I thought I would bring this great info over to the SR20DEForum since there is no info like this in the 240SX section here and Asad from FA did such a great job explaining this over there so he gets all the credit for this: Here is a link to see Asad's Thread on this:
Enjoy:
http://forums.freshalloy.com/ubbthre...fpart=all&vc=1
Different brake setup bias on a 240SX:
Stock 240sx non-ABS front brakes (CL22VB):
- Single piston sliding caliper
- 54.0mm piston diameter
- 252mm diameter rotor
- 45mm wide pad ('width' is the radial dimension of the pad, following the terminology in the FSM)
- effective rotor diameter: 252-45 = 207
- effective piston area: 54^2 x 2 (<-sliding caliper) = 5832
- brake torque = 1207224
Stock 240sx rear brakes (CL9H):
- Single piston sliding caliper
- 34mm piston diameter
- 258mm diameter rotor
- 40mm wide pad
- effective rotor diameter: 218
- effective piston area: 34^2 x 2 = 2312
- brake torque = 504016
Front brake bias = 1207224 / (1207224 + 504016) =
70.5%
Rear brake bias =
29.5%
--------------------------------------------------------------------------------------------------
300ZX front brakes (OPF25VA) with Z33 rotors (OBP27VA):
- Four piston fixed caliper
- 40.45 piston diaeter
- 324mm diameter rotor
- 50mm wide pad
- effective rotor diameter: 324-50 = 274
- effective piston area: 40.45^2 x 4 (fixed caliper) = 6545
- brake torque = 1793330
300ZX rear brakes (OPZ11V):
- Two piston fixed caliper
- 38.1mm diameter piston
- 297mm diameter rotor
- 36.5mm wide pad
- effective rotor diameter: 297-36.5 = 260.5mm
- effective piston area: 38.1^2 x 2 = 2903
- brake torque = 756231.5
front brake bias = 1793330 / (1793330 + 756231.5) =
70.3%
rear brake bias =
29.7%
--------------------------------------------------------------------------------------------------
Q45 front brakes (CL26VF):
- Two piston sliding caliper
- 42.8 piston diameter
- 280mm diameter rotor
- 56mm wide pad
- effective rotor diameter: 280-56 = 224
- effective piston area: 42.8^2 x 2 (sliding caliper) = 7327.36
- brake torque = 1641328.64
Q45 rear brakes (AD11B):
- Single piston sliding caliper
- 38.2mm diameter piston
- 292mm diameter rotor
- 33.9mm wide pad
- effective rotor diameter: 292-33.9 = 258.1mm
- effective piston area: 38.2^2 x 2 = 2918.48
- brake torque = 753259.688
front brake bias = 1641328.64 / (1641328.64 + 753259.688) =
68.5%
rear brake bias =
31.5%
--------------------------------------------------------------------------------------------------
300ZX front brakes (OPF25VA):
- Four piston fixed caliper
- 40.45 piston diameter
- 280mm diameter rotor
- 50mm wide pad
- effective rotor diameter: 280-50 = 230
- effective piston area: 40.45^2 x 4 (fixed caliper) = 6545
- brake torque = 1505350
300ZX rear brakes (OPZ11V):
- Two piston fixed caliper
- 38.1mm diameter piston
- 297mm diameter rotor
- 36.5mm wide pad
- effective rotor diameter: 297-36.5 = 260.5mm
- effective piston area: 38.1^2 x 2 = 2903
- brake torque = 756231.5
front brake bias = 1505350 / (1505350 + 756231.5) =
66.5%
rear brake bias =
33.5%
------------------------------------------------------------------------------------------------
JDM 180SX front brakes (UNKNOWN):
- Single piston sliding caliper
- 57.2mm piston diameter
- 280mm diameter rotor
- 45.3mm wide pad ('width' is the radial dimension of the pad, following the terminology in the FSM)
- effective rotor diameter: 280-45.3 = 234.7
- effective piston area: 57.2^2 x 2 (<-sliding caliper) = 6543.68
- brake torque = 1535801.696
