cars dont need tuning becuase they have a closed loop system and adjust for themselves.
That's true, but not entirely accurate. Most cars do have a closed loop system that makes adjustments as it runs according to the inputs that it receives from it's sensors and the factory map that it has in memory. A closed loop system is mainly used for fuel efficiency and emissions. It is much more productive to run in open loop if you're trying to get HP. Cars have open loop capability but it is used for warm-up, limp-in, and diagnostics. Most new cars now have bi-directional computers in them and that means that they can give output(datastream) and receive input(like Cannondales can). Cars don't tune themselves.....they simply make fuel adjustments within the parameters of their programming(which is usualy mild). If you have the right computer set-up, you can change that programming(map).