Lambda Vs. Torque Vs. Ignition Timing

I will try to word this question the best I can. On the Lambda vs. Torque scale (at a steady load), will the peak torque shift, at what lambda value it is achieved, if you advance and retard ignition timing?

i'm not sure what you're asking, as there are several directly contradictory parts to your question.

If the engine is loaded, such as on a dyno', at a fixed rpm the torque would be expected to alter if the lambda (fuel mixture/AFR) and/or the ignition timing is changed.

Normally the ignition timing used is the one that gives best torque, just as the lamda used is usually the one that gives best torque.

However, there can be other factors that limit the timing, such as too much cylinder pressure for the fuel to prevent detonation and/or pre-ignition, or exhaust gas temperatures may require a richer mixture to lower them.

As you may gather, ignition and fuelling mixtures need to be established over the operating range of the engine, and for different loads/amount of throttle/boost the engine is experiencing.

Thank you for the response, and I apologize for the poorly worded question.

Basically I was watching the part of the lesson where the instructor had the 350z at a steady RPM at WOT with the dyno loading the car to keep it steady. He had a graph that showed torque output and how it would go down if lambda was too high or too low. It showed that at one lambda value, around .95 I believe, it made the most torque.

My question was given that representation, would the best AFR for maximum torque change if you advanced or retarded the ignition timing? And I believe your response answered that well.

Yes it would change, but the reason for change is a multitude of factors including cylinder temp, detonation, etc.

Thank you,

-Zane