[Fot] Spit/GT6 Race Pads

Wed Jul 3 13:11:03 MDT 2024

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 Sukey
JS Performance Motoring, LLC
440.984.7720
jason 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, or
> b) 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 Sukey
> JS Performance Motoring, LLC
> 440.984.7720
> jason 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
>>
>> _______________________________________________
>> fot at autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
>> Unsubscribe/Manage:
>> http://autox.team.net/mailman/options/fot/fubog1@aol.com
>>
>>
>> _______________________________________________
>> fot at autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
>> Unsubscribe/Manage <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
>> http://autox.team.net/mailman/options/fot/jason@jsperformancemotoring.com
>>
>>
>> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/sjanzen@me.com
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20240703/07a9ae46/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: padtaper.jpg
Type: image/jpeg
Size: 125741 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/fot/attachments/20240703/07a9ae46/attachment.jpg>