Question to the self-mapper among us: AFR target ?

[r.hellenbrand]

Hi,

Normally you should run your engine with lambda 0.90, this is the best value for performance.
But for sure you can only check it on a dyno.
Mine engine needed lambda 0.87 under full load.

When you have a cat you should map lambda 1.00 (in part load).
The reason for this is that the cat only works in a small range around lambda 1.00

A simple rule:
For performance you need lambda 0.90 and for economics you should map lambda 1.10.
Full load, best performance between 0.90 – 0.88.

I hope this helps.

Ron