[Fot] Spit/GT6 Race Pads

[fubog1]

 The rotor speed is obviously the same inside & out but in terms of the swept area of the pad, as you move out from the centerline, the larger diameter means that the speed of the disc relative to the pad increases, more heat, higher wear.I have all of mine tapered straight down the sides, no angle cut @ bottom, but that serves the same function.Once you get the taper right, you can use all of the pad...
Glen Efinger

    On Wednesday, July 3, 2024 at 03:11:30 PM EDT, JS Performance Motoring, LLC <jason at jsperformancemotoring.com> wrote:   

 Hi Scott,      I've attached a picture showing what I was referring to as far as pad shape.
I've started rotating between two sets of pads each race weekend.  I true them up between races.   It's not extreme, but there's enough taper wear during half of a weekend that I notice a slightly better pedal feel after swapping them out.  

Jason SukeyJS Performance Motoring, LLC
440.984.7720jason at jsperformancemotoring.com
https://www.facebook.com/JSPerformanceMotoring/


On Wed, Jul 3, 2024 at 2:51 PM Scott Janzen <sjanzen at me.com> wrote:

OK, I’m confused and hoping to learn something here.I agree, the pads wear more on the outside, I’m guessing in part also due to the higher velocity of the rotor at that point, in addition to the heat - related issues.However, if you get the friction material shaped as a trapezoid, doesn’t that result in either:a) the piston stays square, the back of the pad stays square against the piston, and the outer edge of the pad is the only part contacting the rotor and it just wears down until there is full contact, orb) the pad surface rests square against the rotor, the back of the pad is at an angle, forcing the piston to cock in the bore and causing more wear on those parts?
Personally, when the pads get worn to the point where there is noticeable taper, I generally have found they are well more than half gone and I just replace them.  I like my brakes to be at max performance.  Same deal with rotors - especially stock ones are cheap for these cars, though I have gotten to splurging on the grooved, dimpled ones that do seem to provide a bit better braking and longer life of all components.

On Jul 3, 2024, at 12:25 PM, JS Performance Motoring, LLC via Fot <fot at autox.team.net> wrote:
Glen, great point!
Seems that many race pad manufacturers try to give us the most material for our money with a big, rectangular friction material puck.  This definitely works against us with the ancient, two piston calipers we run.  More heat, and more surface speed out towards the edge of the rotor is a recipe for radial taper.
I've found with enough complaining, I can get them to change the shape of the pad to a trapezoid, and it really does help as you say.  It doesn't eliminate taper on my GT6 that's brutal on brakes, but it is a big step in the right direction.
In lieu of a properly designed friction puck, I sometimes use a big file to adjust the shape of the friction material to accomplish the same thing.
Running a thick spacer behind the pad as they wear down also helps keep the pistons true to the bore, and reduces heat transfer to the fluid/seals.

Jason SukeyJS Performance Motoring, LLC
440.984.7720jason at jsperformancemotoring.com
https://www.facebook.com/JSPerformanceMotoring/


On Wed, Jul 3, 2024 at 12:14 PM fubog1 via Fot <fot at autox.team.net> wrote:

 Another point to consider re pad selection, & I don't see mentioned, is make sure that the pads have the correct taper ie backer flat down, the profile of the pad side should taper down towards the center of the disc/bottom of the pad to some degree, a trapezoid with the long side up, ie not be rectangular shape.Reason is that a lot more heat is generated towards the OD of the disc, & they'll wear more; having less friction surface towards the bottom of the pad w/a taper evens the pad wear, & it won't develop the other form of "taper", that usually requires that 1st brake pedal stab as the rectangular shaped pads do as they wear.
This applies to all TRs.I've also seen many cases where "interchanges" don't consider the shape of the pad, although the pads are dimensionally correct & fit.
Glen Efinger

    On Monday, July 1, 2024 at 04:43:42 PM EDT, Mark Fisher via Fot <fot at autox.team.net> wrote:   

 Hi All:
What do you racers like for front pads on your Spits and GT6s?
Thanks in advance,
Mark Fisher
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