May 28 2019, 03:45 PM
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#3
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Senior Member Group: Members Posts: 528 Joined: 18-September 12 From: KY Member No.: 14,943 Region Association: MidAtlantic Region |
I've used a 400 lb digital postal scale in a drill press. Weigh the spring first!
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| dr914@autoatlanta.com |
May 28 2019, 03:52 PM
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#4
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914 Guru Group: Members Posts: 7,868 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
the old yellow ones were made by pacesetter and were rated at 120 lbs
QUOTE(LCOX @ May 28 2019, 01:20 PM)  Anyone know how to determine the "spring rate" on rear suspension coil springs. -The ones that I just took off my car appear to be the stock ones and I've heard are either 90 or 100lb springs. -The aftermarket ones I have here feel stiffer to push down. They are painted yellow and I don't see any markings on them. They are also several inches shorter than the stock ones that came off the car. -Any way of know what pound springs these yellow ones are? |
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| Dave_Darling |
May 28 2019, 09:00 PM
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#5
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914 Idiot Group: Members Posts: 14,990 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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The original stock springs were in the 50-65 lb/in range.
You can measure the spring rate; it is pounds of force divided by inches of compression. Put weight on it, measure how much shorter it gets. --DD |
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| tomeric914 |
May 29 2019, 12:01 PM
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#6
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One Lap of America in a 914! Group: Members Posts: 1,259 Joined: 25-May 08 From: Syracuse, NY Member No.: 9,101 Region Association: North East States
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QUOTE(Dave_Darling @ May 28 2019, 10:00 PM) You can measure the spring rate; it is pounds of force divided by inches of compression. Put weight on it, measure how much shorter it gets. (IMG:style_emoticons/default/agree.gif) Also take a look at the link in my signature on how to put together your own spring combo that is fully adjustable. |
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