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Post by sparky on Apr 24, 2013 12:00:14 GMT -6
Ok so I came up with this idea a while back. I think the most popular questions on here have to do with jetting. So how can we make it easier? And here came my idea. I've had a few guys to bounce the idea off of. And we came up with this. I hope you all like the idea.
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Post by sparky on Apr 24, 2013 12:07:54 GMT -6
So a little explanation: Most of us have heard of oxygen sensors, right? An oxygen sensor reads the exhaust gasses coming out of an engine. Through this little device your fuel injected engine know what the fuel/air mixture of the engine is, and adjusts the fuel accordingly. So I know we have neither on our bikes.(yet)!
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Post by sparky on Apr 24, 2013 12:16:29 GMT -6
To understand the sensor you need to know how it works. Oh and I will be talking about narrow band sensors. This little sensor is stuck in the exhaust gasses coming out of your engines. It outputs a very small voltage that the ECM reads. Since we do not have ECMs we just want to know this voltage, as it dictates the fuel mixture. Super simple design. You could use a nice high end O2 sensor reader of course, but it's not near as fun. You could use high end none loading Multimeter but the scale fluctuates to fast for practice application.
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Post by sparky on Apr 24, 2013 12:19:03 GMT -6
So in comes my little Altoids can. It's a classic!! What I have built is a device that will read the output voltage(0-1VDC) of the sensor. The readout is on a 10 segment LED.
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Post by sparky on Apr 24, 2013 12:27:42 GMT -6
On to sensors. They can be had cheap on eBay. Got mine for $10. There are many types to choose from. 1 wire- the sensor circuit is sensor body/ and wire 2 wire- the sensor circuit is the two wires. 4 wire- (which I chose) grey and black are the sensor circuits, two white wires are the element heater. There may be more not sure. The reason I chose the sensor with the heater. The tip of the sensor needs to reach high temps(600f+) if I remember correctly. By using one with a heater you can speed up the accuracy point and reaction time. Oh and mount it farther back in your pipe.
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Post by sparky on Apr 24, 2013 12:33:52 GMT -6
The circuit is fairly simple. I do plan on building a few. Still working on ideas for where to mount the sensor. I'm thinking on welding a bung in my muffler pipe to mount it, not sure yet. I think a removable cone at the tip of the muffler would be cool.
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Post by sparky on Apr 24, 2013 12:37:39 GMT -6
So once you get the sensor mounted. How do you use it? I believe you could use this at idle to set mixture screw/ pilot jet. Mid range for needle. WOT for main jet. If you mod your bike just hook it up again to check jetting. Thoughts???
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Post by gen1pat on Apr 24, 2013 14:32:50 GMT -6
I've seen these in ricers before. Neat concept. I'd be curious to see how it will work in a quad. You will want to mount the 02 in the header, probably around the clutch cover area.
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Post by 94warpig on Apr 24, 2013 14:34:52 GMT -6
If you could get this all to work that would be boss! Something real to go from when jetting. Your one smart mofo!
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Post by Goody's Atv on Apr 24, 2013 14:37:14 GMT -6
Good to see it finally coming together
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Post by MudBug on Apr 24, 2013 14:39:37 GMT -6
I've seen these in ricers before. Neat concept. I'd be curious to see how it will work in a quad. You will want to mount the 02 in the header, probably around the clutch cover area. Should be no need to mount pertinently, the muffle should be hot enough to get good readings from to just get tuning readings. But on the other hand Josh and I have talked about welding a bung in the header to put the 02 sensor in while tuning and using a plug when not tuning. I believe that will be the direction I go in with mine.
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Post by Goody's Atv on Apr 24, 2013 14:42:33 GMT -6
I was gonna weld a bung in my powerbomb
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Post by sparky on Apr 25, 2013 0:35:26 GMT -6
Not real smart just lots of idle time lol
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Post by sparky on Apr 25, 2013 0:37:36 GMT -6
Pat, would the heater circuit not hear the tip hot enough to get accurate measurements later in the pipe? Just wondering? I can't really try it out here.
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Post by gen1pat on Apr 25, 2013 19:27:59 GMT -6
I would put it in the header instead of the muffler because you are getting a reading from the more raw exhaust gasses. The muffler will reduce the emissions some. That is why they put 02 sensors before and after the catalytic coverter. The cat helps to reduce emissions (as does the muffler, but the cat more so) so they need a reading from before the cat, and after the cat. May not mean a whole lot in an ATV application, but, that is where I would put it.
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