E36 M3 Spring Rates
By Ben Liaw

Updated 3/6/00.

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. 

 

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)