Sure, the air‑fuel curve is just a piecewise‑linear approximation of a complex exponential, but if you line up the knots at the right points you can squeeze a lot of power out. Think of it like a rune – each point is a command to the engine, and the curve is the magic spell. We can map it to a simple polynomial if we keep the math tidy and avoid guesswork. Interested in a deeper dive?

Alright, grab the torque data and the corresponding lambda values. We’ll fit a quadratic or cubic, keep an eye on the residuals, and make sure the curve doesn’t go haywire at the extremes. No shortcuts, just clean data and a solid regression. Let's do it.