Springs

According to Eibach, the spring rates of the standard springs are:

1 N/mm = 5.710146 lb/in Front 290 lb/inch Rear 150 lb/inch

See here[1]

---

A set of new genuine Lotus front and rear S2 springs were obtained and sent to Turton Springs (Sheffield) for testing -- results below.
The front spring (B100C0086F) is applicable to all Non-USA SE and S2. It is NOT applicable to the Normally Aspirated or USA cars.
The rear spring (B100D0071F) is applicable to all Non-USA, SE and S2 and Normally Aspirated. It is NOT applicable to the USA cars.

FRONT  B100C0086F Yellow/Yellow/Green
Diameter of Wire d (inches)	0.531”
Inside Coil Diameter(inches)	3.298”
Outside Coil Diameter(Inches)	4.360”
Number of Coils: Total 		8.5
Free Length (inches): 		10.690”
Actual Load Rate Measured on Test (Pounds per inch): 300 Lbs / IN
Loads at Testing:
10.000” = 186 Lbs
9.000” = 485 Lbs
8.000” = 785 Lbs
7.000” = 1087 Lbs
6.000” = 1390 Lbs
Remarks
  BOTH ENDS CLOSED & GROUND FLAT & SQUARE 
  TIPS JUST TOUCHING   APPROX THICHNESS 50% 
  EPC BLACK WITH CC = 2 X YELLOW 1 X GREEN  STRIPES 

REAR  B100D0071F Green/Yellow/White
Diameter of Wire d (inches)	0.406”	
Inside Coil Diameter (inches)	3.338”	
Outside Coil Diameter(Inches)	4.150”	
Number of Coils	Total		6.6	
Free Length (inches)		9.490”	
Load Rate (Pounds per inch) Actual Load Rate Measured on Test (Pounds per inch)	144 Lbs / IN
Loads at Testing 
9.000” = 65 Lbs
8.000” = 210 Lbs
7.000” = 354 Lbs
6.000” = 495 Lbs
5.000” = 642 Lbs
Remarks
		
  BOTH ENDS CLOSED & GROUND FLAT & SQUARE 
  TIPS JUST TOUCHING   APPROX THICHNESS 40% 
  EPC BLACK WITH  CC = 1x GREEN 1x YELLOW 1x WHITE 
  STRIPES