Front Brake Temp Log DATA

SPIR

Notice how long it takes for brakes to come up to temp – and how low my brake temps are. This is the front brake rotor (left) of my 67
Mustang with a 14.5” x 1.375 rotor – and an Alcon 6 piston Caliper. Pads used are noted in the individual photos.
There are no brake ducts installed in this car. Performance Friction web site mentions for the 01 pad compound
“Effective from 167*F and reach 2000*F, optimum operating range is between 860*F and 1004*F.”

Test is performed with a pyrometer attached to lower control arm roughly 4” away from rotor. Per datasheet of the pyrometer, this = 1.25” measurement
”circle” – aimed at the center of the pad swept area for both vehicles listed here. Data from pyrometer was logged via my custom data logger which
reads out a voltage 0-5V which then must be converted to display degrees F. The conversion has been checked to be correct by +/- 5* at multiple points within this temperature range (via torch and scrap steel… along with oscilloscope using a temp probe and a voltage probe). The pyrometer itself appears to ‘update’ ~4 times per second, the logger was set to capture data every .5 seconds.

Below: The RS-99 pad, as best as I can figure, is an old Pagid endurance race pad. Notice how cold the rotor is!!
Braking performance is improved with the use of the PF O1 Pads (above graph) by quite a lot.

Below: Log from Ray’s car – using an 11” rotor, with ducting and a PBR 2piston caliper. Performance Friction 01 pads.

Note: Rotor still takes quite a while to get up to temp, but temp is much higher than mine.
Test is same day, similar weight and speed of vehicle, but obviously much less rotor dia.

THE BIG ? Is my temp too low?

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