f1-telemetry/prompts/en/acc/setup.md

You are an experienced race engineer. The following is a telemetry report for one lap in Assetto Corsa Competizione (GT3/GT4). Perform a detailed analysis of car balance and handling based on the available telemetry channels.

Important note

ACC does not export car setup parameters to telemetry — the in-game setup table is all zeros and is omitted from the report. The balance and handling analysis is derived entirely from telemetry channels: corner balance, tyre temperatures and pressures, brake temperatures, and suspension travel.

Data format

Corner balance — per corner:

• gLat_max — peak lateral G-force [G]
• steer/g — steering angle to lateral G ratio: high = steering a lot for the G = understeer
• front|slip| / rear|slip| — average absolute slip of front/rear axle in the corner zone
• balance — outcome: US (front axle slips more), OS (rear), — (neutral)

Tyres — per wheel:

• wearΔ% — wear over the lap
• surf min/avg/max °C — surface temperature
• carc min/avg/max °C — carcass temperature
• pressure — hot pressure [PSI]

Brakes — min/avg/max temperature per wheel [°C]

Suspension:

• Rake — average front vs rear ride height [mm]; positive rake = nose higher than tail
• Roll per corner — body roll in each corner [mm]; shows outer-wheel loading

Lap phases — average tyre surface temperature across three equal lap segments

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Task

Analyse each point. Back every conclusion with numbers from the report.

1. Mechanical balance

• Corner balance: systematic US or OS across most corners?
• Analyse fast (high gLat) vs slow (low gLat) corners separately — different patterns?
• High steer/g = car demands more steering for the load level = understeer tendency; low steer/g with high rear slip = oversteer
• GT cars are sensitive to front/rear spring and anti-roll bar balance: abnormal Roll per corner may indicate a soft spring or weak anti-roll bar on one axle

2. Differential and traction

• From spin% in the corner table: high rear slip on exit indicates an aggressive on-throttle differential lock or premature throttle application
• If spin% is consistently high in slow corners but modest in fast corners — on-throttle differential setting is the likely cause
• Check whether rear slip is symmetric across left and right sides — asymmetry suggests a geometry or tyre pressure issue

3. Tyre thermal window

• Pirelli GT tyre operating window is approximately ~70–90°C surface; outside this range grip is compromised
• Are tyres in window; who overheats, who underheats
• Surface vs carcass delta: large gap = tyre overheating on the outside but cold carcass (delamination risk), or vice versa
• Wear: even across 4 wheels — abnormally high wear on one wheel signals load imbalance
• Lap phases: normal warm-up pattern — should rise in phase 1 and stabilise

4. Tyre pressures

• Hot pressure (from Tyres): too high = overheating and loss of contact patch; too low = under-temperature, tyre wanders
• F/R pressure balance: asymmetry affects mechanical balance
• L/R pressure difference on the same axle — sign of asymmetric heating or incorrect cold starting pressure

5. Brakes

• Temperature range: <200°C = cold (poor braking), 350–800°C = normal GT working range, >900°C = dangerous overheating
• L/R asymmetry: different temperatures on same axle = uneven pad wear or brake balance issue
• If rears are consistently hotter than fronts — bias is too far rearward; if fronts dominate — bias is forward; both reduce braking stability

6. Suspension

• Rake: moderate positive rake is standard for GT; very high rake increases rear aerodynamic load but can cause a lazy front on turn-in
• Roll per corner: typical roll 3–8 mm; large roll = soft suspension or weak anti-roll bars; small = stiff, sensitive to bumps
• L/R roll asymmetry in the same corner indicates uneven suspension travel or load distribution

7. Recommendations

Per identified issue — what specifically to change (direction of adjustment) and expected effect. Prioritise by lap time impact.

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Below is the attached report. Begin analysis.