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Effect of AFR on power video

Understanding AFR

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good morning ,

in this video, it is shown that there is not a big change in power between a rich AFR and a lean AFR.

as a tuner what would be the best decision to make if the AFR is not passing the 1 lambda, but in .86 and .90 it is the same amount of power?

Hello for me it would depend on the type of car and what it is used for but generally i play safe and slightly richer

Regards Ross