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Spring Rates:
OEM Springs: ............................ 126 lb/in Front, 129 lb/in Rear
H&R Race (1.4"F, 1.3"R):.............. 310 lb/in Front, 250 lb/in Rear
H&R Sport (1.4"F, 1.3"R):............. 205 lb/in Front, 195 lb/in Rear
Eibach Pro Kit (1.3"F, 1.1"R):........ 149 lb/in Front, 91-159 lb/in Rear
Progress Group (1.8"):................. 200 lb/in Front, 170 lb/in Rear
Progress Group (1.3"):................. 156 lb/in Front, 150 lb/in Rear
Sprint (2.0"):............................. 200 lb/in Front, 140 lb/in Rear
Sprint Extreme(2.5"): .................. 200 lb/in Front, 140 lb/in Rear
Suspension Techniques (1.4"):...... 157 lb/in Front, 109-155 lb/in Rear
Struts:
KYB GR-2 front: 30% stiffer than stock
KYB GR-2 rear: same as stock
ST front:*
ST rear:*
*No one knows any real specifics on the ST struts as far as dampening goes. But the general consensus is that they are stiffer than KYB GR-2s.
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S Series Aftermarket Spring Rates
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Created by:
SixthSphere.com
- Published: 10-04-2010, 10:45 PM
- 2 comments
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Spring Rates: OEM Springs: ............................ 126 lb/in Front, 129 lb/in Rear H&R Race (1.4"F, 1.3"R):.............. 310 lb/in Front, 250 lb/in Rear H&R Sport (1.4"F, 1.3"R):............. 205 lb/in Front, 195 lb/in Rear Eibach Pro Kit (1.3"F, 1.1"R):........ 149 lb/in Front, 91-159 lb/in Rear Progress Group (1.8"):................. 200 lb/in Front, 170 lb/in Rear Progress Group (1.3"):................. 156 lb/in Front, 150 lb/in Rear Sprint (2.0"):............................. 200 ...
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Channel: How To: S-Series
10-01-2010, 11:50 AM -
Some of the stock springs have slightly higher rates than what is generally accepted, and there are a few different ones to choose from.
All have a tangential end and a pigtail end -- I mention this because 'tangential' end springs can indeed be cut, resulting in both lowering and a (counterintuitive) increase in spring rate... which might be useful.
I ordered some of the Rockwell '681s on closeout, and the tangential end sure looks like a 'square' end to me (the last 1/2 turn on the helix on that end is bent back a little -- hard to describe, but it's not uniform with the neighboring turns) Bottom line: I'm not sure these can be cut.
BTW, regarding cutting springs: https://www.eatondetroitspring.com/c...-calculations/ is a good starting place. There are many spring calculators online.
The following data is from http://www.moog-suspension-parts.com...il_springs.asp with my added comments. The Moog part numbers mostly cross to Rockwell, substitute RV- as a prefix, e.g. RV662. Other aftermarket manufacturers of 'stock' replacement parts seem to be out of the game at this point, but the part numbers are similar.
Some of these are variable rate, and I have no idea what the actual numbers are versus deflection. I have a friend (ME prof) at a local university... will see if I can get some time on his Instron machines for testing.
These data are confirmed with cross references from Rock Auto, classiccarsprings.com, and other sites. Hopefully I typed it all in right. The first two are fronts, the rest are rears.