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DefSport Lightweight 12.2" AutoX Brake Kit

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  • DefSport Lightweight 12.2" AutoX Brake Kit

    This is an interest thread on if people are interested in a lightweight 12.2" diameter, scalloped rotor kit designed more around the braking and lightweight requirements of an autox targeted brake kit vs. the more track focused sizing of my other kit.

    My thoughts are to use spacers between the hat and rotor to use a 0.81" thick scalloped rotor, or even a drilled non-scalloped rotor for a slight weight penalty in STX or a class that restricted you to OEM or greater sizing in all dimensions and no scallops. The 0.81" rotor just works out for non-ABS S13s, but is actually thinner than ABS S13 rotors (so the 1.25" rotor kit would work there at a greater weight penalty).


    The kit pricing would probably be in the ~$1200/kit range with pads and everything you need except lines, but with enough volume I can probably throw in lines as well for that price. I can also offer high heat capacity autox pads like Hawk DTC-30s.

    Target weight would be about 11 lbs per corner, which is lighter than just a stock non-ABS S13 rotor at 11.25 lbs according to Centric. Braking heat capacity would also be higher than stock rotors by a mile, with a more rigid 4 piston Dynapro caliper.


    Any interest?
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

  • #2
    So no one interested in lighter weight aftermarket brakes for autocross usage? I would have figured the autox guys would be pretty interested in this.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

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    • #3
      Originally posted by Def View Post
      So no one interested in lighter weight aftermarket brakes for autocross usage? I would have figured the autox guys would be pretty interested in this.
      I somehow missed this thread. I'd be up for a kit, but I'm not sure that will work for me. I'm trying to fit under some spinwerks 15"s. The radial clearance is only (I'll have to check my notes to be sure) about 6.5" so those calipers would work with a max of an 11" rotor. That would require re-engineering everything, assuming the calipers even fit over the mounting ears, so that sounds like a non starter.

      I've considered going to 275/35/17s, which would fix the clearance issue, but I want to try the 15s since I have most everything in the garage.

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      • #4
        Yea, the tiny wheels a lot of guys use don't really lend themselves to larger brakes. There's also not much in the way of stuff smaller that works with the hats. 11.75" is the only other size, and I'm not 100% sure that'll fit under 15's. The 12.2's will fit under some 16's, but that seems to be a forgotten wheel size when it comes to tires.

        If I had to make a new kit it'd need to be for quite a few people. I can't justify the setup charges with less than about 10 kits being made.

        Well, I'd need at least a little interest shown to produce the spacers. Thought there would be more...
        '18 Chevrolet Volt - Electric fun hatch for DD duty!


        DefSport Koni Sleeve and Spring Perch Buy!!!
        http://www.nissanroadracing.com/showthread.php?t=5902

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        • #5
          11.75" rotors fit under some 15" wheels.

          http://949racing.com/Wilwood-11.75--rotors-BBK.aspx
          winhpde.com

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          • #6
            They fit in some, but definitely not all. It's a tight fit for sure.


            If there's more interest I don't mind making an 11.75" kit, but like I said, I'd really need to be looking at 10 kits to make it feasible. Most machine shops won't touch it if it's for something like 4 parts.
            '18 Chevrolet Volt - Electric fun hatch for DD duty!


            DefSport Koni Sleeve and Spring Perch Buy!!!
            http://www.nissanroadracing.com/showthread.php?t=5902

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            • #7
              Now I'm really second guessing the 15" wheel choice. Would you need the 10 sets for the initial kit mentioned or just the re-engineered smaller kit?

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              • #8
                10 for the re-engineered 11.75" kit to make the bracket feasible.

                If I have at least 1-2 for the lightweight 12.2" setup that'll work for that. I imagine the cost won't be so high that I can't foot another kit or so to get the machine shop to look at it.
                '18 Chevrolet Volt - Electric fun hatch for DD duty!


                DefSport Koni Sleeve and Spring Perch Buy!!!
                http://www.nissanroadracing.com/showthread.php?t=5902

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                • #9
                  10 for the re-engineered 11.75" kit to make the bracket feasible.

                  If I have at least 1-2 for the lightweight 12.2" setup that'll work for that. I imagine the cost won't be so high that I can't foot another kit or so to get the machine shop to look at it.
                  '18 Chevrolet Volt - Electric fun hatch for DD duty!


                  DefSport Koni Sleeve and Spring Perch Buy!!!
                  http://www.nissanroadracing.com/showthread.php?t=5902

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                  • #10
                    Is any part of the superlite kit usable w/ this (calipers/brakets/hats)? Or is this basically a completely different setup if we want to convert over to it?

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                    • #11
                      Everything is usable from the Superlite kit except the calipers (since they call for a 1.25" width rotor).

                      The weight savings is in the scalloped 0.81" wide rotor. Hats and brackets are reused, new calipers needed.
                      '18 Chevrolet Volt - Electric fun hatch for DD duty!


                      DefSport Koni Sleeve and Spring Perch Buy!!!
                      http://www.nissanroadracing.com/showthread.php?t=5902

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                      • #12
                        Originally posted by Def View Post
                        Everything is usable from the Superlite kit except the calipers (since they call for a 1.25" width rotor).

                        The weight savings is in the scalloped 0.81" wide rotor. Hats and brackets are reused, new calipers needed.
                        sweet! in that case, there should be no problem getting your group buy numbers. just dont provide calipers or rotors (like your regular group buy). ppl who want the standard setup can get normal parts separately and those who want the autox specific setup will get those corresponding parts.

                        this is good news. time to sell my calipers and rotors :-)

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                        • #13
                          It will cost you more to procure the calipers, rotors, pads, lines etc. on your own than through me.

                          This setup uses custom machined spacers to space the rotor from the hat - hence getting enough quantity of custom parts to actually make the cost feasible. Those aren't free.
                          '18 Chevrolet Volt - Electric fun hatch for DD duty!


                          DefSport Koni Sleeve and Spring Perch Buy!!!
                          http://www.nissanroadracing.com/showthread.php?t=5902

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                          • #14
                            So is anybody interested in this? Seems like a lot of autox guys around here to not have any firm interest.
                            '18 Chevrolet Volt - Electric fun hatch for DD duty!


                            DefSport Koni Sleeve and Spring Perch Buy!!!
                            http://www.nissanroadracing.com/showthread.php?t=5902

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                            • #15
                              I would prefer a scalloped 11.75" setup, but if there is not enough interest, I might be intersted in a 12.25" scalloped .81" or .38" rotor setup.

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