Hi everyone ,i just found a problem on slick tyres of the FBM,
while in the early section of a long race,the tyres heat and got a little bit yellow on the insaide,and after a few laps (over 10) ,the high temprature part began to cool down,and hard to heat up again.,making it easy to drive fast.
The XFG doesn't have such a problem
i was wondering if a real slick tyred race car has such a phenomenon? if so ,why it happens?

FBM is a RWD, and it has more power, and its overall totaly diffrentt car. XFG simply not have to heat the tyres mega hot in race.

Quote from manneF1 :

FBM is a RWD, and it has more power, and its overall totaly diffrentt car. XFG simply not have to heat the tyres mega hot in race.

ye ,but in F1 the tyres become awful at the end of the race because of wearing this year,the FBM's tyres are wearing and getting thinner,but cooling down after some laps ,and make the car easy to drive.
just don no why it cools down

The tyres cool down after a few laps due to tyre wear - the tread thickness reduces, so becomes less insulating. In other words, the tread can't hold as much heat, so the tyres cool down quicker.

For longer races, it's fairly common practise to let the tyres overheat a bit for the first few laps, till they wear enough to cool down a bit. They usually manage to keep the temperature fairly constant after that, providing you're driving fast enough and the pressures + camber are correct.

As they get very thin, they start loosing heat even faster and then get too cold.


Regarding F1 this year, in most races the harder compound tyres are perfectly capable of lasting the whole race. They've often been described as being able to 'run all day'.
However, the recent races where they've degraded too quickly is mostly down to them overheating - either because the track is so slippery they're sliding all over the place and generating a lot of heat from friction, or because the ambient temperature is very hot.
The reason F1 tyres (and most racing tyres) degrade so much is because as they get very hot, the rubber starts to melt and they start graining very quickly.

Unfortunately, graining isn't simulated (yet?) in LFS, so the tyres don't compare very well to certain racing series (sprint tyres) or conditions.

Tyre degredation isn't modeled in LfS, only wear and heat is (erroneously, but still)...

Quote from Degats :

The tyres cool down after a few laps due to tyre wear - the tread thickness reduces, so becomes less insulating. In other words, the tread can't hold as much heat, so the tyres cool down quicker.

While true, this also means the tyre should also warm faster when generating heat (given the same energy input to the system).

In my own tyre heating model I have found that temperatures simply swing more as the tread wears, and if anything the average temperature continues to increase as the heat conducts deeper in to the carcass, sidewalls, and pressurised air, meaning less heat can be lost from the tread into these areas.

I don't see why the LFS model would differ from my own in this regard.

Quote from lxl89 :

ye ,but in F1 the tyres become awful at the end of the race because of wearing this year,the FBM's tyres are wearing and getting thinner,but cooling down after some laps ,and make the car easy to drive.
just don no why it cools down

That is because when slick tyre treads thin out it is very hard to maintain core heat(heat up and cool down quickpy)


Edit: didnt see degAts pozt

Written on my iPod.

Quote from Bob Smith :

While true, this also means the tyre should also warm faster when generating heat (given the same energy input to the system).

In my own tyre heating model I have found that temperatures simply swing more as the tread wears, and if anything the average temperature continues to increase as the heat conducts deeper in to the carcass, sidewalls, and pressurised air, meaning less heat can be lost from the tread into these areas.

I don't see why the LFS model would differ from my own in this regard.

Good point (I hadn't actually thought it through that much, mostly repeating what had already been said on the forum )

I would have thought that the primary loss of heat would be into the external air (+ track) rather than the internals anyway, as the temperature difference would be greater. Been a few years since I did any kind of thermal physics, so I can't be sure.

Thinking about it properly, I would expect less heat generation from the tread itself as the tyre wears, as there is less rubber to move around. I don't know how much of a significant impact this would make, if any, though.

I thought the extra heat when 'new' was caused by the
actual contact patch having a varied pressure on the
ground due to camber, as the tire wears out, the 'higher'
parts wear down to the surrounding thread, evening out
the pressure across the contact patch and consequently
overheated less.