It was happening on the RPs in Austria at times, though I can't recall now which turn(s) it was.
That's what they call 'overfill', happens a little bit on the start line, or just before formation lap.
In Austria the RPs were puffing lap after lap out of turn 1 and 8/9 in all sessions.
It did not go unnoticed, plenty of punters in the thread here were commenting about it.
In Austria, it seemed as though it was only Perez, and occasionally the Mercedes of Bottas doing it. Largely from Turn 1, Turn 3 also.
However, in Hungary, all the Merc engine cars did it from Turn 1. If it's unburned "something", then that's also going through the Turbo . The proverbial "afterburner" mode you might say. Engines need help at low RPM. Could be related to getting better turbo spool, so less energy used from the battery pack to spin up the MGU-H at low RPM. Just wild guessing at this point. The smoke only appears out of the low speed corner exits so they are clearly running the engine to different parameters to generate the smoke at that time.
Edited by ARTGP, 27 July 2020 - 05:42.