How does brake temperature work? Heat dissipation, brake fade, management strategies

Discussion in 'Automobilista 2 - General Discussion' started by Roar McRipHelmet, Apr 3, 2022.

  1. Roar McRipHelmet

    Roar McRipHelmet Well-Known Member AMS2 Club Member

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    Many of us struggle with simple algebra when trying to do fuel calculations in our head during a race. If you thought that was difficult, try doing differential calculus to solve heat dissipation equations for the brake temperatures! ;)

    I have so many questions:
    • How do I manage brake temperatures across the length of a race in cars that don't have brake duct adjustments?
    • When do brakes overheat? Should the temperature always be kept in green, or is it safe to let it creep into yellow/orange as long as it returns to green? When do the brakes start to fade?
    • Do overheated brakes get back to normal condition if I let them cool, or are they left with permanent brake fade?
    • Should I adjust brake balance so that temperatures are similar in front&rear?
    • "Cold brakes" is a common excuse on the first lap in ACC. Is there a similar performance hit with cold brakes in AMS2? Because to me there doesn't seem to be much difference between cold and optimal brakes.
    • Other than by looking at the brake temperature widget, how do I know how careful I need to be on the pedal in a braking zone? Can I use telemetry and tactile transducers to give me a warning?

    Two examples of cars that are particularly difficult to manage brake temperatures with:
    • Ultima GTR Road
    • Caterham 620R
    I thought these cars are track day specials which are meant to last more than 5 minutes before the brake temperatures are in the yellow/orange? :(
    I'd like to learn how to manage the temperatures better!
     
    Roar McRipHelmet, Apr 3, 2022
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  2. MasterLooser

    MasterLooser Greyhat DWORD Developer Staff Member AMS2 Club Member

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    i notice longer brake distances when coming out of the pits with cold brakes, aspecially if into t1 i brake at the same point, i cant make the turn at all (adelaide turn right after the chicane)

    managing brake temp can pretty much only be done by braking less.
    essentially driving like you are fuelsaving, get of the gas and let her roll a bit, and then step on the brakes to have lots of braking as short as possible.
    alot of cars seem to have faulty brake temps, eg the superkart, after one lap your brakes are in the red and wont really get down anymore.

    i could look up for you at what point the brakes stop being at 100% but the question is what does it really matter, if they turn yellow u will notice them being worse
    just try a car that has little downforce but locks up easily, ull notice the brakes lock up alot less with yellow/red brakes due to not having the grip anymore
     
    MasterLooser, Apr 3, 2022
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  3. CrimsonEminence

    CrimsonEminence Custom Title Staff Member AMS2 Club Member

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    Brake earlier, lift&coast.
    Yellow/orange is still okay, but can cost brake health.
    Steel Brakes are still working at 700°C
    Carbon Brakes are still working at 1200+°C
    Higher temps will still influence lifetime.
    As long as the brakes aren't destroyed they will be usable again, when cooled down after overheating. Brakes will still fade due to heat and application though.
    Difficult one, because your car balance could suffer. Best to set brake bias more reawards for the warmup and then setting it back to more drivable states so you don't get nervous brake behaviour into corners.
    There is a difference. Brakes in the "blue" area aren't as consistent and lock up easier in combination with cold tires or don't grab very good.
    Not sure here, i think it's also highly tire and car dependent.
    I have the impression, these two might need an update to their brake heating tbh.
     
    CrimsonEminence, Apr 3, 2022
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  4. Maser V6

    Maser V6 Assume nothing._ Verify everything._Have fun AMS2 Club Member

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    In addition to above.(Cr) Engine braking increase may help, some cars benefit to my style of driving certain cars when I increase this, but changing down too early has obvious pitfalls.
     
    Maser V6, Apr 3, 2022
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  5. MasterLooser

    MasterLooser Greyhat DWORD Developer Staff Member AMS2 Club Member

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    the absolute best temp on the ultima is 500°C, everything above or below will lower your brake performance, even 1°C off
    the falloff seems pretty minor tho, the calculation is pretty disgusting to look at so i am not gonna bother reversing this lol

    a difference of 30°C from ideal results in 99.67% of max brake performance, the curve is prolly steeper the further u get off
    temps in kelvin, value - 273,15 = celcius
    [​IMG]
     
    MasterLooser, Apr 3, 2022
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