I always see people speaking of tuning their engines and then burning their newly created files to a chip. What I don't understand is how do you make adjustments to your fuel and timing while tuning? Take for example Uberdata - do you have your laptop connected to the ECU and the Uberdata software overrides the stock ECU chip or is there a special chip you use at the time of tuning to modify your settings and then burn it to your final chip? I don't fully understand. Can someone help me please! I want to understand how I "tune" on the fly then burn the files to a chip. What is the process and what equipment/software is used at what point ? Thanks.