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Evo 8 stroker 2.3 with turbo 9 mr and 1.8 bar boost

Understanding AFR

Discussion and questions related to the course Understand AFR


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Any recommendations on target AFR? is a 0.78 lambda fair enough?

You haven't mentioned fuel so it's hard to be too specific. If you're talking about pump gas then 0.78 is a reasonable starting point. Unless the compression ratio has been dropped significantly, you're likely to find that the engine is heavily knock limited at that sort of boost level on pump gas though.

Hello,

Yes gasoline fuel, and the engine pressure is 155!

Is 0.78 considered rich or shall I go richer?

0.78 is not what I'd call excessively rich, however with that particular combination you're likely to notice the power drop away if you go much richer than that so there's little to be gained usually from tuning much richer than this.

0.78 is not what I'd call excessively rich, however with that particular combination you're likely to notice the power drop away if you go much richer than that so there's little to be gained usually from tuning much richer than this.