F1: understanding the FIA's 35 km/h test in Austin FP1
The FIA ran a test in Austin FP1 with cars at around 35 km/h for at least three seconds at Turn 15, to measure the effectiveness of its software changes after the problems in Sepang. Mercedes kept its engine near 9,000 rpm even at low speed.

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Depois dos problemas em Sepang, quando vários carros pararam na volta de apresentação ou perderam potência, a FIA prometeu uma atualização de software já em Austin — e cumpriu. Ao fim do TL1 (primeiro treino livre), a entidade fez um teste específico, com os carros a cerca de 35 km/h, para medir a eficácia das mudanças.
O problema na Malásia nasceu de uma combinação difícil de prever. Desde Miami, em pista molhada, foram aprovados mapeamentos que limitam a potência e tornam a entrega mais suave, além de ajustes no sistema elétrico para deixar a resposta mais progressiva, a pedido dos pilotos.
Em Sepang, alguns fatores se somaram: modo de baixa aderência, a curva 9 entre as zonas de redução de potência elétrica e velocidades muito baixas nas voltas atrás do safety car. Com rotações baixas, alguns carros perderam mais potência do que o previsto e o sistema não conseguiu recuperar rápido; abaixo de certos limites, ficou difícil restabelecer a pressão do turbo.
A Mercedes, por exemplo, manteve o motor perto de 9.000 rpm mesmo em baixa velocidade, enquanto equipes afetadas operavam entre 3.000 e 4.000 rpm.
No teste em Austin, sem chuva, a FIA pediu que todos passassem pela curva 15 — uma das mais lentas do traçado e também em zona de redução — a 35 km/h por ao menos três segundos, de preferência em marcha lenta. Na Malásia, a falha apareceu justamente abaixo de 40 km/h. Não houve anomalias no procedimento.
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