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Revised tire model set for Assetto Corsa Competizione version 1.9

A major update for Assetto Corsa Competizione is set to be released along with the upcoming 2023 GT World Challenge DLC, and with it comes a large number of changes to the overall physics of the racing simulation from Kunos Simulazioni and 505 Games.

The version 1.9 update is the first dramatic physics update since November 2021, aptly titled “Version 1.8”.

Aristotelis Vasilakos, Head of Vehicle and Handling R&D at Kunos Simulazioni, took to his YouTube channel on Saturday to present the new tire physics that will be included in ACC v19.9. These physical changes affect and update areas such as tire pressure and tire temperature ranges.

Tire pressure range and flex changes

In short the pressures have a wider window to work in which also works more realistically with alignment to give the tire more or less flex, traction, movement, lateral support and how much heat is being generated at different points on the tyres.

In theory, it should no longer be possible to find “perfect” grip at 26.5psi.

How the tire flexes becomes more apparent. Using different pressures from front to back can increase stability or aid in rotation.

In theory, a high-speed, high-downforce corner requires higher pressure to provide more support and less tire flex. A slow speed, low downforce corner requires less pressure to offer more flex to help turn the car. It’s up to you to find the sweet spot.

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Tire temperature range adjustments

There is now a slightly wider tire temperature range with a core of 70°C to 100°C but potential flash lows of 50°C and highs of 120°C.

This means that monitoring the difference between outside and inside temperature is still crucial, with suspension alignment – ​​camber and toe-in – having the main impact on tire surface temperatures.

High negative toe positions banned

The revised tire model works in symbiosis with alignment changes, with updates that affect each tire differently on the car.

As a result, according to Aris, there will be more vehicle spin under acceleration, meaning negative toe setups should be banned.

Assetto Corsa Competition Version 1.9

Thanks to the tire temperature tweaks mentioned above, setups with ridiculously high negative toe or camber values ​​should overheat the tires and negate any advantage.

For example, a high negative toe-in value should now overheat the inside of the tire, while at the same time the outside of the tire will be too cold.

As confirmed in the stream, this affects all tires of all vehicle types within Assetto Corsa Competizione.

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“One negative trail is unrealistic, too much negative trail shouldn’t bring the performance benefit that there is in version 1.8,” explained Vasilakos.

“It doesn’t mean some [real world] Teams don’t use the negative toe occasionally or in specific situations, but they keep it in very small numbers and usually don’t even think about it because you can gain rotation in other areas.

“We don’t go and say ‘we limited the negative toe’ and that’s it. If we had done that, we would never have found the limits of our physics engine.

“Now we know that and we’ve tried to overcome it and make it more realistic.”

For now, the version 1.9 update is only available for PC alongside the latest DLC, with consoles expected to follow at a later date.

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Of course, these are only the most important overview points, our most important findings. Watch Aris’ full stream embedded above for the detailed breakdown, and also tune in to his second stream, which will cover suspension changes on April 16, 2023 at 6pm BST.

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