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Tuner Richened Up My Target AFR

Understanding AFR

Discussion and questions related to the course Understand AFR


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Hey Guys i played around with target AFR table and had the NA part of the map and transistion alot lighter on fuel, now when we went to the dyno my tuner changed it on me, just after a 2nd opinion, motor is a 370ci Iron LS with a Billet wheel 80mm turbo

i just feel that the NA part of the map could be snappier

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You're right, the off boost and low load AFR targets are probably a little richer than you need to run for your combination. I doubt you would be giving up any power or response from those target AFRs, but they wouldn't help economy.

It really comes down to what you want to use the car for (and from what I know, it's mainly for the track). If it was a street car, I'd be focussing on a nice lean cruise around 1.00 lambda, and a leaner transition onto boost - This will pay off with improved fuel economy. If it's only ever going to see the strip though, you can almost ignore anything that isn't idle or full power.

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