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Thread: Brake temperature and lock of wheels

  1. #11
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by Eric Everfast View Post
    Interesting. I feel like the brakes are operating just fine for the first 6-7 laps of the race at temps that would imply that they're steel. Tires are up to temp between 80-90C as well and I have the ducts opened at 35% only
    You'd probably get away with 35% ducts at Spa/ daytona/ le mans but from experience that's really low.
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  2. #12
    Superkart Pilot PawelK's Avatar
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    Doesn't it depend on air temperature to some extent?

  3. #13
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by PawelK View Post
    Doesn't it depend on air temperature to some extent?
    Yes. 35% is something I've used at Le Mans, eg night race not in summer.
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  4. #14
    WMD Member PostBox981's Avatar
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    Quote Originally Posted by hkraft300 View Post
    Yes. When I really stomp on it (and have reasonable brake ducts) I'll get FA and prototypes to that temp.
    I keep them open enough to avoid that though, or the tyre pressures get a bit crazy.
    I was more referring to the other guys reporting a temp rise while accelerating. If I didnt get that part wrong that is.
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  5. #15
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by PostBox981 View Post
    I was more referring to the other guys reporting a temp rise while accelerating. If I didnt get that part wrong that is.
    Possibly.
    But I wouldn't be surprised if op is hitting 1200c peak temps with 35% ducts it'll take a while for the brakes to cool.
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  6. #16
    Superkart Pilot Eric Everfast's Avatar
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    Quote Originally Posted by hkraft300 View Post
    Possibly.
    But I wouldn't be surprised if op is hitting 1200c peak temps with 35% ducts it'll take a while for the brakes to cool.
    Not happening though. I brought them down to 35% because I was having a lot of trouble heating up the hard slicks. Air temp 21C / track temp 44-45C. When checking the temperature for the brakes on the 9th lap yesterday night, the fronts were in between 350 to 450C on straights whereas the rears were hovering around 550C.

    I brake pretty hard too - near lock up after the straights.
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  7. #17
    LMP2 Pilot hkraft300's Avatar
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    Quote Originally Posted by Eric Everfast View Post
    Not happening though. I brought them down to 35% because I was having a lot of trouble heating up the hard slicks. Air temp 21C / track temp 44-45C. When checking the temperature for the brakes on the 9th lap yesterday night, the fronts were in between 350 to 450C on straights whereas the rears were hovering around 550C.

    I brake pretty hard too - near lock up after the straights.
    Don't try to use the brakes to heat the tyres. It just doesn't work. You end up with hot brakes and overinflated (high pressure) tyres with no grip.

    At that temp you should be fine with the soft compound. Working tyre temp range is ~70-100c, for both compounds. If they feel slippery, check your tyre pressures are correct. (~1.7 bar front 1.3 bar rear iirc).
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  8. #18
    Superkart Pilot Eric Everfast's Avatar
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    Quote Originally Posted by hkraft300 View Post
    Don't try to use the brakes to heat the tyres. It just doesn't work. You end up with hot brakes and overinflated (high pressure) tyres with no grip.

    At that temp you should be fine with the soft compound. Working tyre temp range is ~70-100c, for both compounds. If they feel slippery, check your tyre pressures are correct. (~1.7 bar front 1.3 bar rear iirc).
    Thanks for the input. I feel like closing the ducts does aid in heating up the tires out of experience in the game however. My working tire temps for the FA are 1.7 bar in the front and 1.45 bar at the rear; simply referring to the sticky in the setup sub-section of the forum here.

    I'm about 3 seconds quicker with the softs but they wear out too quickly in a 15 lap race where the AI doesn't pit.
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  9. #19
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    Probably I did not describe my problem very well, so I re-try.

    I use a G29.

    The today race with 919HY, f/3 duct 60%:
    - straigh, 320 km/h, brake temperature about 180C
    - corner, 150 km/h, brake temperature rise up about 700C
    - about 100m after exit of corner, 230 km/h, temperature go down at 350C
    - further 100m (distances are hipotetic, just to explain the scenario), I continue to accelerate and temperature rise up to 500C (I do nothing except accelerate!) and wheels "locks" (it is not a locking as during a "classic" hard braking, with smoke and so on... the car simply don't increase its speed over 230 km/h)
    - if I contine to accelerate, brake temperature continue to rise and the car speed decrease, 200 km/h
    - I have to slight touch the brake to "release" the car (and the temperature rapidly go down), reaching >230 km/h

    Temperature too high? too low????
    Last edited by sparviero1978; 31-08-2019 at 17:31.

  10. #20
    Moderator Bealdor's Avatar
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    Check the Telemetry HUD if the brakes are applied on that second straight. If yes, your brake pedal potentiometer might be faulty.
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