Once the areas of focus have been defined, the general process of bringing an upgrade to the track will depend on the component, but whether it's an internal or external part, they all need to be designed and tested, before the decision is made to move forward with the concept or find another solution.
If we take an aero part as an example, the Aerodynamics department will come up with a range of concepts and solutions, which will then be designed and tested in Computational Fluid Dynamics (CFD) simulations. The best options will be turned into components for the Wind Tunnel model, where they'll be trialled in the Tunnel, before the final solution is given the green light to be manufactured and brought to the track. This entire process can take several weeks, which is why planning the upgrades and creating a solid development timeline is so important.
Many of the innovative designs can't be seen on TV, but instead lie under the bodywork of the car, such as the gearbox or cooling systems. Often, what we find here are lots of small things, which are easy to implement and can be introduced between the main upgrades.
One of the most interesting internal areas to upgrade is the engine, as all the action happens in the combustion chambers. Engineers can create and bring numerous updates to the engine, but from the outside, it's hardly noticeable.
That was true for the DAS steering system that we developed for 2020, which was only visible because the drivers moved the steering wheel backwards and forwards, bringing to life an innovation that would have otherwise been invisible to the outside world.