F1 Racing is the most technically advanced racing out there. More money and more technology is thrown at winning that any other racing. Back in the early 90s working at Microsoft there were a bunch of us who would get together at somebody’s house at 6a Sunday morning to watch the European F1 races. One guy was so into F1, he quit Microsoft and joined the Ferrari race team to work on the computer systems in the cars.
McLaren racing dumped Mercedes engines for Honda in the 2015 season, and part of the reason is McLaren wanted the source for the engine systems.
"A modern grand prix engine at this moment in time is not just about sheer power; it's about how you harvest the energy, store the energy and effectively if you don't have control of that process - meaning access to source code - then you are not going to be able to stabilise your car in the entry to corners, for instance, and you lose lots of lap time. So even though you have the same brand of engine you do not have the ability to optimise the engine."
I have been out of following F1, but 2015 might be when I start following again. Here is a Honda video they released on their 2015 engine. Honda has bet on one team McLaren to win. Which means they’ll be sharing everything they can to get the most performance out of their engine.