Nissan 370Z Forum - View Single Post - Brake temp after cool down lap at rotor and caliper

BGTV8 · 01-28-2014, 03:32 PM

As a comparison, my Z34 sees ~250C rotor temps after a cool-down lap following a half-hour session at Philip Island GP circuit (which is quite high speed, but only has 2 "big" stops and a couple of more moderate stops). A "big" stop is one which requires coming back 3 or 4 gears and a moderate stop is 1 or max 2 gears - anything else I call a "lift-and-dab". This is in a 105-108 second lap and cool downs are maybe 2m30s from the chequered flag to being back into the paddock and ready to park.

It is a stocker (no weight reduction) but with special-order DBA rotors (DBA2750 special metallurgy and heat treatment for Robinson Racing who run Falcon GT's in the Australian Production Car Championships - I got a couple of sets for my Z34 as a favour from one of their sponsors and made hats to suit), Akebono calipers and the Stillen "baby" 2" ducts fed from the fangs in the bumper. I use Endless MX72, Ferodo DS2500 and/or PMU HC+ pads depending upon what is available when I need pads. Tyres are currently Yoki A048R.

600-degF is perhaps a little high, but that is without knowing exactly what circuit you are referring to, the nature of its braking demands and the duration of the cool-down lap. IMHO, the most significant factor will be to ensure that the rotor can cool evenly which implies rolling the car forward (or back) about a quarter rotation of the wheel every 90 seconds such that the pad is not sitting on the same spot on the rotor for more than 90-seconds at a time. This will stop the pad "heat-treating" just one part of the rotor friction surface which can be a cause of brake pedal pulsation as the pad bites differently on the segments of the rotor that have seen differential cooling. I'd not stop rolling the car until rotor temps are under 150 degC

FWIW

RB

01-28-2014, 03:32 PM	#31 (permalink)
BGTV8 A True Z Fanatic Join Date: Dec 2009 Location: 03350 Australia Posts: 1,514 Drives: 09 Nissan 370Z M6 Rep Power: 39974	As a comparison, my Z34 sees ~250C rotor temps after a cool-down lap following a half-hour session at Philip Island GP circuit (which is quite high speed, but only has 2 "big" stops and a couple of more moderate stops). A "big" stop is one which requires coming back 3 or 4 gears and a moderate stop is 1 or max 2 gears - anything else I call a "lift-and-dab". This is in a 105-108 second lap and cool downs are maybe 2m30s from the chequered flag to being back into the paddock and ready to park. It is a stocker (no weight reduction) but with special-order DBA rotors (DBA2750 special metallurgy and heat treatment for Robinson Racing who run Falcon GT's in the Australian Production Car Championships - I got a couple of sets for my Z34 as a favour from one of their sponsors and made hats to suit), Akebono calipers and the Stillen "baby" 2" ducts fed from the fangs in the bumper. I use Endless MX72, Ferodo DS2500 and/or PMU HC+ pads depending upon what is available when I need pads. Tyres are currently Yoki A048R. 600-degF is perhaps a little high, but that is without knowing exactly what circuit you are referring to, the nature of its braking demands and the duration of the cool-down lap. IMHO, the most significant factor will be to ensure that the rotor can cool evenly which implies rolling the car forward (or back) about a quarter rotation of the wheel every 90 seconds such that the pad is not sitting on the same spot on the rotor for more than 90-seconds at a time. This will stop the pad "heat-treating" just one part of the rotor friction surface which can be a cause of brake pedal pulsation as the pad bites differently on the segments of the rotor that have seen differential cooling. I'd not stop rolling the car until rotor temps are under 150 degC FWIW RB Last edited by BGTV8; 01-28-2014 at 03:34 PM.