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In order to convert kg/mm to lb/in do the following. Multiply the kg/mm amount by 56. So if you kg/mm spring rate is 6 kg/mm Front and 5 kg/mm Rear your lbs/in would be 336 lb/in Front and 280 lb/in Rear. Pretty Simple.
Below is a archive of Spring Rates for various stock and aftermarket springs for the s13 and s14. Enjoy, Please post any additions you may have to this list. Thanks!
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s13 Spring Rates
Stock '92 (from FSM)
Front & Rear: 102 lb/in
Front & Rear: 110 lb/in w/ HICAS
Eibach ProKit
Front: 114-200 lb/in | -1.8"
Rear: 114-148 lb/in | 1.6"
Eibach Sportlines
Front: 137-230 lb/in | 2.2"
Rear: 128-200 lb/in | 2.1"
Suspension Techniques: 1.3" drop
Front: 206 lb/in | 1.3"
Rear: 155 lb/in | 1.3"
5Zigen R-Rate
Front = 2.4-5.2 kg/mm | 134-291 lb/in | 1.3"
Rear = 1.9-5.0 kg/mm | 106-280 lb/in | 1.1"
Tein HA
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in
Tein HE
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in
Tein RA
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein RE
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein RS
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein FLEX
Front = 5 kg/mm | 280 lb/in
Rear = 4 kg/mm | 224 lb/in
Tein S.Tech
Front = 3.2 kg/mm | 179 lb/in
Rear = 2.9 kg/mm | 162 lb/in
Zeal Function B-6
Sreet Spec:
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in
Circuit Spec:
Front = 8 kg/mm | 448 lb/in
Rear = 7 kg/mm | 392 lb/in
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s14 Spring Rates
kg/mm DR21
Front = 4.8-3.0 kg/mm | 269-168 lb/in
Rear = 4.0-2.8 kg/mm | 224-157 lb/in
kg/mm DR Racing
Front = 6.6-3.2 kg/mm | 370-179 lb/in
Rear = 5.2-2.4 kg/mm | 291-134 lb/in
RSR Hard Springs
Front = 5.0 kg/mm | 280 lb/in
Rear = 4.2 kg/mm | 235 lb/in
TANABE SuperH
Front = 3.0 kg/mm | 168 lb/in | -28mm
Rear = 4.0 kg/mm | 224 lb/in | -9mm
TRUST Sport Springs
Front = 2.6 kg/mm | 146 lb/in | -25mm
Rear = 2.6 kg/mm | 146 lb/in | -25mm
HKS Super Sports
Front = 4.14 kg/mm | 232 lb/in
Rear = 3.46 kg/mm | 194 lb/in
Tein HA kg/mm
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in
Tein HE
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in
Tein RA
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein RE
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein RS
Front = 10 kg/mm | 559 lb/in
Rear = 8 kg/mm | 448 lb/in
Tein FLEX
Front = 6 kg/mm | 336 lb/in
Rear = 5 kg/mm | 280 lb/in
Tein S.Tech
Front = 4.8 kg/mm | 269 lb/in
Rear = 4.4 kg/mm | 246 lb/in
Zeal Function B-6
Sreet Spec:
Front = 6 kg/mm | 336 lb/in
Rear = 4 kg/mm | 224 lb/in
Circuit Spec:
Front = 8 kg/mm | 448 lb/in
Rear = 6 kg/mm | 336 lb/in
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