When talking about modified cars, one term that gets thrown around a lot is ECU tuning. If done right, it can be really beneficial to your car's performance.

Automotive security specialist by day [P1kachu] hacks his own cars as a hobby in his free time. He recently began to delve into the Engine Control Units (ECUs) of the two old Hondas that he uses to… ...

When talking about modified cars, one term that gets thrown around a lot is ECU tuning. What is it? What sort of effect does it have on performance?