this post was submitted on 23 Oct 2023
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I read that the FIA keeps an eye on porpoising and that is the reason HAM and LEC got selected for a test. Because a high degree of porpoising might result in high wear on the skid plates. So there is some kind of logic that makes sense there. I guess they had to check at least VER and NOR to make sure their logic held up.
Found the source (in Dutch): https://nl.motorsport.com/f1/news/diskwalificatie-lewis-hamilton-charles-leclerc-gp-amerika-fia-controle-auto-max-verstappen/10536672/
Google translate of relevant section:
For example, the FIA โโinformed this website a little later in the evening that it is making a reasoned decision. "Of course we are not blind to what is happening around us." It means that the FIA โโlooks, among other things, at the so-called porpoising matrix when selecting the cars. This porpoising overview shows the bouncing of the cars, which logically has an effect on the wear of the floorboards. Cars that stand out have a greater chance of being examined more closely than others. For example, the FIA โโhas the impression that Sainz and George Russell drove with a higher ride height than their teammates, which would mean they would be in a good position.
The plank has nothing to do with porpoising. It's been in place since the mid 90's and was instituted to enforce minimum ride height rules after Ayrton Senna's death. The ground effect cars that suffer from porpoising have only been legal for a couple of years.