Announcement

Collapse
No announcement yet.

Brake Rotor / Caliper information

Collapse
This is a sticky topic.
X
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Brake Rotor / Caliper information

    R32 GTST
    Master Cylinder diam (mm) - 25.4 area 506.71mm^2
    Front Caliper Piston(diam x qty) - 40.4 ×4 = 5127.58mm^2
    Front rotors (diam x thk) - 280×30
    Rear Caliper Piston(diam x qty) - 38.18×2 = 2289.78mm^2 ratio FR = 2.239
    Mounting Hole Diameter: Approx 4.5 inches (confirmation to come soon)
    Rear Rotors (diam x thk) - 297×18
    total 7417.36 brake to master ratio 14.63


    R33 GTST
    Master Cylinder diam (mm) - 23.8 444.88mm^2
    Front Caliper Piston(diam x qty) - 40.4 ×4 = 5127.58mm^2
    Front rotors (diam x thk) - 296×30
    Rear Caliper Piston(diam x qty) - 38.18×2 = 2289.78mm^2 ratio FR = 2.239
    Rear Rotors (diam x thk) - 297×18
    Total area 7417.36mm^2 brake to master ratio 16.67

    R32 GTR (Non V-Spec,)
    Master Cylinder diam (mm) - 25.4
    Front Caliper Piston(diam x qty) - 40.4 ×4
    Front rotors (diam x thk) - 296×32
    Rear Caliper Piston(diam x qty) - 38.18×2
    Rear Rotors (diam x thk) - 297×18

    R32 GTR V-Spec / R33 / 34 GTR
    with Brembos
    Master Cylinder diam (mm) - 26.9 568.32mm^2
    Front Caliper Piston(diam x qty) - (44+3Cool×2 ... leading pistons smaller then trailing 5309.29mm^2
    Front rotors (diam x thk) - 324×30
    Rear Caliper Piston(diam x qty) - 40×2 2513.27mm^2 ratio FR = 2.1125
    Rear Rotors (diam x thk) - 300×22
    total 7822.56 brake to master ratio 13.76

    This is the ratio of master piston movement to overall brake pad movement
    R32/GTR calliper ratio 15.43
    R33/GTR calliper ratio 17.58


    So there isn’t much difference between the Brembos and the std Nissan R32/33 GTST calipers and R32 GTR callipers


    Oh...and an old favourite that seems to be a good practical test of what the theory suggests....

    Car & Driver did a test a few years ago ...Test Car was a WRX (US Spec which only uses two piston sliding caliper, not as good as Nissan 4 spot or later Model WRX 4 pots)

    So tested kits were, std car, std car with upgraded pads and fluid, Brembo F50 Kit, Brembo Lotus Kit (Similar to as fitted to GTRs, 44/38mm pistons), Stoptech it and Prodrive Kit (Alcon)

    Stopping Distances 70mph - 0 , 3 Stop
    Brembo F50;_____________ 185 / 183 (Average / Best)
    Brembo Lotus; ______________ 200 / 196
    Prodrive; __________________ 198 / 194
    StopTech;__________________ 187 / 186
    Stock; ____________________ 205 / 196
    Stck with pads and fluid; ____187 / 184

    The above figures are all in feet, one stop difference between pad and fluid upgrade to crappy sliding caliper brake setup and massive Brembos is 1 ft...lol 30cms And over 3 stops the average is 2 ft...lol 60cms

    So you can see the one stop max of the upgraded pads and fluid is damn good when you consider the $$$ to % difference.


    Stopping Distances 100mph - 0 , 25 Stop
    Brembo F50; _____________ 299 / 288 (Average / Best)
    Brembo Lotus; ______________305 / 294
    Prodrive; __________________ 308 / 295
    StopTech;__________________ 297 / 290
    Stock;_____________________ 340/317
    Stck with pads and fluid;_____316/299

    Not the world of difference you would be led to believe by the "you need 6pot caliper 343mm rotor crowd."


    Specs of the kits:
    Rotor Weight (pounds) Size in inches (diam / thk)
    Brembo F50;.................15.8......................... .13.1 / 1.3
    Brembo Lotus;..............12.9.......................... 12.9 / 1.1
    Prodrive;......................16.5............... ............13.0 / 1.1
    StopTech;...................13.9.................. ........12.9 / 1.1
    Stock;.................. ......14.2..........................11.6 / 0.9


    Caliper Weight , Piston Size, (mm)
    Brembo F50;..........8.6 pounds...........40 / 44, Leading / Trailing
    Brembo Lotus;.......6.8.......................36 / 40
    Prodrive;...............9.1..................... 34.9 / 41.3
    StopTech;.............9.3.....................36 / 40
    Stock;.................10.8.................. .43 / 43


    ...and COST!!!
    Brembo F50;.......................US$2,995
    Brembo Lotus;.....................US$2,595
    Prodrive;.............................US$1,999
    StopTech;...........................US$1,695
    Stock with pads & fluid;....... US$130

    R32 GTST
    Front rotors (diam x thk) - 280×30

    R32 GTR (Non V-Spec,)
    Front rotors (diam x thk) - 296×32

    R33 GTST
    Front rotors (diam x thk) - 296×30 Different caliper to R32 GTR but same disc diameter.

    R32 GTR V-Spec / R33 / 34 GTR with Brembos
    Front rotors (diam x thk) - 324×30

    R34 GTT
    Front rotors (diam x thk) - 310x30

    The calipers that suit larger diameter discs have longer mounting legs to space the caliper out further.

    taken from:
    http://www.timeattack.com.au/forum/v...dc5f944677cdd0

    Center to center for caliper mouting holes:
    WRX Sti 2004 Brembo rear : 4.5 inches

    R32 GTS-T/GTR rear 2 pot rear: Approx 4.5 inches (will mesure when the swap is done if it works)

    *A note on the conversion: the Caliper fits. however it uses banjo bolts, and my APP SS braided line fit, but I had to really work it.
    Also, the edge of the brake pad sits about 1mm outside the disc which is not that great. Make alot of noise because of this
    Marc-André
    _________
    2.2L RB20 GTS-T
    ECU modification enabled - PM me for details
Working...
X