i woudln't go above 16. if its getting that high you need to click the check mark to enable "adjust all tables" and add at least 10%-15% fuel if not more. roughly 10% fuel is 1 afr. eg, if you're hitting 16.3AFR, if you add 10% the rule of thumb is you should see ~15.3AFR. you want to see about 12.1-13.1 AFR on WOT. the lower afr is usually where you're just using fuel to cool the combustion when you're going forced induction. so if you're n/a you want to (usually) be a little higher. it all depends on what engine it is and mostly wont be able to notice without a dyno. if y our using a k20 map your going to need to add about 15% over everything to make up for the engine size (k24 is 16.66% bigger than k20) and flow. heres a lesson, its better to run rich, so fatten up that fuel and pull back and lean it out to where its safe. dont run it lean trying to make it rich. you are more likely to blow the engine running lean 10 times than you are running it rich 1000 times.
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