JFryer Posted July 2, 2004 Share Posted July 2, 2004 Well Its friday, working on the Z, painting my new 15x8 Centerline wheels (Black centers polished lips) Looking at my brakes thinking upgrade (Have vented Maxima with toyota Calipers Hawk HP+ pads) Would like to go to some day go to a outlaw 2800 caliper. When I decided to get out the old Brake handbook by Fred Puhn and work some numbers. What I did was workout the Kinetic energy of two Z's of different weights at the same speed. Then I figured out the temperature rise in the brake system for both cars stopping from that speed or slowing down to 40 MPH. !!WARNING!! There are lots of assumtions in these calculations. Some of them are Total S30 Brake weight of 30 lbs (Rotors/Drums) Perfect brake bias Equal temp rise among all componants (I.E. Rotors and drums) No cooling during the stop No Aero drag No rolling resistance. And others If you want more info read the book. Well Ok here are the Numbers. 2800 lb Z MPH Kinetic Energy @40 149832.776 ft-lbs @60 337123.746 ft-lbs @80 599331.104 ft-lbs @100 936454.859 ft-lbs @120 1348494.983 ft-lbs 2250 lb Z MPH Kinetic Energy @40 120401.337 ft-lbs @60 270903.01 ft-lbs @80 481605.351 ft-lbs @100 752508.361 ft-lbs @120 1083612.04 ft-lbs Temperature Rise (One Stop) 2800 lb Z 60 - 0 144F 80 - 0 257F 100 - 0 401F 120 - 0 578F 60 - 40 80F 64F 80 - 40 193F 100 - 40 377F 120 - 40 514F 2250 lb Z 60 - 0 116F 80 - 0 206F 100 - 0 322F 120 - 0 464F 60 - 40 64F 80 - 40 155F 100 - 40 271F 120 - 40 413F I hope this helps sombody. If nothing else it was a good way to spend a rainy afternoon. Also sorry about the format I tried to do columns but it didn't format properly when submitted Quote Link to comment Share on other sites More sharing options...
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