Microtech How precise is the A/F reading?
#1
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How precise is the A/F reading?
How precise is the A/F reading on the screen, with a narrow band oxygen sensor connected?
Could it be used for tuning, or is it just a "fun" onscreen function?
Could it be used for tuning, or is it just a "fun" onscreen function?
#2
Compression Tester Guy
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A narrow band O2 will tell you if you are lean, or rich...but it will not tell you by how much. I would never use one to tune a rotary. I'm an old Megasquirt guy, so here's a clip and pic from the MS manual that I like to refer to.
With a narrow band sensor, we can really only tell for certain whether we are rich or lean, but not by how much. If you look at the graph, you can see that for a narrow band sensor, the 12.5:1 AFR required for maximum power can give O2 voltage from 0.8 to 0.95 (depending on exhaust gas temperature), yet this same range of O2 voltages can indicate mixtures from 10:1 to 14.5:1. So we cannot use it reliably to set mixtures for full power. With a wide-band sensor, 12.5:1 corresponds to 2.08 volts, and 2.08 volts means 12.5:1. Thus there is no ambiguity over AFR and voltages. We can measure any mixture in the range we are likely to use, from full power through to maximum economy.
http://www.msefi.com/msinfo/manual/wbvolts.gif
Hope this helps!
-John
With a narrow band sensor, we can really only tell for certain whether we are rich or lean, but not by how much. If you look at the graph, you can see that for a narrow band sensor, the 12.5:1 AFR required for maximum power can give O2 voltage from 0.8 to 0.95 (depending on exhaust gas temperature), yet this same range of O2 voltages can indicate mixtures from 10:1 to 14.5:1. So we cannot use it reliably to set mixtures for full power. With a wide-band sensor, 12.5:1 corresponds to 2.08 volts, and 2.08 volts means 12.5:1. Thus there is no ambiguity over AFR and voltages. We can measure any mixture in the range we are likely to use, from full power through to maximum economy.
http://www.msefi.com/msinfo/manual/wbvolts.gif
Hope this helps!
-John
#6
Originally Posted by TwistedRotors
No problem, glad I could help!
Now I'll shamelessly plug my favorite wideband company: Innovate Motorsports! Check out www.innovatemotorsports.com! ;-)
-John
Now I'll shamelessly plug my favorite wideband company: Innovate Motorsports! Check out www.innovatemotorsports.com! ;-)
-John
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#8
Rotary Enthusiast
Originally Posted by GUITARJUNKIE28
even the wideband on the microtech isn't very accurate.
the last one i did was a FULL point off!!!
the last one i did was a FULL point off!!!
#12
Rotary Enthusiast
dont have to free air calabrate as such like the innovative,
just install the sensor in the bottom of the dump pipe not directly behind the turbo, these 6066 sensor do not like heat, if you get them hot they will not read well at all
Dale
just install the sensor in the bottom of the dump pipe not directly behind the turbo, these 6066 sensor do not like heat, if you get them hot they will not read well at all
Dale
#14
controlled kaos
iTrader: (3)
quick question guy's my.. lt12 calls for a lsm11 wb o2 I believe, those run 275 if I'm not mistaken.. and I see that you can find what you call the 6066 sensors for cheap. can these 6066/7057 sensors be run in my lt12 as well... cheaper is better only if they work well...
#16
Rotary Enthusiast
Originally Posted by astrochild7
quick question guy's my.. lt12 calls for a lsm11 wb o2 I believe, those run 275 if I'm not mistaken.. and I see that you can find what you call the 6066 sensors for cheap. can these 6066/7057 sensors be run in my lt12 as well... cheaper is better only if they work well...
Dale
#22
Rotary Enthusiast
iTrader: (1)
Originally Posted by GUITARJUNKIE28
as far as possible.
#24
Needs more cow bell
iTrader: (2)
I run my wideband about 6 inches from the end of the pipe and at idle the readings are all screwed up (bridgeport) but with the loud pedal down it reads just fine. Ive installed it farther upstream to be able to compare the results. I keep it farther back and the sensors last longer.
#25
Rotary Enthusiast
another thing with the LSU4 is they hate leaded fuel by the look of it, my sensor was only a few months old and had done a fair bit of race gas work and it is now reading wacko! replaced it with a new one and it was perfect again,
i would reccomend 20hours tops if using leaded race fuel
dale
i would reccomend 20hours tops if using leaded race fuel
dale
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