Mexico City FIA F4 iRacing Track Guide: Official Baseline Data

This track guide is built from the exact Valor Official Baseline for Mexico City Grand Prix in the FIA F4 car. Values come from the September 28, 2026 baseline pack's canonical CSV, reviewed corner map, and turn profiles—not invented braking boards or reconstructed internet lap data. The CSV records speed, brake, throttle, steering, gear, RPM and position. Speed has been converted from m/s to mph, and braking is the 0–100% telemetry channel. Turn numbers are Valor map segments for this exact layout and may differ from circuit promoter numbering. Track conditions, tyres, setup and fuel change the best targets; treat these measurements as a reference, not a universal prescription.

Baseline snapshot

• Exact car/track combination: FIA F4 — Autódromo Hermanos Rodríguez, Grand Prix

• Valor-reviewed mapped turns: 18

• Brake-positive mapped segments: 9 of 18 (recorded peak brake above 0%; includes light modulation)

• Recorded reference maximum speed: approximately 138.5 mph

• Telemetry-integrated reference time: approximately 1:43.98

• Turn-profile confidence average: 100.0/100

• Recorded samples: 6,233

The telemetry-integrated time is estimated from the supplied position and speed trace because the baseline CSV has no official simulator lap-clock channel. It is not a verified iRacing session result.

Why this FIA F4 guide is relevant

The FIA F4 Challenge Fixed schedule visits Autódromo Hermanos Rodríguez Grand Prix starting October 27, 2026 (2026 Season 4, Week 7). The guide remains useful for the same car and layout outside that race week.

What the baseline says about Mexico City in FIA F4

Mexico City's F4 baseline divides into three distinctive jobs: high-speed braking at the start of the main complexes, managing a slower linked middle, and maximising traction out of the final stadium-sector corners. The reference peaks at about 138.5 mph.

The biggest braking anchors are Valor-mapped Turn 4 (82.9% peak brake; roughly 119.8 to 52.7 mph) and Turn 1 (78.5%; roughly 138.2 to 59.4 mph). Turns 14 and 15 form another important low-speed sequence: 65.9% and 59.3% peak brake, with Turn 15 reaching the trace's slowest mapped speed, about 41.8 mph in first gear.

Do not apply a heavy-braking recipe to the quick Turns 8–13. In the supplied trace Turn 8 has just 8.1% peak brake, Turn 11 20.7%, and several of the linking elements no meaningful brake signal. The first mistake can be excess steering or a compromised position entering the next bend.

Turn-by-turn baseline guide

Turn 1 — right. The reference starts this mapped section around 138.2 mph, reaches about 59.4 mph in gear 2, and exits around 59.6 mph. Peak recorded brake is 78.5%. This is a major braking event. The largest mapped speed drop. Treat it as a braking-and-rotation test, not simply a later-braking contest.

Turn 2 — right. The reference starts this mapped section around 59.4 mph, reaches about 59.4 mph in gear 2, and exits around 60.3 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. This short linking element is not a second heavy stop; the preceding exit dictates its options.

Turn 3 — right. The reference starts this mapped section around 64.2 mph, reaches about 68.6 mph in gear 2, and exits around 81.7 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. Build speed cleanly out of the sequence; a braking spike here deserves a review of the earlier line.

Turn 4 — right. The reference starts this mapped section around 119.8 mph, reaches about 52.7 mph in gear 2, and exits around 52.7 mph. Peak recorded brake is 82.9%. This is a major braking event. The heaviest measured braking peak on this lap. The mapped segment ends at its minimum; carry the analysis into Turn 5.

Turn 5 — right. The reference starts this mapped section around 52.1 mph, reaches about 48.2 mph in gear 2, and exits around 61.1 mph. Peak recorded brake is 9.3%. Only light brake modulation appears. A low-speed follow-through where the car must be positioned before committed throttle.

Turn 6 — left. The reference starts this mapped section around 63.5 mph, reaches about 50.0 mph in gear 2, and exits around 51.1 mph. Peak recorded brake is 32.8%. The trace contains a meaningful brake event. A clear secondary speed-reduction event. Compare release shape and wheel load rather than only peak pressure.

Turn 7 — left. The reference starts this mapped section around 53.1 mph, reaches about 53.1 mph in gear 2, and exits around 68.7 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. Use the no-brake transition to restore exit speed without needless corrections.

Turn 8 — left. The reference starts this mapped section around 93.1 mph, reaches about 90.6 mph in gear 4, and exits around 92.6 mph. Peak recorded brake is 8.1%. Only light brake modulation appears. A light-brake momentum corner. Smooth steering is a larger opportunity than a deep brake spike.

Turn 9 — right. The reference starts this mapped section around 93.7 mph, reaches about 93.8 mph in gear 4, and exits around 97.4 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. The baseline has no meaningful brake. Keep the sequence flowing.

Turn 10 — left. The reference starts this mapped section around 97.7 mph, reaches about 99.2 mph in gear 4, and exits around 102.7 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. Maintain speed and lane placement; do not over-slow a linked turn.

Turn 11 — right. The reference starts this mapped section around 102.6 mph, reaches about 88.4 mph in gear 4, and exits around 91.0 mph. Peak recorded brake is 20.7%. The trace contains a meaningful brake event. A modest brake event; watch release and the ability to accelerate into Turn 12.

Turn 12 — left. The reference starts this mapped section around 92.5 mph, reaches about 92.5 mph in gear 4, and exits around 97.5 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. Focus on momentum retention through the direction change.

Turn 13 — right. The reference starts this mapped section around 97.8 mph, reaches about 97.8 mph in gear 4, and exits around 110.1 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. An acceleration-focused exit. A correction here affects the next approach.

Turn 14 — right. The reference starts this mapped section around 119.4 mph, reaches about 76.0 mph in gear 3, and exits around 79.3 mph. Peak recorded brake is 65.9%. This is a major braking event. A strong slowdown into the technical final section. Prioritise correct line for Turn 15.

Turn 15 — right. The reference starts this mapped section around 82.7 mph, reaches about 41.8 mph in gear 1, and exits around 43.7 mph. Peak recorded brake is 59.3%. The trace contains a meaningful brake event. Slowest recorded mapped minimum in this baseline. Exit traction is the priority.

Turn 16 — right. The reference starts this mapped section around 50.6 mph, reaches about 51.6 mph in gear 2, and exits around 65.6 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. The connected segment starts accelerating again; avoid unnecessarily resetting the car.

Turn 17 — right. The reference starts this mapped section around 64.8 mph, reaches about 61.4 mph in gear 3, and exits around 61.4 mph. Peak recorded brake is 22.2%. The trace contains a meaningful brake event. A short speed adjustment; its measured window ends near the minimum, so read with Turn 18.

Turn 18 — right. The reference starts this mapped section around 68.3 mph, reaches about 68.3 mph in gear 3, and exits around 97.5 mph. Peak recorded brake is 0.0%. The baseline has no meaningful brake input within this mapped segment. The last element rebuilds speed. Aim to finish steering earlier for a stronger run down the straight.

How to use this guide with Valor

Use Turns 1 and 4 as the high-speed stopping references: compare onset and release before comparing the speed at the slowest point. For Turns 14–15, evaluate the sequence together; a poor line into Turn 14 can force a corrective brake or throttle delay in Turn 15.

Then analyse the low-brake sections as momentum and steering-demand tests. In Valor, compare entry, rotation and exit in order. If the driver carries the right minimum speed but loses time after it, prioritise steering unwind and the point full throttle becomes sustainable.

Data basis and interpretation

Source: Valor Baseline Data Pack 2026.09.28.1; exact combo mexicocitygp_grandprix_formulair04. The profile minimum, peak brake and corner window are from Valor's reviewed turn profiles. Mapped segment entry/exit speed and gear at the minimum are read from the raw sample trace. Some complex turns and overlaps in the reviewed map have boundary/validation warnings; treat closely grouped turns as a sequence. Exact target speeds and gears can shift with conditions. This content is an educational baseline comparison, not live personalised coaching.

Further reading on Valor: How to Analyze iRacing Telemetry and Actually Find Lap Time; What Telemetry Baselines Actually Tell You in Sim Racing.