When you “tune” a car, what exactly is it changing?

Question

TIA

In: 639

Answer 1

Well, a few things. I use Holleys ECU in a few cars I built. From there I can completely change my fuel and timing map. I have outputs on it that I can assign to do different things in different conditions. I can adjust my traction control and how it behaves. Boost pressure and how much fuel pressure it needs per the rpm level. So very much you can do with it. I can even do a “Boost by gear” where on lower gears I’ll have lower boost and eventually it ramps up with higher gears so the movement of your car combined with traction control is so much more efficient