On the track, a few degrees can be enough to completely transform the behavior of a tyre. Too cold, it lacks grip and slips. Too hot, its tyres can lose consistency, degrade quickly and alter the car's balance.
Temperature is therefore one of the most closely monitored parameters in competition. It influences grip, pressure, wear and even race strategy.
1. Why does a tyre need to heat up?
The rubber compound of a racing tyre is formulated to function within a precise temperature range. Below this zone, it remains too rigid and does not conform as well to the micro-unevenness of the asphalt.
As the tyre heats up, its rubber compound becomes more efficient and the contact surface works better with the track.
2. The temperature comes mainly from the deformation
With each wheel rotation, the tyre deforms in the contact patch and then returns to its original shape. These repeated deformations generate heat in the carcass and tread.
Braking, acceleration, lateral support, pressure and suspension settings therefore directly influence heating.
3. Too cold: the tyre becomes difficult to operate
A tyre below its operating window can offer less grip, particularly during the first few corners after exiting the pits.
The driver must then gradually generate energy in the tyres without excessive slippage, as significant slippage can create uneven heating of the surface.
4. Too hot: the grip may also decrease
Maximum temperature does not equate to maximum performance. Beyond its ideal range, the rubber can become too soft, lose stability, and wear out quickly.
The driver then often feels a less precise car and a level of grip that degrades as the laps go by.
5. Surface temperature doesn't tell the whole story
Engineers distinguish between the temperature of the tread surface and that located deeper in the carcass.
The surface can heat up very quickly during a block or slide, even before the internal structure has reached its optimal temperature. Conversely, a very hot carcass can retain energy even as the surface begins to cool.
6. Three areas of the tyre are often compared
Teams can measure the temperature on the inside, center, and outside of the tread.
These differences provide information about camber, pressure, and how the tyre is utilizing its width. A significant temperature imbalance can indicate that one part of the tread is working harder than the others.
7. Pressure changes with heat
When the tyre heats up, the pressure of the air or gas inside increases. This is why teams pay a lot of attention to hot tyre pressure.
An initial pressure is chosen in anticipation of this climb. The goal is to reach the desired value when the tyre is actually in race conditions.
8. A few tenths of a bar can change the behavior
Higher pressure can limit some deformations but alter the shape of the footprint. Too low a pressure can increase the stress on the tyre casing and heat generation.
The setting therefore depends on the vehicle, the tyre, the circuit, the ambient temperature and the driving style.
9. The weather changes everything
A cold track absorbs more heat from the tyre, while very hot asphalt accelerates its temperature rise.
Wind, sunshine, cloud cover and even the evolution of the rubber deposited on the racing line can change conditions during the same day.
10. Driving style influences temperature
An aggressive driver when braking or accelerating can put more stress on certain tyres and cause them to heat up more quickly.
Conversely, smoother driving can preserve tyres over a long stint. Thermal management is therefore an integral part of the driver's strategy.
11. Heated blankets reduce the critical phase
In disciplines where they are permitted, tyre warmers allow tyres to be preheated before use.
They do not replace the actual temperature rise on the track, but they reduce the gap between a cold tyre and its operating zone.
12. A race can be won on the thermal window
Two cars equipped with the same type of tyre can achieve different performances if one keeps its tyres better within their ideal range.
A setup that allows the tyre to work quickly can be advantageous in qualifying. Conversely, a car that better manages its temperature and wear can perform better over a long stint.
Optimus Racing's vision
At the house of Optimus PneusThe temperature perfectly illustrates the complexity of racing tyres. Grip depends not only on the rubber compound or the tread pattern: it also depends on the ability to make the tyre work at the right time, in the right window.
On the track, a few degrees can truly transform the car. Understanding this thermal dynamic helps to better understand why engineers monitor the tyres almost lap after lap.
Optimus Racing deciphers the technique, competition and performance that take place at the point of contact between the machine and the track.
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