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Tuning With Tyre Pressures

Tuning With Tyre Pressures


Tyre pressures vary depending on how grippy or slick the track surface is. If a track has a lot of grip, such as a tacky track, it requires higher tyre pressure. This makes the tyre contact patch smaller and lessens the tyre grip on the track surface. A higher tyre pressure will loosen up the chassis, especially when used at the right rear. As the track becomes slick and corner speed is reduced, tyre pressures are generally reduced to enhance traction. The tyre grip is improved because the lower inflation pressure creates a larger footprint, lowers the tyre spring rate, and moves the contact patch closer to the car during cornering.


Here's a guide on how to approach tyre pressures:


Initial Setup: Start with the recommended tyre pressure from the tyre manufacturer or your setup book from your chassis manufacturer.


Track Conditions: Consider the track conditions. A wet or tacky track might require higher pressures for more grip, while a dry/slick track may benefit from lower pressures for better traction.


Experimentation: Begin with small adjustments, changing pressures by 1 or 2 psi at a time. Monitor the car's behaviour on the track, paying attention to how it handles and the feedback from the driver.


Effect on Handling: Higher pressures often lead to a stiffer tyre, improving corner entry but potentially reducing traction. Lower pressures can increase tyre contact patch and traction, especially during acceleration.

Consistency: Keep an eye on tyre temperatures. Consistent temperatures across the tyres on the back of a sprintcar indicate balanced pressure and a good setup.


Driver Feedback: Communicate with the driver to gather insights on how the changes feel. Adjustments should align with the driver's preferences and driving style.


Fine-Tuning: As you narrow down the ideal range, make smaller adjustments for fine-tuning.


Record Changes: Keep a record of your tyre pressure adjustments along with track conditions and the car's performance. This helps in building a setup database.


Bleeders: Typically, bleeders are installed on each tire of the sprintcar. They consist of a small valve connected to the tyre's inner tube. This valve has a small hole or channel that allows air to escape from the tire when at a specific pressure. During a race, as the tyres heat up and the pressure increases, the bleeder will allow air to escape as the valve opens. Bleeders allow a controlled amount of air to escape, reducing pressure to the desired level. By doing this, they can maintain optimal tyre pressure as the race progresses. However, it’s also important to note that when tyres cool down, possibly on a restart after many rolling laps, these bleeders do not add air back into the tyre. Bleeders are only required when the tyre will build excessive heat, thus increasing the pressure, and reducing the tyre contact patch.



Remember, tuning a sprintcar is a dynamic process, and multiple factors contribute to performance. Tyre pressure is just one element, so it's essential to consider other adjustments like shocks, wing position, and gear ratios for a comprehensive setup.

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