You almost sounds like you're gettin up in my grill....
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I'm not sure what "it" he's referring to.
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I thought the "it" was very obvious.
His use of the english language wasn't too precise, but I could tell from the context of his post that he was refering to the fact that narrow band O2 sensors only sense stoichiometric crossover, so that's the only data-point they can deliver within the entire spectrum of possible air/fuel ratios, while today's wide band O2 sensor controllers can deliver continuously sensed air/fuel ratio from 0 percent O2 all the way to 21 percent (atmospheric content).
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Also, You should note that your numbers refer to naturally aspirated engines. Forced induction engines require richer numbers, unless you run E85.
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Are you talking to me?
Why on earth are you even bringing up forced induction or E85? Is this still a Ninja 250 website? I'm pretty sure the EX-250 isn't an E85 vehicle, and as for forced induction aren't we all aware of the train wreck of a thread currently in progress on this exact same sub-forum titled "turbo / turbocharger / turbocharging." Nuff said about that, right?
Yes, I'm aware that different fuel types have different stoichiometric ratios. For example: E85 is 9.87:1, propane 15.7:1, methanol 6.47:1, LPG 15.5:1, and so on.... But how does that apply to a pump-gas burning EX-250?