Sim Racing Telemetry: ACC & F1 24 Cold Pressures, Optimum Windows & Track Temp
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In ACC v1.9+, all dry GT3 DHE tyres achieve maximum contact patch grip between 26.0 and 27.0 PSI, with 26.5 PSI representing the absolute golden center. Pressures below 26.0 PSI cause sidewall flex and understeer; pressures above 27.0 PSI crown the tyre and induce snappy oversteer.
Tyre pressure scales directly with ambient air and tarmac temperature. If your baseline setup was calibrated at 25°C track temp and the race session is 35°C (+10°C hotter), lower all cold pit pressures by exactly (10 * 0.1) = 1.0 PSI before leaving the pit lane.
High-downforce, fast-corner circuits like Spa, Silverstone, and Suzuka load the outer tyres heavily, generating +3.6 to +4.0 PSI of thermal rise. Low-energy circuits like Monza produce only +2.8 to +3.1 PSI of expansion. Asymmetric circuits require lower cold PSI on loaded outer wheels.
In F1 24, maintain front tyre carcass temperatures between 100°C and 105°C, and rears between 95°C and 100°C. If rear tyres overheat during traction out of low-speed corners, lower rear tyre pressures by 0.3 to 0.5 PSI to increase heat dissipation.
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In ACC and iRacing, tyres require approximately 3 full racing laps of hard driving to build operating core temperatures and reach their stable hot running pressure.
Rarely on clockwise or counter-clockwise circuits. On clockwise tracks (e.g. Barcelona, Monza), the left-side tyres experience higher lateral loads and expand more. Therefore, start with the left tyres set 0.2-0.4 PSI lower than the right tyres.