Spring Rate Comparison
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E36 M3 Spring Rates The following data is NOT taken from any book or brochure, but measured with a Longacre spring testing machine. All measurements are in inches and pounds.
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| Front Spring | US M3 ('95) |
Euro M3 #31 33 2 227 422 |
US M3 LTW |
| Wire Diameter | 0.480 | 0.490 | 0.480 |
| Free Length | 13.6875 | 12.50 | 12.75 |
| Diameter | 6.0 | 6.0 | 6.0 |
| Number of Coils | 5 | 5 | 5 |
| Lbs. @ 1" | 87 | 97 | |
| Lbs. @ 2" (lbs. for 1") | 188 (94) | 215 (108) | |
| Lbs. @ 3" (lbs. for 1") | 291 (97) | 333 (111) | |
| Lbs. @ 4" (lbs. for 1") | 392 (98) | 446 (111) | |
| Rear Spring | US M3 ('95) |
Euro M3 #33 53 9 064 881 |
US M3 LTW |
| Wire Diameter | 0.6320 | 0.629 | 0.629 |
| Free Length | 9.50 | 9.125 | 9.125 |
| Diameter | 5.75 | 5.75 | 5.75 |
| Number of Coils | 7 | 7 | 7 |
| Lbs. @ 1" | 210 | 225 | |
| Lbs. @ 2" (lbs. for 1") | 450 (225) | 475 (238) | |
| Lbs. @ 3" (lbs. for 1") | 720 (240) | 740 (247) | |
