Quote:
Originally Posted by DRLane
Street get 380x36 front and 380x32 rear, while Radi-Cal gets the 372, 355? Huh.
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Edit: redid the Essex/AP cals for the e9x M 355 mm rear rotor OD
I was curious to see which kits had the highest torque outputs. So I calculated the brake bias and torque output of the Essex/AP Racing competition (accidentally did f8x, not e9x M) and road sport brake kits.
Brake bias:
Comp f8x kit 0.61 front biased
Road kit 0.62 front biased
Comp e9x 0.68 front biased
Front torque (only one side of the caliper)
Comp f8x kit 7434 lbf-in
Road kit 7229 lbf-in
Comp kit e92 7434 lbf-in
-Comp kits have 2.8% more applied torque
Rear torque (only one side of the caliper)
Comp kit 4671 lbf-in
Road kit 4367 lbf-in
Comp e9x kit 4049 lbf-in
-Comp f8x kit has 7.0% more applied torque than the Road Kit but the Comp e9x M kit has 7% fewer applied torque than the Road kit
So the CP9668/CP9449 Comp f8x kit has higher torque outputs with the 372/365 OD rotors than the CP9561/CP9541 Road kit with 380/380 OD rotors. Brake bias is negligible at 1% difference between the two kits. Larger rotor diameter, especially with a large pad radial depth, doesn’t always produce the highest torque output.
So the CP9668/CP9449 Comp e9x M kit has higher front and lower rear torque outputs with the 372/355 OD rotors than the CP9561/CP9541 Road kit with 380/380 OD rotors. Brake bias is 6% more forward for the Comp e9x M kit than the Road kit. This is a noticeable difference and some may prefer it. I prefer a more rear biased setup but you can adjust front-rear brake bias by running a higher or lower friction level rear pad relative to the friction level of the front pad. At certain tracks I run the same rear compound or a rear pad with a higher friction level than the front. VIR is a track where a higher CoF rear pad can be used to brake later on the uphill section of the back straight. I also experience no rear ABS kicking in while braking for turn 1 on the long front straight and I’m able to brake later for turn 1.