Hi guys, I'm new to this forum. I have been thinking a lot lately about making my ranger bi-fuel. I have the general concept worked out, but I still have a lot of questions. The one I would like to address here is about WBO2 sensors.
If I understand correctly, O2 sensors read the amount of O2 in the exhaust and interpolate that into a voltage which and then be read as an AFR. Will an O2 sensor read fuels besides gasoline accurately? Are AFRs and O2 content in the exhaust consistently converse regardless of the fuel type?
Reading AFR with CNG
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
Reading AFR with CNG
88 Ranger 2.3 turbo
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efahl
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This seems like a good time to get on my podium and rant (again) about relative units versus absolute...
All of you are probably accustomed to tuning using kPa absolute for MAP by now, as opposed to inches/Hg and psig. Well, I've always thought (and said several times in the past) that we should all stop using AFR to measure mixtures and use the unitless lambda. What is the stoichiometric mixture for gasoline? "14.7 AFR" I hear shouted out by the hordes, but indeed that's pretty rare. Usually it's closer to 14.2, but it is different for every batch of fuel that the oil companies mix up. What's stoich with E15, E85, CNG, et cetera? Puzzlement ensues.
I can assure you, though, that when you read lambda = 1.0, you have a stoichiometric mix. Ditch your AFR gauge and replace it with a lambda gauge and you'll never have to worry about AFR again (I jest, of course, you will need to know an approximate mass ratio for calibrating required fuel). The "LED bar" on the front page of MegaTune is a lambda gauge of sorts, with the center being 1.0, so you all are probably fairly familiar with it already. If everyone starts using lambda numerically, the world will be a better place.
Eric
All of you are probably accustomed to tuning using kPa absolute for MAP by now, as opposed to inches/Hg and psig. Well, I've always thought (and said several times in the past) that we should all stop using AFR to measure mixtures and use the unitless lambda. What is the stoichiometric mixture for gasoline? "14.7 AFR" I hear shouted out by the hordes, but indeed that's pretty rare. Usually it's closer to 14.2, but it is different for every batch of fuel that the oil companies mix up. What's stoich with E15, E85, CNG, et cetera? Puzzlement ensues.
I can assure you, though, that when you read lambda = 1.0, you have a stoichiometric mix. Ditch your AFR gauge and replace it with a lambda gauge and you'll never have to worry about AFR again (I jest, of course, you will need to know an approximate mass ratio for calibrating required fuel). The "LED bar" on the front page of MegaTune is a lambda gauge of sorts, with the center being 1.0, so you all are probably fairly familiar with it already. If everyone starts using lambda numerically, the world will be a better place.
Eric