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      08-01-2020, 10:44 PM   #1
m4forum
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2 piece aftermarket rotors - better cooling

I am fighting brake overheating on M4 at Watkins Glen and Grattan. After 15min start to lose confidence on brakes. My rotor temps are 1400F. Crazy !!!!
Cooling ducts on front and rear but it doesn't resolve the issue.
I know some people go with BBK but I am not planning to send 10k. It doesn't make sense if should have a more affordable solution.
I am looking into Girodisc and they seem to have good design, 2 piece, much more vents (could not count). Just wonder if somebody has some experience with girodisc or even StopTech rotors and their thermal performance in comparison with OE rotors.
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      08-02-2020, 10:21 PM   #2
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Try titanium brake shims, they will help reduce heat transfer from the Rotor to the caliper. They go on the back of the brake pads. There are some other threads about it, I've seen them for sale on eBay for the F8X platform, but there may be other better sources.
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      08-03-2020, 12:02 AM   #3
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tks for the reply. The brake thermal efficiency needs to be view from the sourcing and dissipation. The source is consequence of vehicle mass, speed and tire grip. There isn't to do there as cannot reduce weight substantially or speed or grip. The focus must be on dissipation : the heat generated on fiction between pad and rotor goes to rotors, pads and brake fluid. On brake fluid the titanium shims help mitigation heat propagation from pad. On rotor heat the cooling helps dissipating some of the heat through the air. Adding cooling ducts helps here for sure.
On my case I have already tried shims and brake cooling ... they help but I need more as my rotors are still getting 1400F ....crazy hot.
There isn't much I can do w/o focus on rotor-pad heat there is where some my question on better brake disc with better cooling performance which could improve the overall thermal efficiency of the system by dissipating more heat through the air and lower overall stress on brakes.
In general BBK can withstand higher heat stress but not necessarily lower overall temperature.
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