🟢 Verified Guide • Sim Pit Technical Engineering Guild • 7 min read

Sim Racing Telemetry: ACC & F1 24 Cold Pressures, Optimum Windows & Track Temp

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Published by Sim Pit Technical Engineering Guild • Updated for 2026 Season

📋 Step-by-Step Instructions

Step 1: Target the ACC 26.5 PSI Hot Pressure Window

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.

Step 2: Apply the 0.1 PSI per 1.0°C Track Temperature Formula

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.

Step 3: Calculate Circuit Energy & Load Heat Expansion

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.

Step 4: Monitor F1 24 Surface vs Carcass Temperatures

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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❓ Frequently Asked Questions

How many laps does it take for tyre pressures to stabilize?

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.

Should left and right tyre pressures be identical in the garage?

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.

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