Ferrari tested a new floor at Suzuka last Friday, but reverted to the older version for Saturday onwards.
The older version (inset) has an L-shaped outer corner slot gap. This allows the air that is displaced by the rear tyre rotating onto the ground to pull on this slot, taking airflow from the top surface of the floor through the slot; and with it, scavenging airflow outwards that would normally be pulled into the diffuser area, reducing the performance of the whole floor.
The new version with the two arrows extends that L-shaped slot inwards. With my limited understanding of how Ferrari’s analysis expects this area to work, I have no idea why you would do this. It will allow more airflow to go inside the rear tyre, which will reduce the diffuser’s performance.
The only positive that could come from this development is a potential reduction in sensitivity to ride-height change. But this reduction will come from a loss at the high ride heights instead of a gain at low ride heights, which overall will be a negative.
PREVIOUS DESIGN USED FOR JAPANESE GP SUZUKA FRIDAY PRACTICE VERSION