School me on BMW/Porsche brake upgrade options.

[m3f_WRXEATR_c6f1d80be6]

Yikes! That's about the time my currents began their problems...

[m3f_TRACK-CZAR]

you do realize you have increased brake torque with 4 pistons in the wilwood kit, to increase brake torque applied to the brake pads right?



Not necessarily....if the area of the 4 pistons is greater than the area of the single ZCP caliper, then yes...brake force torque might be greater. The larger diameter of a ZCP rotor might trump this.

[m3f_TRACK-CZAR]

Area is what is important, and mathematically a 70mm piston has an area of 3848 mm^2.



A 35mm piston has an area of 962. (cut the diameter in half, the area is cut to 1/4)



That said, two pistons with a combined total area of 3848 will apply the same force as one piston with the same area.



The reason we want more pistons, especially with larger pad areas, is the forces are spread out and tend to wear much more evenly (e.g. no pad taper).



The reason we want more rotor than is needed to lock up the brakes is during hard driving, we need somewhere for the heat to go so we don't overheat the pads, fluid, rotors etc. Large rotors with more mass are a better heat sink. Having unswept pad area, especially to the inside, helps keep heat away from wheel bearings. As an engineer I am sure you can understand what happens to the grease when it overheats, or the seals, which then allow the grease a path out and dirt a path in....



Bottom line is no one wants to add unsprung rotating weight, especially when it is expensive. If you only drive on the street and follow the laws for the most part, stock brakes are fine. Stock brakes with better pads/fluid is fine for autocross, and beginner HPDE. But as you get faster and move up to R compounds on a road course, the limitations of even good stock brakes like the M3 has quickly make life hell.





EDIT: For the most part, OEM ABS systems will fix and bias issues created by adding front brake.



This is the best post I have read in three days.....

[m3f_OahuMPower_17503f01cd]

Jesus... stop comparing our e36 stuff with your e46 shiet.... we don't care... god, this thread was dead too

[m3f_Magic M3_88afc92f23]

Somebody stop him Please!!!! :greenchai

[m3f_WRXEATR_c6f1d80be6]

Somebody stop him Please!!!! :greenchai


:laughhard::laughhard::laughhard::laughhard: :laughhard: :laughhard:


That's some funny sh!t right there

[m3f_Magic M3_88afc92f23]

:laughhard::laughhard::laughhard::laughhard: :laughhard: :laughhard:



That's some funny sh!t right there



Thanks Spencer, I'm glad I could bring some humor into this! :rofl3:

[m3f_stubadub_562e7c1e0e]

If your still looking for 850/840 calipers there's a couple on car-part.com



used of course. $100 or less each.

[m3f_WRXEATR_c6f1d80be6]

If your still looking for 850/840 calipers there's a couple on car-part.com



used of course. $100 or less each.



You must be looking at the wrong ones. I'm on a notification system with them. I buy them as soon as they show up, and they're not there.

[m3f_stubadub_562e7c1e0e]

You must be looking at the wrong ones. I'm on a notification system with them. I buy them as soon as they show up, and they're not there.



what year range will work?